Patton electronics 2703-X21 User Manual

USER
MANUAL

MODEL 2703-X21

G.703/E1 Digital Modem

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

Part# 07M2703-X21-C
Doc# 031111UC
Revised 6/19/98

CERTIFIED

An ISO-9001

Certified Company

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 2703-X21 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.
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.

1.1 RADIO AND TV INTERFERENCE

The Model 2703-X21 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 2703-X21 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 2703­X21 does cause interference to radio or television reception, which can
be determined by disconnecting the unit, 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).

1.2 SERVICE

All warranty and non-warranty 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 Service at [phone].

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
Model 2703-X21. Technical Service hours: 8AM to 5PM EST, Monday

through Friday.

1

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 or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at [phone].

2.1 FEATURES

• Synchronous network data rate of 2.048 Mbps

• Four selectable terminal rates: 256 kbps, 512 kbps,

1.024 Mbps and 2.048 Mbps

• Supports X.21 terminal interfaces on a DB-15 connector

• Both 75 ohm (BNC) and 120 ohm (modular) network terminations

• Selectable Internal (master) or Network (slave) clocking

• Loopback test modes

• Front panel LED indicators for power, network,
master clock and test loop

2.2 DESCRIPTION

The Patton Model 2703-X21 G.703/E1 Access Converter wears

several hats: As an

access product

, the Model 2703-X21 receives
unstructured, synchronous 2.048 Mbps data from a G.703 network and
sends it to a router, bridge, multiplexer or other device. As an

interface

converter

, the Model 2703-X21 accepts 120 Ohm twisted pair or 75
Ohm dual coax network connections (both types of interfaces
provided). Then it converts the signals to an X.21 format on a DB-15
connector.

As a

Rate Adapter

, the Model 2703-X21 lets a lower bandwidth
device–256 kbps, 512 kbps, or 1.024 Mbps–connect to a 2.048 Mbps
G.703 link. The Model 2703-X21 supports Internal (master) or Network
(slave) clocking. Loopback test is built-in, and front panel LEDs monitor
power, network, master clock and test loop. Several power supply
options are available.

2

Switch Set S1

The configuration switches on S1 set clocking, rate adaptation,
loopback enable, and data invert. The default settings are
summarized in the table below.

S1-1: Master/Slave Clock

The setting for switch S1-1 determines whether the Model 2703­X21 provides the master clock, or is slaved to another clock source.

S1-1

Setting
On Model 2703-X21 is master
Off Model 2703-X21 is slave, (clock is recovered

from the network)

3.0 CONFIGURATION

The Model 2703-X21 is equipped with one DIP set containing eight
switches (externally accessible), as well as seven jumpers (internal).
These switches and jumpers allow configuration of clocking, data rate,
and test options. The Model 2703-X21 is also equipped with an internal
switch that allows selection of 115 or 230 VAC power inputs (Note: this
switch is not present in Models 2703-X21-UI and 2703-X21-DC). This
section describes switch and jumper locations and explains all possible
configurations.

3.1 EXTERNAL DIP SWITCH SETTINGS

The Model 2703-X21’s DIP switch set is located on the underside
of the unit (see Figure 1, below). Figure 2 (below), shows the
orientation of the switch set. All possible settings for the Model 2703­X21’s switches are presented in the summary table and descriptions on
the following pages. If you have additional questions regarding
configuration, contact Patton Technical Support at [phone].

3 4

Figure 2. Close up of configuration switches

OFF

12345678

DHS-8

OFF

ON

Figure 1. Underside of Model 2703, showing external DIP switch location

S1 SUMMARY TABLE

Position Function Factory Default

S1-1 Clock Master/Slave On Master
S1-2 Rate Adaptation Off
S1-3 Rate Adaptation Off
S1-4 Test Enable Off Front Panel
S1-5 Data Inversion Off Not Inverted
S1-6 Not Used Off N/A
S1-7 Not Used Off N/A
S1-8 Not Used Off N/A

}

2.048 Mbps

S1

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ON