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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 2703-
X21 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 (301) 975-1007.  

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.

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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 (301) 975-1007.

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.

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Summary of Contents for 2703-X21

Page 1: ...MODEL 2703 X21 G 703 E1 Digital Modem SALES OFFICE 301 975 1000 TECHNICAL SUPPORT 301 975 1007 http www patton com Part 07M2703 X21 C Doc 031111UC Revised 6 19 98 C E R T I F I E D An ISO 9001 Certif...

Page 2: ...quipment 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 Mate...

Page 3: ...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 l...

Page 4: ...is not necessary S1 5 Setting On Data inverted Off Data not inverted S1 6 S1 7 S1 8 Not Used 5 3 2 INTERNAL JUMPER SETTINGS The Model 2703 X21 s seven jumpers are located on the PC board inside the u...

Page 5: ...m Shield to Ground Connection This setting determines whether the shield of the 120 Ohm modular cable is connected to earth ground This connection is optional when operating in 120 Ohm balanced mode T...

Page 6: ...PLY OPTIONS The Model 2703 X21 is available with three power supply options The Standard power supply option Model 2703 X21 or 2703 X21 230 is factory configured for either 115 or 230 VAC depending on...

Page 7: ...air connection the Model 2703 X21 is equipped with dual female BNCs TX and RX for connection to a 75 ohm dual coax G 703 network interface The outer conductor of the coax cables is isolated from syste...

Page 8: ...loopback mode 13 5 3 LOOPBACK TEST LAL The Model 2703 X21 is equipped with a Local Analog Loopback LAL mode to assist in evaluating the operation of the local Model 2703 X21 Any data sent to the loca...

Page 9: ...r Sensitivity 10 dB 0dB 2 4V Power 85 265 VAC switch selectable 50 60 Hz 85 265 VAC 50 60 Hz universal input option 48 VDC option Temperature Range 0 50 C 32 122 F Altitude 0 15 000 feet Humidity 5 to...

Page 10: ...ost Office Technical Guides 2 or 26 and given permission to attach Any other usage will invalidate the approval of the Interface Module Interconnection of the Interface Module the port marked Network...

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