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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 warrant-
ed for One Year parts and labor. If any questions or problems arise
during installation or use of this product, please do not hesitate to con-
tact us at: (301) 975-1007, 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 sec-
ond 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.
