Patton electronics 2500RC, 2510RC, 2520RC User Manual

USER
MANUAL

MODEL 2500RC Series

Models 2500RC, 2510RC
and 2520RC:
All-Rate CSU/DSU
Rack Mount Card

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]
http://www.patton.com

Part# 07M2500RC--D
Doc# 099011UD
Revised 3/19/97

CERTIFIED

An ISO-9001

Certified Company

TABLE OF CONTENTS

Section Page

1.0 Warranty Information.............................................................2

1.1 Radio and TV Interference

1.2 FCC Information

1.3 CE Information

1.4 Service Information

2.0 General Information...............................................................5

2.1 Product Features

2.2 General Product Description

2.3 Supported Applications

3.0 Configuration .........................................................................7

3.1 Front Card Configuration - Hardware Switches

3.2 Front Card Configuration - Software Switches

3.3 Rear Card Configuration

4.0 Installation ...........................................................................26

4.1 The Model 1000R16 Rack Chassis

4.2 Installing the Model 2500RC Series into the Chassis

4.3 Wiring the Model 2500RC Series

5.0 Operation.............................................................................28

5.1 LED Descriptions

5.2 Status Displays

5.3 Loopback Test Modes

5.4 The V.52 BER Test Pattern Generator

5.5 Switched 56 Dialing Commands (Models 2510RC & 2520RC)

Appendix A - Specifications
Appendix B - Cable Recommendations
Appendix C - Factory Replacement Parts and Accessories
Appendix D - Interface Pin Assignments
Appendix E - Transmitter Clock Source During Test Loops

1

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 2500RC Series
components to be free from defects, and will—at our option—repair or
replace the product should it fail within one year from the first date of
shipment.This warranty is limited to defects in workmanship or
materials, and does not cover customer damage, abuse, or
unauthorized modification. This product contains no serviceable parts;
therefore the user shall not attempt to modify the unit in any way. If this
product fails or does not perform as warranted, your sole recourse shall
be repair or replacement as described above. Under no condition shall
Patton Electronics be liable for any damages incurred by the use of
this product. These damages include, but are not limited to, the
following: lost profits, lost savings and incidental or consequential
damages arising from the use of or inability to use this product. Patton
Electronics specifically disclaims all other warranties, expressed or
implied, and the installation or use of this product shall be deemed an
acceptance of these terms by the user. In the event the user detects
intermittent or continuous product malfunction due to nearby high
power transmitting radio frequency equipment, the user is strongly
advised to take the following steps: use only data cables with an
external outer shield bonded to a metal or metalized connector; and,
configure the rear card as shown in section 3.3. of this manual.

1.1 RADIO AND TV INTERFERENCE

The Model 2500 Series generates and uses radio frequency
energy, and if not installed and used properly—that is, in strict
accordance with the manufacturer's instructions—may cause
interference to radio and television reception. The Model 2500 Series
has been tested and found to comply with the limits for a Class A
computing device in accordance with the specifications in Subpart J of
Part 15 of FCC rules, which are designed to provide reasonable
protection from such interference in a commercial installation.
However, there is no guarantee that interference will not occur in a
particular installation. If the Model 2500 Series does cause
interference to radio or television reception, which can be determined
by disconnecting the cables, the user is encouraged to try to correct the
interference by one or more of the following measures: moving the
computing equipment away from the receiver, re-orienting the receiving
antenna, and/or plugging the receiving equipment into a different AC
outlet (such that the computing equipment and receiver are on different
branches).In the event the user detects intermittent or continuous
product malfunction due to nearby high power transmitting radio
frequency equipment, the user is strongly advised to take the following
steps: use only data cables with an external outer shield bonded to a
metal or metalized connector; and, configure the rear card as shown in
section 3.3.1 of this manual.

2

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: [phone]; http://www.patton.com; or,

[e-mail].

Notice: Packages received without an RMA number will not be

accepted.

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.

1.2 FCC INFORMATION

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.

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.

If you have any trouble operating the Model 2500 Series, please
contact Patton Technical Support at [phone]. 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 Code Jacks

2.4 Kbps Digital Interface 04DU5-24 6.0F RJ48S

4.8 Kbps Digital Interface 04DU5-48 6.0F RJ48S

9.6 Kbps Digital Interface 04DU5-96 6.0F RJ48S
56 Kbps Digital Interface 04DU5-56 6.0F RJ48S

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 4

2.3 SUPPORTED APPLICATIONS

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.

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.

Campus Area Short Haul Operation (Models 2500RC, 2520RC)

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.

6

2.0 GENERAL INFORMATION

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: [phone]; http://www.patton.com; or,

[e-mail].

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

• 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

2.2 GENERAL PRODUCT DESCRIPTION

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.

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 rack­card versions (only rack card versions are covered in this manual).

5

MODEL 2500RC SERIES APPLICATIONS

2500RC 2510RC 2520RC

Line Rate Switches All line rates 56 Kbps only All line rates

Supported Supported

Mode Switches Supports all modes Switched 56 only All modes

except Sw-56 Supported

Not Supported Supported Supported

Dialing
Commands

3.1.1 Switch Set “S1”

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.

Switches S1-1. S1-2 and S1-3: Line Rate

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.

S1-1

S1-2 S1-3 Setting
On On On 2.4 Kbps
On On Off 4.8 Kbps
On Off On 9.6 Kbps
On Off Off 19.2 Kbps
Off On On 56 Kbps
Off On Off 64 Kbps
Off Off Off Force configuration

pointer to default to
Hardware Switches

(See Section 3.2)

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.

3.0 CONFIGURATION

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.

3.1 FRONT CARD CONFIGURATION - HARDWARE SWITCHES

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).

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.

87

SWITCH SET S1 SUMMARY TABLE

56,000 bps

}

Position Function Factory Default Exceptions

S1-1 Line Rate Off
S1-2 Line Rate On
S1-3 Line Rate On
S1-4 Circuit Assurance Off Disabled

Model 2510:Enabled

S1-5 RTS Off Forced On
S1-6 Character Length Off 10-Bit
S1-7 Data Format Off Synchronous
S1-8 DSR Loop Status Off DSR Off

Figure 1. Model 2500RC Series front card, showing location of switches

ON

12345678

ON

12345678

SW2

SW1

Interface

Driver
Board

FRONT

LSD

MSD

Rotary Address

Switches

12345678

ON

OFF

ON

Figure 2. Close up of DIP switches showing ON/OFF positions.

NOTE: The ON position is oriented toward the front of the Model 1092RC.

THIS SIDE UP FOR V.35

Switch S1-4: Circuit Assurance

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.

Circuit

S1-4 Assurance Description

On Enabled CTS will go low and the transmitter

will be held off if the receiver is in
the No Signal state or CD is low

Off Disabled The transmitter and CTS will

operate without regard to the
receiver state

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.

S1-5 RTS Description

Off Forced On An On (high) condition is trans-

mitted regardless of the state of
this unit’s RTS input

On Follows DTE The RTS input controls the

transmitter

Switch S1-6: Character Length

In asynchronous data format, 10 and 11 bit characters are
supported. This setting is ignored in synchronous data format.

Character Character Description

S1-6 Length Start Data bits Parity Stop bits

Off 10-bit 1 8 None 1 or more

1 7 1 1 or more
1 7 None 2

On 11-bit 1 8 1 1 or more

1 9 None 1 or more

Switch S1-7: Data Format

The data format selection controls whether an async-to-sync

conversion is performed.

S1-7 Data Format

On Asynchronous
Off Synchronous

Switch S1-8: DSR System Status

The behavior of the DSR output during performance of a local loop

can be controlled.

DSR

S1-8 Loop Status Description

On DSR On DSR remains high (On) during the

Analog Loop

Off DSR Off DSR goes low (Off) during the

Analog Loop

3.1.2 Switch Set “S2”

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.

9 10

SWITCH SET S2 SUMMARY TABLE

Position Function Factory Default Exceptions

S2-1

Rate Adapter

Off

S2-2

Rate Adapter

Off
S2-3 Rate Adapter Off
S2-4 DTE

Loop Control

Off Disabled
S2-5 Clock

Mode

Off Off
S2-6 Clock Mode Off On
S2-7

Anti-Stream Timer

On Disabled
S2-8 RTS/

CTS Delay

Off Normal

Model 2510
Switched 56

}

Network
Clock

}

DTE Rate

}

Switches S2-1, S2-2 and S2-3: Rate Adapter/DTE Rate

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.

S2-1 S2-2 S2-3 DTE Rate

On On On 2.4 kbps
Off On On 4.8 kbps
On Off On 9.6 kbps
Off Off On 19.2 kbps
On On Off 38.4 kbps
Off Off Off Line Rate = DTE Rate

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).

Switch S2-4: DTE Loop Control

The local loop and remote loop can be activated from the DTE
interface using signals “LL” and “RL”.

S2-4

On Enable LL and RL inputs
Off 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 S2-6 Mode Description

On Off External Clock Mode Transmit Clock

derived from terminal
interface

Off Off Network Clock Mode Transmit clock derived

(Looped Clock Mode) from the received line

signal; Use this mode
for Dedicated DDS
operation

On On Internal Clock Mode Transmit Clock

derived internally

Off On Switched 56 (Model 2510, 2520)

Switch S2-7: Anti-Stream Timer

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.

T

imer Value in Sec at Various Line Rates

S2-7 Timer 56 19.2 9.6 4.8 2.4

On Disabled
Off Enabled 2 4 8 15 30

Switch S2-8: RTS/CTS Delay

The RTS/CTS turn-on delay can be set to Normal or Extended.

Delay in mSec at V

arious Line Rates

S2-8 CTS Delay 56 19.2 9.6 4.8 2.4

Off Normal 0.3 0.9 1.9 3.8 7.5
On Extended 1.3 3.8 7.5 15 30

3.1.3 Setting the Reversible Interface Driver Board

The Model 2500RC Series supports both RS-232 and V.35
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.

1211

Figure 3. Closeup of Model 2500RC Interface Driver Board

ON

12345678

ON

12345678

Interface
Driver
Board

FRONT THIS SIDE UP FOR V.35