Patton electronic Network Card 2500RC User Manual

USER  
MANUAL  
MODEL 2500RC Series  
Models 2500RC, 2510RC  
and 2520RC:  
All-Rate CSU/DSU  
Rack Mount Card  
SALES OFFICE  
(301) 975-1000  
TECHNICAL SUPPORT  
(301) 975-1007  
Part# 07M2500RC--D  
Doc# 099011UD  
Revised 3/19/97  
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An ISO-9001  
Certified Company  
 
1.2 FCC INFORMATION  
1.4 SERVICE  
All warranty and nonwarranty repairs must be returned freight  
prepaid and insured to Patton Electronics. All returns must have a  
Return Materials Authorization number on the outside of the shipping  
container. This number may be obtained from Patton Electronics  
Technical Support: (301) 975-1007; http://www.patton.com; or,  
The Model 2500 Series has been tested and registered in  
compliance with the specifications in Part 68 of the FCC rules. A label  
on the equipment bears the FCC registration number. You may be  
requested to provide this information to your telephone company.  
Your telephone company may make changes in its facilities,  
equipment, operations or procedures that could affect the proper  
operation of the Model 2500 Series. If this happens, the telephone  
company should give you advance notice to prevent the interruption of  
your service.  
Notice: Packages received without an RMA number will not be  
accepted.  
The telephone company may decide to temporarily discontinue  
your service if they believe your Model 2500 Series may cause harm to  
the telephone network. Whenever possible, they will contact you in  
advance. If you elect to do so, you have the right to file a complaint  
with the FCC.  
Patton Electronics' technical staff is also available to answer any  
questions that might arise concerning the installation or use of your  
Patton Model 2500RC. Technical Service hours: 8AM to 5PM EST,  
Monday through Friday.  
If you have any trouble operating the Model 2500 Series, please  
contact Patton Technical Support at (301) 975-1000. The telephone  
company may ask you to disconnect the equipment from the telephone  
network until the problem has been corrected or until you are certain  
that the Model 2500 Series is not malfunctioning.  
The following information may be required when applying to your  
local telephone company for leased line facilities:  
Service  
Digital Facility Service Order Network  
Type  
Interface Code  
04DU5-24  
04DU5-48  
04DU5-96  
04DU5-56  
Code  
6.0F  
6.0F  
6.0F  
6.0F  
Jacks  
RJ48S  
RJ48S  
RJ48S  
RJ48S  
2.4 Kbps Digital Interface  
4.8 Kbps Digital Interface  
9.6 Kbps Digital Interface  
56 Kbps Digital Interface  
NOTE: As of this publication date, 19.2 and 64Kbps digital  
services have not been assigned Digital Facility Interface Codes.  
1.3 CE NOTICE  
The CE symbol on your Patton Electronics equipment indicates  
that it is in compliance with the Electromagnetic Compatibility (EMC)  
directive and the Low Voltage Directive (LVD) of the Union European  
(EU). A Certificate of Compliance is available by contacting Technical  
Support.  
3
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2.0 GENERAL INFORMATION  
2.3 SUPPORTED APPLICATIONS  
Thank you for your purchase of this Patton Electronics product.  
This product has been thoroughly inspected and tested and is  
warranted for One Year parts and labor. If any questions arise during  
installation or use of the unit, contact Patton Electronics Technical  
Support: (301) 975-1007; http://www.patton.com; or,  
The Model 2500RC Series includes three units: the Model 2500RC  
All-Rate CSU/DSU, the Model 2510RC Switched 56 CSU/DSU and the  
Model 2520RC All-Rate/Switched 56 CSU/DSU. Depending upon the  
unit selected, the Mode 2500RC Series supports three distinct modes  
of operation. These are outlined in the descriptions and table below:  
Dedicated DDS/Clear Channel Operation (Models 2500RC, 2520RC)  
The unit can be easily configured for dedicated DDS/Clear Channel  
operation by means of the dip switches on the bottom of the enclosure,  
or by means of the software control port. Set the Line Rate to match  
the rate of service to which you subscribe. Set the Mode switches for  
Network Clocking. The Rate Converter and the Data Format options  
should be set as required for your application. The remaining options  
may need to be set depending on your terminal equipment and your  
application.  
2.1 PRODUCT FEATURES  
• Operates over 4-wire dedicated digital lines  
• Supports rates of 56 Kbps and 64 Kbps and all sub rates  
• Supports Switched 56 dialing  
• Both RS-232 and V.35 rear interface cards available  
• Features V.52 and V.54 compliant tests  
• Nine easy-to-read LED indicators to monitor data signals  
• Internal, external or received loopback clocking  
• AT&T 62310 compliant  
Switched-56 Operation (Models 2510RC, 2520RC)  
The unit can be used in Switched 56 applications. Set the Line  
Rate to 56 Kbps. Set the Mode switches for Switched 56, and enable  
Force RTS and Circuit Assurance. Dial or store a number using the  
control port. The Rate Converter and the Data Format options should  
be set as required for your application. The remaining options may  
need to be set depending on your terminal equipment and your  
application.  
• Can be used as a high speed modem for private twisted pair  
• Fits in Patton’s rack chassis and Cluster Boxes  
• Made in the USA  
Campus Area Short Haul Operation (Models 2500RC, 2520RC)  
2.2 GENERAL PRODUCT DESCRIPTION  
The unit can also be used for campus area point-to-point short-haul  
applications on private twisted-pair wires. Set the Line Rates the same  
on both units. Set the Mode switch for the appropriate Transmit Clock  
Mode for your application. Internal, External and Looped Clock Modes  
are available. Set the remaining options as needed by your terminal  
equipment or your application.  
The Model 2500RC Series CSU/DSUs operate either  
synchronously or asynchronously over 4-wire circuits up to 64 Kbps.  
Rate conversion allows operation with a variety of DTE devices.  
Diagnostics include V.54 and V.52 loopback tests, as well as CSU  
loops. Configuration is accomplished by either internal DIP switches or  
RS-232 software switches (user provides terminal). Nine easy-to-read  
function card LED indicators monitor data and control signals. Two rear  
interface cards are available: DB-25 and RJ-48 or M/34 and RJ-48.  
MODEL 2500RC SERIES APPLICATIONS  
2500RC  
2510RC  
2520RC  
Line Rate Switches  
Mode Switches  
All line rates  
Supported  
56 Kbps only  
All line rates  
Supported  
The Model 2500RC Series is AT&T compliant and supports DDS,  
Switched 56, Clear Channel 64 and other digital services available from  
major service providers including AT&T, Sprint and MCI. Dedicated  
models can also be used as a high speed modem for private twisted  
pair. The Model 2500RC Series is available in standalone or in rack-  
card versions (only rack card versions are covered in this manual).  
Supports all modes Switched 56 only  
except Sw-56  
All modes  
Supported  
Dialing  
Commands  
Not Supported  
Supported  
Supported  
5
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3.0 CONFIGURATION  
3.1.1 Switch Set “S1”  
Before you can install and operate your Model 2500RC Series  
CSU/DSU, you must configure both the front and rear cards. The  
Model 2500RC Series has two sets of eight switches (S1 and S2), a  
reversible interface driver board and two Rotary Address switches  
(MSD and LSD). The 2500RC also has software switches which may  
be configured with the Patton Model 1000CC control card (not  
supplied), using a VT-100 type RS-232 terminal. Rear card  
configuration is accomplished by means of hardware straps.  
The configuration switches on switch set S1 allow you to specify  
Line Rate, Circuit Assurance, RTS, Character Length, Data Format and  
DSR Loop Status. The table below summarizes S1 switch settings,  
including the factory defaults. Following the table are descriptions of  
each switch setting.  
SWITCH SET S1 SUMMARY TABLE  
3.1 FRONT CARD CONFIGURATION - HARDWARE SWITCHES  
Position  
S1-1  
S1-2  
S1-3  
S1-4  
S1-5  
S1-6  
S1-7  
S1-8  
Function  
Line Rate  
Factory Default  
Exceptions  
The Model 2500RC Series front card defaults to the use of  
hardware switches for configuration. Hardware switches consist of  
two eight-position DIP switches, and two rotary switches (see Figure 1,  
below).  
Off  
56,000 bps  
On  
Line Rate  
}
Line Rate  
On  
Circuit Assurance  
RTS  
Off Disabled  
Off Forced On  
Off 10-Bit  
Model 2510:Enabled  
Rotary Address  
Switches  
Interface  
Driver  
Board  
LSD  
MSD  
Character Length  
Data Format  
DSR Loop Status  
Off Synchronous  
Off DSR Off  
Switches S1-1. S1-2 and S1-3: Line Rate  
SW2  
SW1  
These switches control the signalling rate on the line or RJ-48S  
port of the unit. They should be set to match the speed of your digital  
service.  
FRONT THIS SIDE UP FOR V.35  
S1-1  
On  
On  
On  
On  
Off  
Off  
Off  
S1-2  
On  
On  
Off  
Off  
On  
On  
Off  
S1-3  
On  
Setting  
2.4 Kbps  
4.8 Kbps  
9.6 Kbps  
19.2 Kbps  
56 Kbps  
64 Kbps  
Force configuration  
pointer to default to  
Hardware Switches  
(See Section 3.2)  
Off  
On  
Off  
On  
Off  
Off  
Figure 1. Model 2500RC Series front card, showing location of switches  
The two sets of DIP switches on the Model 2500 Series are referred to  
as S1, S2. As Figure 2 shows, the orientation of all DIP switches is the  
same with respect to “ON” and “OFF” positions.  
ON  
ON  
For line rates of 56 and 64 kbps, it is possible to operate the DTE  
interface at a lower rate. To do this, set these switches to 56 or 64 kbps  
and set the Rate Converter/DTE Rate switches as required.  
1
2
3
4
5
6
7
8
OFF  
Figure 2. Close up of DIP switches showing ON/OFF positions.  
NOTE: The ON position is oriented toward the front of the Model 1092RC.  
7
8
 
Switch S1-4: Circuit Assurance  
Switch S1-7: Data Format  
The transmitter and the CTS output can be configured to go On  
only when a working communication circuit is established. If Circuit  
Assurance is used, enable it on only one end of the communication link.  
Circuit Assurance should be enabled in Switched 56 mode.  
The data format selection controls whether an async-to-sync  
conversion is performed.  
S1-7  
On  
Data Format  
Asynchronous  
Synchronous  
Circuit  
Off  
S1-4  
On  
Assurance  
Enabled  
Description  
CTS will go low and the transmitter  
will be held off if the receiver is in  
the No Signal state or CD is low  
The transmitter and CTS will  
operate without regard to the  
receiver state  
Switch S1-8: DSR System Status  
Off  
Disabled  
The behavior of the DSR output during performance of a local loop  
can be controlled.  
DSR  
S1-8  
On  
Loop Status  
DSR On  
Description  
DSR remains high (On) during the  
Analog Loop  
Switch S1-5: RTS  
The RTS input can be forced on, ignoring the terminal’s RTS  
signal. RTS controls the transmitter by either sending the user’s data  
or sending an idle code.  
Off  
DSR Off  
DSR goes low (Off) during the  
Analog Loop  
3.1.2 Switch Set “S2”  
S1-5  
Off  
RTS  
Forced On  
Description  
An On (high) condition is trans-  
mitted regardless of the state of  
this unit’s RTS input  
The configuration switches on switch S2 control the Rate  
Adapter/DTE Rate, Clock Mode, Anti-Stream Timer and RTS/CTS  
Delay. The table below shows factory default settings for Switch S2.  
Following the table are descriptions of each switch setting.  
On  
Follows DTE The RTS input controls the  
transmitter  
SWITCH SET S2 SUMMARY TABLE  
Switch S1-6: Character Length  
Position  
S2-1  
S2-2  
S2-3  
S2-4  
S2-5  
S2-6  
S2-7  
S2-8  
Function  
Rate Adapter  
Rate Adapter  
Rate Adapter  
DTE Loop Control  
Clock Mode  
Factory Default  
Exceptions  
Off  
In asynchronous data format, 10 and 11 bit characters are  
supported. This setting is ignored in synchronous data format.  
DTE Rate  
Off  
}
Off  
Character  
Length  
10-bit  
Character Description  
Off Disabled  
S1-6  
Off  
Start  
Data bits  
Parity  
None  
1
Stop bits  
1
1
1
8
7
7
1 or more  
1 or more  
2
Off  
Off  
Off  
On  
Network  
Clock  
Model 2510  
Switched 56  
}
}
Clock Mode  
None  
Anti-Stream Timer  
RTS/CTS Delay  
On Disabled  
On  
11-bit  
1
1
8
9
1
1 or more  
1 or more  
Off Normal  
None  
9
10  
 
Switches S2-1, S2-2 and S2-3: Rate Adapter/DTE Rate  
Switch S2-7: Anti-Stream Timer  
The Model 2500RC Series includes a rate adapter that allows the  
unit to be used with DTE devices that support rates lower than 56/64  
kbps. All switch settings below are valid for line rates of 56 or 64 kbps.  
The anti-stream timer protects multidrop networks from a drop that  
is continuously transmitting. If the terminal keeps RTS raised for more  
than 30 seconds, the timer forces RTS off internally. This allows the  
rest of the multidrop network to resume operation. The CSU/DSU  
remains in the forced-off condition until the terminal drops RTS.  
S2-1  
On  
Off  
On  
Off  
On  
Off  
S2-2  
On  
On  
Off  
Off  
On  
Off  
S2-3  
On  
On  
On  
On  
Off  
Off  
DTE Rate  
2.4 kbps  
4.8 kbps  
9.6 kbps  
19.2 kbps  
Timer Value in Sec at Various Line Rates  
S2-7  
On  
Off  
Timer  
Disabled  
Enabled  
56  
19.2  
9.6  
4.8  
2.4  
2
4
8
15  
30  
38.4 kbps  
Line Rate = DTE Rate  
Switch S2-8: RTS/CTS Delay  
NOTE: for DTE devices that operate at 57.6 kbps, set the Line  
Rate to 56 kbps (see Section 3.1.1 4.1.1), set the rate adapter for  
“Line Rate=DTE Rate”, and configure your DTE device for two  
stop bits (set character length accordingly).  
The RTS/CTS turn-on delay can be set to Normal or Extended.  
Delay in mSec at Various Line Rates  
S2-8  
Off  
CTS Delay  
Normal  
56  
0.3  
1.3  
19.2  
0.9  
3.8  
9.6  
1.9  
7.5  
4.8  
3.8  
15  
2.4  
7.5  
30  
Switch S2-4: DTE Loop Control  
On  
Extended  
The local loop and remote loop can be activated from the DTE  
interface using signals “LL” and “RL”.  
3.1.3 Setting the Reversible Interface Driver Board  
The Model 2500RC Series supports both RS-232 and V.35  
S2-4  
electrical interfaces for the terminal connection port. Which electrical  
interface is active is determined by the orientation of the small  
reversible daughter board on the front card (see Figure 3, below). The  
daughter board is clearly marked “THIS SIDE UP FOR RS-232” and  
“THIS SIDE UP FOR V.35”. Note: When plugging the daughter board  
into the socket, the arrow should always point toward the front of the  
PC board.  
On  
Off  
Enable LL and RL inputs  
Disable  
Switches S2-5 and S2-6: Clock Mode  
The appropriate transmitter clocking modes can be selected for  
Dedicated DDS, Switched-56 or campus-area (private) operation.  
S2-5  
On  
S2-6  
Off  
Mode  
External Clock Mode Transmit Clock  
derived from terminal  
Description  
Interface  
Driver  
Board  
interface  
Network Clock Mode Transmit clock derived  
(Looped Clock Mode) from the received line  
signal; Use this mode  
Off  
Off  
FRONT  
THIS SIDE UP FOR V.35  
for Dedicated DDS  
operation  
On  
Off  
On  
On  
Internal Clock Mode  
Switched 56  
Transmit Clock  
derived internally  
(Model 2510, 2520)  
Figure 3. Closeup of Model 2500RC Interface Driver Board  
11  
12  
 
3.1.4 Setting Rotary Address Switches  
2. Power up the terminal and set its RS-232C port as follows:  
9600 baud  
8 data bits, 1 stop bit, no parity  
local echo  
CR = CR/LF on inbound data  
ANSI, VT-100 emulation  
If you plan to use the software control port to configure or dial the  
Model 2500RC Series unit, you will need to configure each front card  
with a unique address. This is done by using a small screw driver to  
set the two rotary switches, as shown in Figure 4, below. The switches  
are set individually for a number from 0 - 9, forming a two digit address  
(00 - 98). Software commands set to a particular address will be  
recognized by the card with that address, and ignored by other cards.  
3. Press [CTRL+B] on the terminal, then enter the address of the  
card you wish to configure (see Section 3.1.4), and press  
[RETURN]. (Note: Do not use the universal address [99].  
Configure only one card at a time.) The Model 2500RC Series  
Main Menu should then display on the terminal screen (see  
below).  
Note: Address “99” is universal. All units respond to address “99”  
no matter how the rotary switches are set.  
Rotary Address  
Switches  
LSD  
MSD  
Figure 4. Setting the rotary address switches  
3.2 FRONT CARD CONFIGURATION - SOFTWARE SWITCHES  
The Model 2500RC Series has an internal control port that allows  
software configuration. Control port signals are carried to each card in  
the rack along the power bus board inside the rack chassis. Access to  
all rack card control ports is provided by a single Patton Model 1000CC  
control card. For instructions on installation and use of the Model  
1000CC, please refer to the Model 1000CC User Manual.  
3.2.2 Using the Software Menu System  
The Model 2500RC Series Menu System operates as follows:  
1
2
All selections must be followed by [RETURN].  
To make a selection from any menu, enter the option number  
at the prompt and press [RETURN].  
3.2.1 Accessing the Software Control Port  
Once you have set each Model 2500RC’s address (see Section  
3.1.4), plugged each front card into the rack chassis (see Section 4.0),  
and properly installed the Model 1000CC control card (see Model  
1000CC User Manual), you are ready to access the Model 2500RC  
Series Main Menu. Follow these steps:  
3.  
To exit any menu without making a selection, press [ESC]  
followed by [RETURN]. (Note: You can also exit by just  
pressing [RETURN]. However, doing this in the Store Phone  
Number Menu will clear the buffer of the currently stored  
number.)  
1. Connect the serial RS-232C port of a VT100 terminal (or  
similar RS-232 DTE with terminal emulation) to the EIA-561  
control port on the Model 1000CC control card.  
13  
14  
 
3.2.3 Verifying Software Switch Control  
For each screen described below, selecting a numbered option and  
pressing [RETURN] stores that option setting and returns you to the  
Software Switch Menu (Note: All lettered options must be entered in  
lower case)  
In order to use software switches for configuration, it is necessary  
to disable the hardware switch settings. To do this, use the following  
procedure (Note: If this procedure is omitted, your software  
configurations will be overridden by the hardware switch settings):  
Line Rate  
Choosing option 1 in the Software Switch Menu takes you to the  
Line Rate Menu (below). This option controls the signaling rate on the  
line. Set it to match the speed of your digital service. For line rates of  
56 or 64 Kbps, it is possible to operate the DTE interface at a lower  
rate. To do this , set the line rate to 56 or 64 Kbps. Then set the DTE  
Speed as required (Software Switch Menu option 7).  
1. On the Main Menu (opposite page), choose item 1, “Select  
Hardware/Software Switch Control”. The following screen will  
appear:  
2. In the Hardware/Software Control Menu, select item 2 to  
enable software switch control.  
3. The Main Menu will automatically reappear after your selection  
is entered.  
Circuit Assurance  
3.2.4 Setting Software Switch Parameters  
Choosing option 2 in the Software Switch Menu takes you to the  
Circuit Assurance Menu (below). On dedicated (DDS) circuits, the  
transmitter and the CTS output can be configured to go ON only when  
a working communication circuit is established. If you use Circuit  
Assurance with DDS services, enable it on only one end of the  
communication link. For Switched-56 service, enable Circuit Assurance  
on both ends of the circuit. When Circuit Assurance is disabled, the  
transmitter and CTS operate without regard to the receiver state.  
From the Main Menu, selecting item 3, “Set Software Switch  
Parameters” will take you to the Software Switch Menu (below). From  
this screen, you can soft configure the 2500RC parameters.  
15  
16  
 
Force RTS  
Choosing option 3 in the Software Switch Menu takes you to the  
RTS Menu (below). The RTS input can be forced ON, ignoring the RTS  
signal from the DTE. When RTS is forced ON, the transmitter is always  
enabled and the user may send data. On a Model 2510RC or 2520RC,  
RTS should be forced ON for Switched-56 operation.  
DTE Data Format  
Choosing option 5 in the Software Switch Menu takes you to the  
Data Format Menu (below). This option controls whether an async-to-  
sync conversion is performed between the DTE and the Model 2500RC  
Series. (Data is always transferred synchronously between two Model  
2500RC Series units.) For an asynchronous DTE, select the  
asynchronous data format1,2; for a synchronous DTE, select the  
synchronous data format.  
NOTE: When the Line Rate (Software Switch Menu option 1) is 64  
Kbps, RTS is always forced ON, regardless of the Force RTS  
switch setting.  
NOTE1: The async rate of 57.6 kbps is supported at the 56 kbps  
line rate, provided the DTE equipment is configured to transmit two  
stop bits. The extra stop bit reduces the DTE’s effective data rate  
to allow synchronization with the 56 kbps line speed. Set the  
Model 2500RC Series for two stop bits by selecting “11 bit  
character length” in the Character Length Menu.  
Character Length  
Choosing option 4 in the Software Switch Menu takes you to the  
Character Length Menu (below). In asynchronous data format, the  
Model 2500RC Series supports 10-bit and 11-bit character lengths. Set  
this option according to the characteristics of the data being  
transmitted.  
NOTE2: You can use the Model 2500RC Series to transmit lower-  
speed asynchronous data (up to 9.6 Kbps) over synchronous  
circuits by simple over-sampling. To do this, select the  
synchronous data format and set the line Line Rate (Software  
Switch Menu option 1) to at least four times that asynchronous  
data rate you wish to send. For example, use a Line Rate of 9.6  
Kbps or higher for 2.4 Kbps async data.  
17  
18  
 
DSR Status During Local Loopback  
NOTE: For DTE data rates of 56 kbps or 64 kbps, set the rate  
adapter to “Line Rate = DTE Rate”, and set the Line Rate to 56 or  
64 kbps, respectively. For DTE rate of 57.6 kbps, set rate adapter  
to “Line Rate = DTE Rate”, set line rate to 56 kbps, set DTE for two  
stop bits, and set CSU/DSU character length to “11 bits”.  
Choosing option 6 in the Software Switch Menu takes you to the  
DSR Loop Status Menu (below). This option controls the behavior of  
the DSR output during local loopback. To force DSR high (ON) during  
local loopback, enable this option. To force DSR low (OFF) during a  
local loopback, disable it.  
DTE Loop Control  
Choosing option 8 in the Software Switch Menu takes you to the  
DTE Loop Control Menu (below). The local and remote loopbacks on  
the Model 2500RC Series can be controlled from the DTE interface by  
raising or lowering the LL and RL signals. To allow the DTE to control  
these loopbacks in this manner, enable this option. Disable if you want  
the Model 2500RC Series to ignore these signals.  
Rate Converter/DTE Rate  
Choosing option 7 in the Software Switch Menu takes you to the  
Rate Adapter/DTE Rate Menu (opposite page). The Model 2500RC  
Series rate converter adapts a 56 Kbps or 64 Kbps line rate to slower  
DTE data rates. Set the Rate Converter to match the DTE data rate. If  
the DTE data rate is the same as the line rate, disable rate conversion  
by selecting item 6 on this menu.  
Clock Mode  
Choosing option 9 in the Software Switch Menu takes you to the  
Clock Mode Menu (below).  
(continued)  
19  
20  
 
Set this option as follows:  
RTS/CTS Delay  
Choosing option “b “ in the Software Switch Menu takes you to the  
RTS/CTS Delay Menu (below). This option lets you set the RTS/CTS  
turn-on delay to Normal or Extended. The delay interval decreases as  
the line rate increases.  
• Internal (Master): To use the Model 2500RC and 2520RC internal  
reference clock as the timing source, select item 1. Use internal timing  
in point-to-point applications where the Model 2500RC Series is being  
used as a limited distance modem. (Set the far-end Model 2500RC  
Series unit for looped timing as described below.)  
• Network (Looped): To have the Model 2500RC Series derive a  
transmit clock from the incoming data stream from the network, select  
item 2. This is the default setting and appropriate for most applications.  
(Models 2500RC and 2520RC only)  
• External (Terminal Timing): To have the Model 2500RC Series use  
the DTE-supplied transmit clock (pin 24 on and RS-232/V.24 interface  
or pins U and W on a V.35 interface), select item 3. Use external timing  
for tail-circuit applications, in which the RS-232 or V.35 ports of two  
Model 2500RC Series units are interconnected.  
• Switched 56 (Model 2510RC and 2520RC only): When using a  
Model 2510RC or 2520RC with Switched 56 service, select item 4.  
Anti-Streaming Timer  
Choosing option “a” (options “a” through “e” must be entered in  
lower-case letters) in the Software Switch Menu takes you to the Anti  
Stream Timer Menu (below). This option lets you enable or disable the  
anti-streaming timer, which protects multidrop networks from a drop that  
is continuously transmitting. If the DTE asserts RTS for a period of time  
exceeding the timer interface, the timer forces RTS off internally. This  
allows the rest of the multidrop network to resume operation. The  
Model 2500RC Series holds RTS off until the terminal drops RTS. The  
timer interval decreases as the line rate increases.  
21  
22  
 
3.3 REAR CARD CONFIGURATION  
3.3.1 Model 1000RCM12548 Strap Settings  
The Model 2500RC Series has two interface card options: the  
Model 1000RCM12548 (DB-25/RJ-48S) and the Model  
1000RCM13448 (M/34/RJ-48S). Each of these options supports one  
interface connection and one 4-wire connection. Figure 5 (below)  
illustrates the two different interface options for the Model 2500RC  
Series.  
Figure 7 shows strap locations for the Model 1000RMC12548  
(DB-25/RJ-48S) rear cards. These straps determine various grounding  
characteristics for the terminal interface and twisted pair lines.  
JB3  
(peg 1 on top)  
JB2  
(NOT USED)  
Model  
Model  
1000RCM12548  
1000RCM13448  
JB4  
(peg 1 on left)  
Figure 7. DB-25/RJ-48S strap locations  
The table below provides an overview of interface strap functions  
for the rear interface cards. Following this overview is a detailed  
description of each strap’s function.  
DB-25 F  
M/34 F  
Figure 5. Model 2500RC Series interface card options  
INTERFACE CARD STRAP SUMMARY TABLE #1  
Prior to installation, you will need to examine the rear card you  
have selected and make sure it is properly configured for your  
application. Each rear card is configured by setting straps located on  
the PC board. To configure the rear cards, you must set the  
configuration straps. Figure 6 (below) shows the orientation of these  
straps. Each strap can either be on pegs 1 and 2, or on pegs 2 and 3.  
Sections 3.3.1 and 3.3.2 describe the strap locations and possible  
settings for each rear card.  
Strap  
JB3  
Function  
Position 1&2  
Connected  
Connected  
Position 2&3  
Open*  
DTE Shield (Pin1) & FRGND  
FRGND & SGND  
JB4  
Open*  
DTE Shield (Pin 1) & FRGND (JB3)  
In the connected position, this strap links DB-25 pin 1 & frame  
ground. In the open position, pin 1 is “lifted” from frame ground.  
JB3  
Position 1&2 = DTE Shield (Pin 1) and FRGND Connected  
Position 2&3 = DTE Shield (Pin 1) and FRGND Not Connected  
Figure 6. Orientation of interface card straps  
23  
24  
 
4.0 INSTALLATION  
SGND & FRGND (JB4)  
This section describes the functions of the Model 1000R16 rack  
chassis, tells how to install front and rear Model 2500RC Series cards  
into the chassis, and provides diagrams for wiring the interface  
connections correctly.  
In the connected position, this strap links DB-25 pin 7 (Signal  
Ground) and frame ground. In the open position, pin 1 is “lifted” from  
frame ground.  
JB4  
Position 1&2 = SGND (Pin 7) and FRGND Connected  
Position 2&3 = SGND (Pin 7) and FRGND Not Connected  
4.1 THE MODEL 1000R16 RACK CHASSIS  
The Model 1000R16 Rack Chassis (Figure 9, below) has sixteen  
short range modem card slots, plus its own power supply. Measuring  
only 3.5” high, the Model 1000R16 is designed to occupy only 2U in a  
19” rack. Sturdy front handles allow the Model 1000R16 to be  
extracted and transported conveniently.  
3.3.2 Model 1000RCM13448 Strap Settings  
Figure 8 shows the strap location for the Model 1000RCM13448  
(M/34/RJ-48S) rear card. This strap determines whether Signal Ground  
and Frame Ground will be connected.  
JB4  
(peg 1 on left)  
Figure 9. Model 1000R16 Rack Chassis with power supply  
4.1.1 The Rack Power Supply  
The power supply included in the Model 1000R16 rack uses the  
same mid-plane architecture as the modem cards. The front card of  
the power supply slides in from the front, and the rear card slides in  
from the rear. They plug into one another in the middle of the rack.  
The front card is then secured by thumb screws and the rear card by  
conventional metal screws.  
Figure 8. M/34/RJ-48 strap locations  
SGND & FRGND (JB4)  
In the connected position, this strap links Signal Ground and frame  
ground.  
WARNING! There are no user-serviceable parts in the  
power supply section of the Model 2500RC Series.  
Voltage setting changes and fuse replacement should only  
be performed by qualified service personnel. Contact  
Patton Electronics Technical support at (301)975-1007 for  
more information.  
JB4  
Position 1&2 = SGND and FRGND Connected  
Position 2&3 = SGND and FRGND Not Connected  
(continued)  
26  
25  
 
5.0 OPERATION  
Switching the Power Supply On and Off  
Once the Model 2500RC Series unit is installed and configured  
properly it is ready to operate. This section describes the function of  
the LED indicators, the status displays, the use of loopback test modes,  
and Switched 56 dialing procedures (Models 2510RC and 2520RC  
only).  
The power switch is located on the front panel. When plugged in  
and switched on, a red front panel LED will glow. Since the Model  
1000R16 is a "hot swappable" rack, it is not necessary for any cards to  
be installed before switching on the power supply. The power supply  
may be switched off at any time without harming the installed cards.  
5.1 LED DESCRIPTIONS  
NOTE: Please refer to the Model 1000RP Series User Manual AC  
and DC Rack Mount Power Supplies for fuse and power card  
replacement information.  
The Model 2500RC Series is equipped with nine LED indicators that  
monitor the status of communication. Figure 12 (below) shows the  
location of the LEDs on the Model 2500RC Series front panel. Note  
also the location of the test mode switches and RS-232 control port  
(used in Switched 56 dialing as well as software configuration).  
Following Figure 12 is a description of each LED’s function.  
4.2 INSTALLING THE MODEL 2500RC SERIES INTO THE CHASSIS  
The Model 2500RC Series is comprised of a front card and a rear  
card. The two cards meet inside the rack chassis and plug into each  
other by way of mating 50 pin card edge connectors. Use the following  
steps as a guideline for installing each Model 2500RC Series into the  
rack chassis:  
“TD” and “RD” will glow red to indicate an Idle condition or  
Binary “1” data on the respective terminal interface signals.  
Green indicates Binary “0” data.  
1. Slide the rear card into the back of the chassis along the metal  
rails provided.  
2. Secure the rear card using the metal screws provided.  
Model 2500RC  
3. Slide the card into the front of the chassis. It should meet the  
rear card when it’s almost all the way into the chassis.  
DTR  
Power  
TD  
4. Push the front card gently into the card-edge receptacle of the  
rear card. It should “click” into place.  
RD  
CTS  
OS  
CD  
5. Secure the front card using the thumb screws.  
NS  
NOTE: Since the Model 1000R16 chassis allows “hot  
swapping” of cards, it is not necessary to power down the rack  
when you install or remove a Model 2500RC Series.  
TM  
ER  
Remote  
Analog  
511  
511/E  
4.3 WIRING THE MODEL 2500RC SERIES  
Each of the rear interface cards compatible with the Model 2500RC  
Series has one terminal interface port and one 4-wire (twisted pair)  
port. For specific interface pin-outs, refer to the diagrams in  
Appendix D of this manual.  
Figure 10. The Model 2500RC Series' front panel LEDs  
(continued)  
28  
27  
 
“CTS” will glow green to indicate an On condition. When on,  
the unit is ready to send data. If CTS remains off, check the  
Forced RTS, Circuit Assurance and Anti-Stream settings.  
5.2.1 Displaying Configuration Settings  
To display the current settings of the hardware and /or software  
switches, go to the Main Menu and select item 2, “Read Configuration”.  
This will take you to the Read Configuration Menu (below).  
“CD” will glow green to indicate that a valid carrier is present.  
If CD is not lit, there is no valid carrier signal detected.  
“DTR” will glow green to indicate that the DTR signal from the  
terminal is active.  
“NS” will glow red to indicate No Signal. This means the  
Model 2500RC Series receiver does not detect a signal from  
the digital service provider (or, in the case of short-haul  
operation, from the remote Model 2500RC Series). If NS is lit,  
check for an unplugged cable, broken wire or an incorrect Line  
Rate selection.  
In the Read Configuration Menu, you may select item 1 to read the  
hardware switch configuration or item 2 to read the software switch  
configuration. A sample screens is shown below:  
“OS” glows red to indicate Out-of-Service. This means the  
Model 2500RC Series has received an Out-of-Service signal  
from the digital service provider and indicates a problem with  
the service provider’s equipment. If this condition persists,  
contact your service provider.  
“ER” glows red to indicate that an Error has been detected in  
the received signal. ER will flash if the Model 2500RC Series  
receives illegal bi-polar violations or framing errors. During the  
511 or 511/E test, ER will flash to indicate that the Test Pattern  
Detector has detected a bit error.  
“TM” glows red to indicate Test Mode. It will light if the unit is  
placed into a test mode. The unit can be placed in test mode  
by the local user, by the remote user or by the service  
provider.  
5.2 STATUS DISPLAYS  
The Model 2500RC Series lets you use a VT-100 type RS-232  
terminal to display the current configuration settings, as well as the  
line/loop status.  
Important: Please be sure you have read Section 3.2, and the Model  
1000CC User Manual before attempting to implement the instructions  
in the remainder of Section 5.2.  
(continued)  
30  
29  
 
5.2.2 Displaying Line/Loop Status  
LAL Test Activation  
To check the current status of the Model 2500RC Series and the  
associated circuit, go to the Main Menu and select item 4, “Display  
Line/Loop Status”1,2 . This will take you to a screen similar to the  
Line/Loop Status Monitor Screen (below).  
The LAL test may be activated in one of three ways:  
1.  
2.  
Toggle the front panel “Local/Normal/Remote” switch to the  
right hand side to the “Local” position.  
Activate the LL lead from the DTE (Note: in order to use this  
option, the DTE Loop Control option must be enabled–see  
Section 3.2.4). If you are not sure which pin is the LL lead,  
please refer to the pinout diagrams in Appendix D.  
3
From a terminal, first go to the Main Menu and select item 3 to  
display the Software Switch Menu (Section 3.2.4) In the  
Software Switch Menu, select item “e” to go to the Local Line  
Loop Menu (see below). To activate LAL, select item 1.  
NOTE1: To refresh the display with the most up-to-date  
information, key “4” and press [RETURN].  
NOTE2: The error count is reset after each time it is displayed.  
5.3 LOOPBACK TEST MODES  
The Model 2500RC Series offers three loopback tests to evaluate  
the condition of the CSU/DSUs and the communication link: local  
analog loopback, remote digital loopback and telco loopback (C.O.  
Loopback).  
LAL Test Procedure  
Once LAL is activated, the Model 2500RC Series transmit output is  
connected to its own receiver. The “Test” LED should be lit. Follow  
these steps to complete the test:  
5.3.1 Local Analog Loopback (LAL)  
1.  
Verify that the data terminal equipment is operating properly  
and can be used for a test. If a fault is indicated, call a  
technician or replace the unit.  
The Local Analog Loopback (LAL) test checks the operation of the  
local Model 2500RC Series. Any data sent to the local Model 2500RC  
Series in this test mode will be echoed (returned) back to the user  
device. For example, characters typed on the keyboard of a terminal  
will appear on the terminal screen (see Figure 11, below).  
2.  
Perform a BER (bit error rate) test on each unit using a  
separate BER tester (The Model 2500RC Series has a built-in  
BER tester–see Section 5.4). If the BER test equipment  
indicates no faults but the data terminal indicates a fault, follow  
the manufacturer's checkout procedures for the data terminal.  
Also, check the interface cable between the terminal and the  
Model 2500RC Series.  
CSU/DSU  
Figure 11. Local analog loop  
31  
32  
 
5.3.2 Remote Digital Loopback (RDL)  
RDL Test Procedure  
Once LAL is activated, the “Test” LED should be lit. Perform a BER  
(bit error rate) test on the system, using BER testers on both ends. If  
the BER test equipment indicates a fault and the Local Analog  
Loopback test was successful for both Model 2500RC Series units, you  
may have a problem with the line between the CSU/DSUs. You should  
inspect the line for proper connections.  
The Remote Digital Loopback (RDL) test checks the performance of  
both the local and remote Model 2500RC Series', and the  
communication link between them. Any characters sent to the remote  
Model 2500RC Series in this test mode will be returned back to the  
originating device. For example, characters typed on the keyboard of  
the local terminal will appear on the local terminal screen after having  
been passed to the remote Model 2500RC Series and looped back  
(see Figure 12, below).  
5.3.3 Telco Testing  
CSU/DSU  
The digital service provider’s central office can perform CSU Loop  
and DSU Loop diagnostic testing. These diagnostics allow the central  
office to evaluate circuit operation without making visits to a customer’s  
premises.  
Digital Network  
Figure 12. Remote digital loop  
CSU Loop  
The CSU Loop is activated when the central office reverses the DC  
sealing current that flows between the TX pair and the RX pair. In this  
case, the Model 2500RC Series recognizes this and loops signals on  
the RX pair back to the central office on the TX pair (see Figure 13,  
below). While the CSU Loop is activated by the central office, the TM  
light is illuminated.  
RDL Test Activation  
The RDL test may be activated in one of three ways:  
1) Toggle the front panel “Local/Normal/Remote” switch to the left  
hand side to the “Remote” position.  
2) Activate the RL lead from the DTE (Note: in order to use this  
option, the DTE Loop Control option must be enabled–see  
Section 3.2.4). If you are not sure which pin is the RL lead, please  
refer to the pinout diagrams in Appendix D.  
DSU  
CSU  
Digital Network  
Figure 13. CSU loop  
3) From a terminal, first go to the Main Menu and select item 3 to  
display the Software Switch Menu (Section 3.2.4) In the  
Software Switch Menu, select item “d” to go to the Set  
Remote Digital Loop Menu (see below). To activate RDL, select  
item 1.  
DSU Loop  
The DSU Loop is activated when the central office sends a DSU  
loop signal over the twisted pair wire. The Model 2500RC Series  
senses this signal and loops the digital data back to the central office  
(see Figure 14, below). While the DSU Loop is activated, the TM light  
is illuminated.  
Digital Network  
DSU CSU  
Figure 14. DSU loop  
33  
34  
 
5.4 THE V.52 BER TEST PATTERN GENERATOR  
5.5 SWITCHED 56 DIALING COMMANDS (MODELS 2510RC &  
2520RC)  
The Model 2500RC Series has a built-in test pattern generator and  
detector. It can be invoked at both ends of a link simultaneously (using  
two operators) or it can be invoked in conjunction with the LAL or RDL  
tests (using one operator). The following example requires two  
operators–one to initiate and monitor the test at the local Model  
2500RC Series, and one at the remote Model 2500RC Series. To use  
the V.52 BER test by itself, both operators should simultaneously follow  
these steps:  
CAUTION! For proper Switched 56 operation, you must enable  
the Circuit Assurance and Force RTS options as described in  
Section 4.0. Failure to do so may prevent the Model 2500RC  
Series unit from answering incoming Switched 56 calls.  
To access the Switched 56 dialing capabilities of the Mode 2500RC  
Series, go to the Main Menu (see Section 3.2.4) and select item 5, “Set  
Switched 56 Dialing Parameters”. This will take you to the Switched 56  
Menu (see below). The following paragraphs describe the commands  
in the Switched 56 Menu.  
1. Locate the “511/511E” toggle switch on the front panel of the  
Model 2500RC Series and move it to the left hand side (see  
Note 1). This activates the V.52 BER test mode and transmits  
a “511” pseudorandom test pattern to the other unit. If any  
errors are received, the receiving CSU/DSU’s red “Error” LED  
will blink sporadically (see Notes 1 & 2, below).  
2. If the test indicates no errors are present, move the V.52  
toggle switch to the right hand side, activating the “511/E” test  
(see Note 2). The 511/E test transmits the 511 pseudorandom  
test pattern and injects intentional errors about once per  
second. If the test is working properly, the receiving  
CSU/DSU’s red “Error” LED will blink regularly. A successful  
“511/E” test will confirm that the link is in place, and that the  
Model 2500RC Series’ built-in “511” generator and detector  
are working properly.  
NOTE1: The 511 BER pattern can also be activated using the  
software control port. Follow these steps: From a terminal, first go  
to the Main Menu and select item 3 to display the Software Switch  
Menu (Section 3.2.4) In the Software Switch Menu, select item “c”  
to go to the Send 511 Pattern Menu (see below). To send a 511  
pattern, select item 1.  
Store Phone Number (Enable DTR Dialing)  
Selecting item 1 in the Dial Menu lets you activate the Model  
2500RC Series’ “DTR Dialing” feature by storing a phone number in the  
unit’s non-volatile memory. The Model 2500RC Series automatically  
dials this number when the DTE raises the DTR lead. When you issue  
this command, the Model 2500RC Series responds with this prompt:  
NOTE2: Control Port activation of the “511E” pattern is not  
possible. The “511E” pattern may only be activated using the front  
panel toggle switch.  
Enter up to 12 digits (without hyphens or other alphabetic characters),  
followed by [RETURN]. For example: “13015551212.”  
CAUTION! Pressing [RETURN] by itself will erase any  
previously stored number from the unit’s non-volatile memory  
and cannot be undone. This will also disable DTR dialing.  
NOTE: To disable DTR dialing, press [RETURN] (and nothing  
else) when asked to enter the number to be stored.  
35  
36  
 
APPENDIX A  
SPECIFICATIONS  
Read Stored Number  
Selecting item 2 in the Dial Menu lets you view the phone number  
currently stored in the Model 2500RC Series non-volatile memory.  
DDS Type:  
Dedicated  
Transmission Format:  
Interface:  
Asynchronous, synchronous  
Dial New Number  
Selecting item 3 in the Dial Menu lets you dial a number other than  
the one stored in non-volatile memory. When you select this menu  
item, the Model 2500RC Series responds with this prompt:  
RS-232 and V.35  
Standards:  
AT&T 62310 compliant  
2.4, 4.8, 9.6, 19.2, 56 and 64 Kbps  
DDS Line Rates:  
DTE Rates:  
2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64  
Kbps; 57.6 Kbps, async, 2 stop bits  
Enter up to 12 digits (without hyphens or other alphabetic characters),  
followed by [RETURN]. For example: “13015551212.”  
Control Port:  
Configuration and diagnostics  
4-wire  
After dialing the number, the Model 2500RC Series will display the  
message, “Dialing” and then display each number as it is dialed. The  
Model 2500RC Series will then prompt the user to wait while the  
connection is made. One of the following messages will then be  
displayed to indicate the success or failure or the connection:  
Transmission Line:  
Applications:  
DDS point-to-point or multipoint;  
campus-area point-to-point  
CONNECT: The called unit has answered.  
Indicators:  
LED indicators for TD, RD, CTS, CD,  
DTR, No Signal, Out-of-Service, Error  
and Test Mode  
NO WINK: The central office did not send a wink signal  
within 5 seconds of line seizure.  
SHORT WINK: A wink signal less than 120 milliseconds  
was received.  
Diagnostics:  
V.54 compliant local and remote  
loopback tests; V.52 compliant  
511/511E BER test, TELCO CSU and  
DSU loops  
LONG WINK: A wink signal greater than 320 milliseconds  
was received.  
NO CARRIER: The called unit did not answer within 30  
seconds.  
Connectors:  
Power Supply:  
Dimensions:  
DB-25 and M/34  
115V or 230V AC  
7.3” x 6.6” x 1.6”  
DTR OFF: DTR must be on to dial.  
OFF HOOK: The Model 2500RC Series is already off-hook  
and in data mode.  
NOTE: The control port will not respond to additional commands  
until one of the above response messages is issued.  
Model 2500RC Series Distance Table (miles)  
Wire Gauge  
Data  
Rate  
22  
7.1  
7.6  
24  
4.9  
5.2  
6.2  
7.7  
26  
3.4  
3.6  
4.5  
5.8  
9.7  
9.1  
64 Kbps  
56 Kbps  
19.2 Kbps  
9600 bps  
4800 bps  
2400 bps  
Hang Up  
Selecting item 4 in the Dial Menu terminates the call.  
8.7  
10.4  
13.7  
15.1  
10.6  
14.2  
37  
38  
 
APPENDIX B  
CABLE RECOMMENDATIONS  
APPENDIX C  
FACTORY REPLACEMENT PARTS  
AND ACCESSORIES  
The Patton Model 2500RC Series operates at frequencies of 20kHz  
or less and has been performance tested by Patton technicians using  
twisted-pair cable with the following characteristics:  
Patton Model #  
Description  
10-2500RC......................DDS Cable, RJ48 - RJ48, 6 foot  
10-561S...........................Control Port Cable, EIA-561, 6ft, shielded  
12M-561 ..........................Adapter, EIA-561 to DB-25 Male  
12F-561...........................Adapter, EIA-561 to DB-25 Female  
082R2..............................Fuse 5x20mm, 200mA, 250V, Time-lag  
Little Fuse P/N 239.200  
Wire Gauge  
Capacitance  
Resistance  
19 AWG  
22 AWG  
24 AWG  
83nf/mi or 15.72 pf/ft.  
83nf/mi or 15.72 pf/ft.  
83nf/mi or 15.72 pf/ft.  
.0163 Ohms/ft.  
.0326 Ohms/ft.  
.05165 Ohms/ft.  
1000RPEM......................120/240V Rear Power Entry Module  
1000RPSM-2 ..................120/240V Front Power Supply Module  
1000RPEM-DC................DC Rear Power Entry Module  
1000RPSM-48A ..............48V Front Power Supply Module  
1000RPEM-V ..................120/240V CE Compliant Rear Power  
Entry Module  
To gain optimum performance from the Model 2500RC Series,  
please keep the following guidelines in mind:  
Always use twisted pair wire—this is not an option.  
1000RPSM-V ..................120/240V CE Compliant Front Power  
Supply Module  
• Use twisted pair wire with a capacitance of 20pf/ft or less.  
• Avoid twisted pair wire thinner than 26 AWG (i.e. avoid higher  
AWG numbers than 26)  
0805US ...........................American Power Cord  
0805EUR.........................European Power Cord CEE 7  
0805UK ...........................United Kingdom Power Cord  
0805AUS.........................Australia/New Zealand Power Cord  
0805DEN.........................Denmark Power Cord  
0805FR............................France/Belgium Power Cord  
0805IN.............................India Power Cord  
• Use of twisted pair with a resistance greater than the above  
specifications may cause a reduction in maximum distance  
obtainable. Functionality should not be affected.  
• Many environmental factors can affect the maximum distances  
obtainable at a particular site. Use the above data rate/distance  
table as a general guideline only.  
0805IS.............................Israel Power Cord  
0805JAP..........................Japan Power Cord  
0805SW...........................Switzerland Power Cord  
39  
40  
 
APPENDIX D  
(APPENDIX D - Continued)  
INTERFACE PIN ASSIGNMENT  
DDS INTERFACE  
The DDS Interface is an RJ-48S modular jack.  
DB-25 CONNECTOR, TERMINAL INTERFACE  
Pin #  
1
Signal  
Frame Ground  
Pin #  
Signal  
2
TD  
1
2
3
4
5
6
7
8
TX+  
TX-  
3
4
5
6
7
8
15  
17  
18  
20  
21  
24  
25  
RD  
RTS  
CTS  
DSR  
no connection  
no connection  
no connection  
no connection  
RX+  
SGND (Signal Ground)  
CD  
TC  
RC  
LL (Local Loop)  
DTR  
RL (Remote Loop)  
XTC  
RX-  
M/34 CONNECTOR, TERMINAL INTERFACE  
Pin #  
B
Signal  
SGND (Signal Ground)  
TM (Test Mode)  
C
RTS  
D
CTS  
CONTROL PORT INTERFACE  
E
DSR  
F
CD  
8 Position modular connector compliant with EIA-561.  
H
DTR  
L
LL (Local Loop)  
Pin #  
Signal  
M
N
P
TM (Test Mode)  
RL (Remote Loop)  
TD  
4
5
6
Signal Ground  
RD (Output)  
TD (Input)  
R
RD  
S
T
U
V
TD/  
RD/  
XTC  
RC  
W
X
Y
XTC/  
RC/  
TC  
AA  
TC/  
41  
42  
 
APPENDIX E  
TRANSMITTER CLOCK SOURCE DURING TEST LOOPS  
Dear Valued Customer,  
Thank you for purchasing Patton Electronics products! We do  
Analog  
Loop  
Originating  
Remote Loop Remote Loop  
Receiving  
appreciate your business. I trust that you find this user manual helpful.  
Clock Mode Normal  
We manufacture one of the widest selections of data communications  
products in the world including CSU/DSU's, network termination units,  
powered and self-powered short range modems, fiber optic modems, interface  
converters, baluns, electronic data switches, data-line surge protectors,  
multiplexers, transceivers, hubs, print servers and much more. We produce  
these products at our Gaithersburg, MD, USA facility, and can custom  
manufacture products for your unique needs.  
Internal  
External  
Network  
INT  
EXT  
RC  
INT  
INT  
INT  
INT  
EXT  
RC  
RC  
EXT  
RC  
RC = Received Clock  
We would like to hear from you. Please contact us in any of the  
following ways to tell us how you like this product and how we can meet your  
product needs today and in the future.  
Web:  
(301) 975-1000  
(301) 975-1007  
(301) 869-9293  
Sales E-mail:  
Support E-mail:  
Phone - Sales  
Phone - Support  
Fax:  
Mail:  
Patton Electronics Company  
7622 Rickenbacker Drive  
Gaithersburg, MD 20879 USA  
We are committed to a quality product at a quality price. Patton  
Electronics is BABT and ISO 9001 certified. We meet and exceed the highest  
standards in the industry (CE, UL, etc.).  
It is our business to serve you. If you are not satisfied with any  
aspect of this product or the service provided from Patton Electronics or its  
distributors, please let us know.  
Thank you.  
Burton A.Patton  
Vice President  
P.S. Please tell us where you purchased this product.  
Copyright ©  
Patton Electronics Company  
All Rights Reserved  
_________________________________________________________  
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