Patton electronic Network Card IM 1 F User Manual

USER  
MANUAL  
MODEL IM 1/F  
G. 703 Interface Module  
Part# 07MIM1F-B  
Doc# 090071UB  
Revised 08/10/99  
SALES OFFICE  
(301) 975-1000  
TECHNICAL SUPPORT  
(301) 975-1007  
 
2.0 GENERAL INFORMATION  
2.3.1 APPLICATIONS AND ASSOCIATED TIMING  
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.  
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.  
2.1 FEATURES  
• Designed for use with Patton Electronics Access products that  
TM  
receive QuickConnect 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.  
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.  
G.703 TX  
SMOOTHS  
RX MODEM  
CLOCK  
HOST  
MODEM -  
RECOVERED  
TIMING  
G.703 INTF-  
MODEM  
TIMED MODE  
• Made in the U.S.A.  
2.2 DESCRIPTION  
RX  
TX  
TX  
RX  
TX  
FIFO  
FIFO  
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 con-  
nector style (see note, below). The G.703 network provides a 64K co-  
directional 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.  
G.703  
RX  
CSU  
DTE  
SECOND MODEM  
FIFO  
RX  
TX  
RX  
RX  
2 or 4 Wire  
G.703  
FIFO  
TX  
TX  
2.3 SYSTEM DESCRIPTION  
SMOOTHED  
This section describes the features that the entire system (G.703  
interface, combined with the modems) will support.  
NETWORK  
FIRST MODEM  
HOST  
G.703 INTF-  
NETWORK  
TIMED MODE  
MODEM -  
INTERFACE  
(EXTERNAL)  
TIMING  
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.  
Figure 1. Network Loop Extension Configuration  
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4
 
The first G.703 interface is in Network Timed mode. The second is in  
Modem Timed mode. See Figure 1 above.  
Both G.703 interfaces are in Modem Timed mode. See Figure 2  
above.  
Timing of Application 2: Network Replacement  
2.4 TIMING MODE SELECTIONS  
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 pres-  
ents 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.  
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.  
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.  
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 transmit-  
ting on the G.703 Tx side.  
G.703 TX  
SMOOTHS  
RX MODEM  
CLOCK  
HOST  
MODEM -  
RECOVERED  
TIMING  
G.703 INTF-  
MODEM  
TIMED MODE  
In both cases, the transmitter uses the smoothed clock.  
2.5 OPERATING MODE SELECTIONS  
TX  
RX  
TX  
FIFO  
FIFO  
RX  
TX  
There are two data modes in which the interface passes data and  
timing:  
G.703  
RX  
Octet Mode - Data is passed at a 128K rate. This mode pre-  
serves the byte integrity associated with Octet timing. The Octet tim-  
ing frame is embedded in the data.  
CSU  
DTE  
SECOND MODEM  
G.703 TX SMOOTHS  
RX MODEM CLOCK  
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.  
FIFO  
TX  
RX  
RX  
RX  
TX  
G.703  
2 or 4 Wire  
FIFO  
TX  
SMOOTHED  
CSU  
DTE  
HOST  
FIRST MODEM  
G.703 INTF-  
MODEM  
TIMED MODE  
MODEM -  
INTERNAL  
TIMING  
Figure 2. Network Replacement Configuration  
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3.0 CONFIGURATION  
4.0 INSTALLATION  
The Model IM 1/F is equipped with four DIP switches that allow  
configuration of the unit to match your application. These DIP switch-  
es 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.  
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  
TM  
The QuickConnect module has a 50 pin card edge connector on  
4
3
2
1
Off  
On  
one side and an RJ-45 connector on the other side. Figure 4 shows  
TM  
how a QuickConnect module plugs into the back of a Patton  
Electronics Model 1090 or Model 1092.  
ne  
Figure 3: Top Side of IM 1/F, Dip Switch Location  
Interface Port  
The following table defines the possible configurations of the IM  
1/F using the configuration DIP switch, S1. Factory defaults are in  
bold-face.  
1 ON  
0 OFF  
Switch  
On  
Off  
Figure 4. Installation of Model IM 1/F Plug-in Serial Interface Module  
S1-1  
S1-2  
S1-3  
S1-4  
Modem Timed  
Not Used  
Clear Channel Mode  
Normal Operation  
Network Timed  
Not Used  
Octet Mode  
Reserved for Factory  
Use  
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.  
NOTE: S1-4 must be “On.”  
To function properly, the Model IM 1/F requires two twisted pairs  
of metallic wire. These twisted pairs must be unconditioned, dry metal-  
lic wire, between 22 and 26 AWG (0.4mm to 0.6mm diameter solid  
conductors). Higher gauge wire may limit distance. Flat modular tele-  
phone type cable is not acceptable.  
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8
 
APPENDIX A  
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.  
SPECIFICATIONS  
Applications:  
Connector:  
Interface:  
64K G.703 codirectional PCM network  
extension or network replacement  
1 (RX Tip)  
2 (RX Ring)  
3 (N/C)  
4 (TX Ring)  
5 (TX Tip)  
6 (N/C)  
1
2
3
4
5
6
7
8
Symmetrically balanced pair, 4 wire RJ-45  
female  
Entire module plugs into Patton Electronics  
1090 or 1092 Modem  
7 (N/C)  
8 (N/C)  
Operating  
Modes/Speed:  
Supports octet mode or clear channel mode  
Co-directional timing, Rx recovered:  
64Kbits + 500ppm  
Pin  
Signal Name  
Direction  
Function  
(In reference to IM)  
Octet Timing auto detect on receiver  
1
2
RD(T)  
RD(R)  
IN  
IN  
Receive data in (tip)  
Receive data in (ring)  
Not used  
Line Coding:  
AMI with block violation for octet timing  
3
4
5
6
TD(R)  
TD(T)  
OUT  
OUT  
Transmit data out (ring)  
Transmit data out (tip)  
Not used  
Timing Modes:  
Supports network timing mode or modem  
timing mode  
7,8  
Not used  
Transmit Level:  
2.0V differential, into 100 Ohms, nominal  
Load Impedance:  
Input Signal Level:  
Jitter Performance:  
120 Ohms  
0 to -10dB  
Figure 5. Model IM 1/F Twisted Pair Interface Signal/Pin Relationship  
Important: Connection of the Patton G.703 IM to a CSU  
CTR 14, G.823. <0.05UI jitter for network  
extension applications  
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 (301) 975-1007. Additional assistance at  
our website, http://www.patton.com, or at our e-mail address at sup-  
Isolation:  
2000 VRMS isolation, transformer coupled  
TM  
PC Board  
Dimensions:  
2.950” X 3.200”, QuickConnect Interface  
Module size  
Compliance:  
FCC Class A  
EN 50081-1, Emissions  
EN 50082-1, Susceptibility  
Designed for compliance with CTR 14  
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