Patton 2703RC-A User Manual

UUSSEERR
MMAANNUUAALL

MODEL 2703RC-A

MegaLink-1™

G.703/E1 Digital Modem:
Rack Mount Card

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

Part# 07M2703RC-A-A
Doc# 031122UA
Revised 2/4/99

An ISO-9001

Certified Company

11..00 WWAARRRRAANNTTYY IINNFFOORRMMAATTIIOONN

Patton Electronics warrants all Model 2703RC-A 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 2703RC-A 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 2703RC-A 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 2703RC-A
does cause interference to radio or television reception, which can be
determined by turning the power off or removing the card, 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 3.2 of this manual.

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1.2 CE NOTICE AND TELECOMMUNICATIONS APPROVALS

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.

The Model 1000RCM703120 and 1000RCM70375 rear cards are
in compliance with the Telecommunication technical requirements
CRT=12; 2.048 Mbps digital unstructured leased line (D2048U) attach­ment requirements for terminal equipment interface

1.3 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, support@pat-

ton.com.

NOTE: 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 2703RC-A. Technical Service hours: 8AM to 5PM EST,

Monday through Friday.

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22..00 GGEENNEERRAALL IINNFFOORRMMAATTIIOONN

Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected by Patton’s qualified tech­nicians. 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 DTE Rates: 256, 512, 1024, and 2048 Kbps

• EIA-530 (EIA-422 Electrical), V.35, or X.21 terminal interfaces

• 120 ohm (twisted pair) or 75 ohm (coax) network terminations

• Master and Slave (network) clocking

• Built-in local loopback test

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

• Mounts in Patton’s 16-slot rack chassis and 2/4/8-slot Cluster
Boxes

• Made in the U.S.A.

2.2 DESCRIPTION
The Patton

MegaLink™

Model 2703RC-A G.703/E1rack card

modem receives unstructured, synchronous 2.048 Mbps data from a

G.703 network and sends it to a router, bridge, multiplexer or other
device. The Model 2703RC-A is available with two interface options:
120 Ohm twisted pair to the network with EIA-530 (EIA-422) or V.35
(utilizing a 25 pin connector) to the terminal, or 75 Ohm dual coax to
the network with X.21 to the terminal. An additional feature allows the
EIA-530 terminal interface to be adapted to X.21 using a special DTE
cable (available from Patton).

The Model 2703RC-A is designed to mount in Patton’s 2U high, 16­slot rack chassis or 2/4/8-slot Cluster Boxes. These have a switchable
120/240 VAC power supply (optional 48 VDC) and mount cards in a
mid-plane architecture: front “function” cards and rear “interface” cards
can be hot-swapped independently, providing great flexibility. The
Model 2703RC-A supports Internal (master) and Network (slave) clock­ing. Loopback test is built-in, and front panel LEDs monitor power, net­work, master clock and test loop.

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33..00 CCOONNFFIIGGUURRAATTIIOONN

Two cards make up a single Model 2703RC-A G.703 Converter - a
front function card and a rear interface card. Each may require config­uration depending upon the product application. This section
describes the location and orientation of the Model 2703RC-A’s config­uration switches and jumpers, and provides descriptions for all set­tings.

3.1 FRONT CARD CONFIGURATION

The Model 2703RC-A front card has a single bank of eight DIP
switches located on the top of the printed circuit board. Figure 1,
below, shows the position of the switches on the board.

Changing the DIP Switch Settings

Figure 2 shows the orientation of the DIP switches with respect to the
“ON” and “OFF” positions.

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Figure 1. Model 2703RC-A board, showing switch locations

DIP Switch

OFF ON

1

8

Figure 2. Close up of the configuration switches

NOTE: The OFF position is oriented toward the front of the Model 2703RC-A

OFF

ON

Front Panel

3.1 DIP Switches S1 - S8

The configuration switches on S1 - S8 may be used to set data
inversion, the DTE bit rate, and clocking modes. Default settings of S1
through S8 are shown in the table below. Descriptions of each switch
follow the table.

Switch S1: Data Inversion

Set Switch S1 to determine whether or not the data stream from
the local DTE is inverted within the Model 2703RC-A before being
passed to the G.703 network. You may need to invert the data stream
when you use the Model 2703RC-A with an imbedded G.703 device
that inverts the data on the remote end. Data inversion is typically not
necessary.

S1-1

Setting
On Data inverted
Off Data not inverted

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Position Function Factory Default

S1 Data Inversion Off Non-Inverted
S2 Rate Adaptation (DTE Rate) Off
S3 Rate Adaptation (DTE Rate) Off
S4 Off
S5 Off
S6 Clock Mode Off Network
S7 Off
S8 Off

SWITCH SUMMARY TABLE

2.048 Mbps

}

Reserved

Reserved

NOTE: The PCM data stream must be inverted if this Model
2703RC-A is to be connected to a standalone Model 2703
Firmware Revision B (or older) unit at 256, 512, and 1024 kbps.
The firmware version of the standalone 2703 is printed on the
bottom side of the unit.

Switches S2 and S3: Rate Adaptation (DTE Rate)

Set Switches S2 and S3 together to allow the Model 2703RC-A to
adapt to terminal devices that run at data rates less than 2.048 Mbps
(The network rate remains 2.048 Mbps regardless of the terminal rate
adaptation setting). The setting you select must match the data rate of
your terminal device.

S2

S3 Setting
Off Off 2.048 Mbps
On Off 1.024 Mbps
Off On 512 Kbps
On On 256 Kbps

Switches S4 and S5:

Reserved for Future Use

Switches S4 and S5 are reserved for future use and must remain

in the Off position.

Switch S6: Internal/Network Clock

Set Switch S6 to allow the Model 2703RC-A to provide an internal

clock, or recover the clock from the received G.703 input signal.

S6 Setting
On Model 2703RC-A clock is internal
Off Model 2703RC-A clock is recovered from the network

NOTE: The 2703RC-A does not support an external (DTE
Source) clock option.

Switches S7 and S8:

Reserved for Future Use

Switches S7 and S8 are reserved for future use and must remain

in the Off position.

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