Making Interface Connections - Patton electronics IM2RC/F User Manual

4.3 MAKING INTERFACE CONNECTIONS

The Model IM2RC/F is designed to provide access to a 64 kbps
co-directional G.703 PCM network. Figure 5 shows the position of the
G.703 interface and the line interface of the IM2RC/F. This section
describes how to connect the G.703 interface and the line interface.
Notice!
The G.703 line surge protection on this unit was
installed for circuit protection only. By no means does this
include the preservation of signal quality during a large surge.
Figure 5: Model IM2RC/F Interface Ports
4.3.1 CONNECTING TO A G.703 PCM NETWORK CHANNEL
The 120 Ohm RJ-45 port on a Model IM2RC/F is pre-wired for
direct connection to the G.703 PCM network. Connect the RJ-45 jack
provided by your digital service carrier to the 120 Ohm G.703 interface
on the Model IM2RC/F using a straight through twisted pair cable
between 19 and 26 AWG (0.4mm to .9mm, inversely). To be sure you
have the right wiring, refer to Figure 6, below.
1
2
3
4
5
6
7
8
Figure 6: 120 Ohm RJ-45 G.703 Interface
RJ-45 Line Interface
120 Ohm RJ-45
G.703 Interface
1 (RX+)
2 (RX-)
3 (N/C)
4 (TX-)
5 (TX+)
6 (N/C)
7 (N/C)
8 (N/C)
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4.3.2 CONNECTING THE LINE INTERFACE
The Model IM2RC/F is to be used with Patton function card access
products (i.e. 1045RC, 1092RC, 1092ARC, 2500RC) that support
64k/128k synchronous data rates. There are two essential
requirements for connecting the line interface on Model IM2RC/F:
1. These units work in pairs. Both units at the end of the twisted
pair must have the proper 2-Wire/4-Wire setting. For
instance, if you are operating in 2-Wire mode, both units must
be in the 2-Wire setting. Similarly, if you are operating in 4-
Wire mode, both units must be in the 4-Wire setting. NOTE:
Currently only the 1092 and 1092A families support 2-Wire
Mode.
2. To function properly, the Model IM2RC/F needs one or two
twisted pairs of metallic wire. The twisted pairs must be
unconditioned, dry, metallic wire, between 19 (.9mm) and 26
AWG (.4mm) (Appendix B describes cable requirements) .
Standard dial-up telephone circuits, or leased circuits that run
through signal equalization equipment, or standard, flat
modular telephone type cable, are not acceptable. Figure 7,
below, shows the pin/signal relationships of the Line Interface
Port.
1
2
3
4
5
6
7
8
Figure 7: RJ-45 Line Interface
1 (4-Wire RX+)
2 (4-Wire RX-)
3 (no connection)
4 (2-Wire TIP)/(4-Wire TX+)
5 (2-Wire RING)/(4-Wire TX-)
6 (no connection)
7 (no connection)
8 (no connection)
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