Patton IM 1-F User Manual

USER
MANUAL

MODEL IM 1/F

G. 703 Interface Module

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]

http://www.patton.com

Part# 07MIM1F-B
Doc# 090071UB
Revised 08/10/99

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model IM 1/F 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 IM 1/F 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 IM 1/F 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 IM 1/F 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).

21

1.2 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
Service at: [phone], http://www.patton.com; 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 IM 1/F. Technical Service hours: 8AM to 5PM EST, Monday

through Friday.

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.

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 and support 64K or 128K syn-

chronous rates.

• Provides 64K codirectional interface compliant with the G.703
electrical specs.

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

• Option to work in two timing modes: Clear channel or octet timing.

• Complies with ITU/CCITT G.823 (Control of Jitter).

• Point-to-point distance up to 4,000 feet (1219m) using 24 AWG
twisted pair.

• Made in the U.S.A.

2.2 DESCRIPTION

The Patton Model IM 1/F Interface Module converts data from a

64K G.703 network into a Transistor-Transistor Logic (TTL) compatible
signal that is transported by the PE 1090 or 1092 Modem or a similar 2
or 4 wire short haul modem that has identical pin outs and edge con­nector style (see note, below). The G.703 network provides a 64K co­directional three level signal using either octet timing or clear channel
mode. The IM will detect and pass either octet timing (preserving byte
integrity over a 128kbps modem link) or clear channel timing (without
byte integrity preservation) over a 64Kbps modem link. The IM is
capable of handling either network timing or modem timing, thereby
realizing network extension or network replacement configurations.
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.

NOTE: The “smoothed” clocks referred to in this section indicate
that a phase locked VCO is used to create a jitter free clock that is

locked to a source clock.

3

4

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

The first G.703 interface is in Network Timed mode. The second is in

Modem Timed mode. See Figure 1 above.

Timing of Application 2: Network Replacement

The first modem uses an internal timing source and supplies the
timing for the entire system. The first G.703 recovers the timing and
clocks the data into the FIFO. The Tx of the first modem takes its
internal clock and sends it (TXCLK1) to the G.703 FIFO for data
(TXD1). The Rx of the second modem recovers the clock and pres­ents a “jittery” clock and data to the second G.703’s transmitter. It 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 sends the second
modem’s recovered clock (TXCLK1) to the G.703 FIFO for data
(TXD1). The Rx of the first modem uses its internal clock (RXCLK1) to
send data (RXD1) into the FIFO. The Tx of the first G.703 smooths
the first modem’s recovered timing and sends it to the FIFO for data.

Both G.703 interfaces are in Modem Timed mode. See Figure 2

above.

2.4 TIMING MODE SELECTIONS

Based on the timing arrangements and clock sources mentioned
above, there are two timing modes in which the interface can work.
These two modes select the clock sources mentioned above and
determine which clock gets smoothed.

Network Timed - This sets the interface to pass the smoothed
recovered timing to the modem as XCLK1, with the Rx data as TXD1,
and also to the G.703 Tx side.

Modem Timed - This sets the interface to use the modem’s Tx
timing (recovered or internal source) to send the Rx data (as TXD1) to
the modem and to smooth the modem’s recovered timing for transmit­ting on the G.703 Tx side.

In both cases, the transmitter uses the smoothed clock.

2.5 OPERATING MODE SELECTIONS

There are two data modes in which the interface passes data and
timing:

Octet Mode - Data is passed at a 128K rate. This mode pre­serves the byte integrity associated with Octet timing. The Octet tim­ing frame is embedded in the data.

Clear Channel Mode - Data is passed at a 64K rate. This does
not preserve the byte integrity associated with Octet timing. Instead,
an Octet timing alarm (on or off) is passed over the modem similar to
the way signaling leads are passed.

5 6

Figure 2. Network Replacement 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 ­INTERNAL

TIMING

G.703 INTF-

MODEM

TIMED MODE

CSU
DTE

G.703 TX

SMOOTHS

RX MODEM

CLOCK

G.703 TX SMOOTHS

RX MODEM CLOCK

3.0 CONFIGURATION

The Model IM 1/F is equipped with four DIP switches that allow
configuration of the unit to match your application. These DIP switch­es are located on the top side of the module. Refer to Figure 3 below
for a description of the DIP switches location on the module and a
summary table detailing their settings.

The following table defines the possible configurations of the IM
1/F using the configuration DIP switch, S1. Factory defaults are in
bold-face.

Switch

On Off

S1-1 Modem Timed Network Timed

S1-2 Not Used Not Used

S1-3 Clear Channel Mode Octet Mode

S1-4 Normal Operation Reserved for Factory

Use

NOTE: S1-4 must be “On.”

7

Figure 3: Top Side of IM 1/F, Dip Switch Location

4.0 INSTALLATION

Once the Model IM 1/F is properly configured, it is ready to install into a
PE 1090 or 1092. This section tells you how to properly connect the Model IM
1/F.

4.1 CONNECTION TO THE MODEM’S SERIAL PORT

The QuickConnect

TM

module has a 50 pin card edge connector on
one side and an RJ-45 connector on the other side. Figure 4 shows
how a QuickConnect

TM

module plugs into the back of a Patton

Electronics Model 1090 or Model 1092.

4.2

CONNECTION TO THE TWISTED PAIR INTERFACE

The Model IM 1/F supports communication between itself and a
G.703 PCM network at distances up to 4,000 feet (1219m) using 24
AWG twisted pair cable.

To function properly, the Model IM 1/F requires two twisted pairs
of metallic wire. These twisted pairs must be unconditioned, dry metal­lic wire, between 22 and 26 AWG (0.4mm to 0.6mm diameter solid
conductors). Higher gauge wire may limit distance. Flat modular tele­phone type cable is not acceptable.

8

Figure 4. Installation of Model IM 1/F Plug-in Serial Interface Module

4 3 2 1

Off
On

Line

Interface Port

1 ON

0 OFF

The RJ-45 connector on the Model IM 1/F twisted pair interface is
pre-wired according to the signal/pin relationships shown in Figure 5
below.

Important: Connection of the Patton G.703 IM to a CSU

DTE requires a crossover twisted pair cable. Connection of the G.703

IM to a PCM network requires a straight through twisted pair cable.
If you need more assistance with cable selection and preparation, contact
Patton Technical Support at [phone]. Additional assistance at
our website, http://www.patton.com, or at our e-mail address at sup-
[e-mail].

APPENDIX A

SPECIFICATIONS

Applications: 64K G.703 codirectional PCM network

extension or network replacement

Connector: Symmetrically balanced pair, 4 wire RJ-45

female

Interface: Entire module plugs into Patton Electronics

1090 or 1092 Modem

Operating
Modes/Speed: Supports octet mode or clear channel mode

Co-directional timing, Rx recovered:
64Kbits +

500ppm

Octet Timing auto detect on receiver

Line Coding: AMI with block violation for octet timing
Timing Modes: Supports network timing mode or modem

timing mode

Transmit Level: 2.0V differential, into 100 Ohms, nominal
Load Impedance: 120 Ohms
Input Signal Level: 0 to -10dB
Jitter Performance: CTR 14, G.823. <0.05UI jitter for network

extension applications

Isolation: 2000 VRMS isolation, transformer coupled
PC Board 2.950” X 3.200”, QuickConnect

TM

Interface

Dimensions: Module size
Compliance: FCC Class A

EN 50081-1, Emissions
EN 50082-1, Susceptibility
Designed for compliance with CTR 14

9 10

1 (RX Tip)
2 (RX Ring)
3 (N/C)
4 (TX Ring)
5 (TX Tip)
6 (N/C)
7 (N/C)
8 (N/C)

1
2
3
4
5
6
7
8

Pin Signal Name Direction Function

(In reference to IM)

1 RD(T) IN Receive data in (tip)
2 RD(R) IN Receive data in (ring)
3 Not used
4 TD(R) OUT Transmit data out (ring)
5 TD(T) OUT Transmit data out (tip)
6 Not used
7,8 Not used

Figure 5. Model IM 1/F Twisted Pair Interface Signal/Pin Relationship