Patton electronics IM1/F-128K User Manual

USER
MANUAL

MODEL IM1/F-128K

G.703 Interface Module

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

Part#: 07MIM1/F128-B
Doc#: 090141UB
Revised 08/12/99

An ISO-9001

Certified Company

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1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model IM1/F-128K 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 IM1/F-128K 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 IM1/F-128K has been tested and
complies with the limits for a Class A computing device in accordance
with the specification in Subpart J of Part 15 of FCC rules, that are
designed to provide reasonable protection from such interference in a
commercial installation. However, this is no guarantee that interference
will not occur in a particular installation. If the Model IM1/F-128K 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, reorienting 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 use only a shielded twisted
pair data cable that is bonded to metalized external outer shield plugs
at both ends. The use of a shielded cable satisfies compliance with the
Electromagnetic Compatibility (EMC) directive.

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:

Tel: [phone]

Email: [e-mail].

www: http://www.patton.com

Patton Electronics’technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Model IM1/F-128K. Technical Service hours: 8AM to 5PM EST,

Monday through Friday.

NOTE: Packages received without an RMA number will not be

accepted.

WARNING! This device is not intended to be connected

to the public telephone line.

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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 us at: [phone], http://www.patton.com; support@pat-

ton.com.

2.1 FEATURES

• Designed for use with Patton Electronics Access products that
receive QuickConnect

TM

Modules which support 128K synchro-

nous rates.

• Provides 128K co-directional G.703 interface

• Offers a single Tx/Rx interface with a standard RJ-45 connector as
specified in TBR 14.

• Point-to-point distance up to 3,000 feet (914m) using 24 AWG
twisted pair.

• Made in the U.S.A.

2.2 DESCRIPTION

The Patton Model IM1/F-128K Interface Module converts data

from a 128K G.703 network into a Transistor-Transistor Logic (TTL)
compatible signal that is transported by the Patton Access Products.
The G.703 network provides a 128K co-directional three level signal on
a clear channel.The Model IM1/F-128K is capable of handling either
network timing or modem timing, thereby realizing network extension or
network replacement configurations.The clock jitter is attenuated
according to G.823.

2.3 SYSTEM DESCRIPTION

This section describes the features that the entire system (G.703

interface, combined with the modems) will support.

2.3.1 APPLICATIONS AND ASSOCIATED TIMING

There are two typical applications that result in two different timing

modes for the G.703 interface. These are illustrated below.

Timing of Application 1: Network Loop Extension

In this application, the network supplies the timing for the entire
system. The first G.703 recovers the timing. It has to smooth the clock
before it supplies the clock (XCLK1) and the data (TXD1) to the first
modem transmitter, so it can directly use the clock. The Rx of the sec­ond modem recovers the clock and presents a “jittery”clock (RXCLK1)
and data (RXD1) to the second G.703’s transmitter. This transmitter
has to smooth the clock before it uses the clock to transmit.

The Rx of the second G.703 recovers the timing and clocks the
data into a FIFO. The Tx of the second modem takes its recovered
clock and sends it (TXCLK1) to the G.703 FIFO for data (TXD1). The
Rx of the first modem recovers the timing and clocks (RXCLK1) the
data (RXD1) into a FIFO. The Tx of the first G.703 uses the first
G.703’s recovered clock and sends it to the FIFO for data.

Figure 1. Network Loop Extension Configuration

RX

TX

CSU
DTE

G.703

RX

RX

RX

RX

RX

2 or 4 Wire

TX

G.703 INTF-

MODEM

TIMED MODE

SECOND MODEM

FIFO

TX

SMOOTHED

TX

TX

TX

FIFO

FIFO

G.703

FIFO

HOST

MODEM -

RECOVERED

TIMING

FIRST MODEM

HOST

MODEM -

INTERFACE

(EXTERNAL)

TIMING

G.703 INTF-

NETWORK

TIMED MODE

NETWORK

G.703 TX

SMOOTHS

RX MODEM

CLOCK

NOTE: The “smoothed”clocks referred to in this section indi-

cate that a phase locked VCO is used to create a jitter free clock
that is locked to a source clock.