11
12
4.3 MAKING INTERFACE CONNECTIONS
The Model IM2RC/F-128K 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-128K.
This section describes how to connect the G.703 interface and the line
interface.
4.3.1 CONNECTING TO A G.703 PCM NETWORK CHANNEL
The 120 Ohm RJ-45 port on a Model IM2RC/F-128K 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-128K using a straight through twist-
ed pair cable between 19 and 26 AWG (0.4mm to .9mm, inversely).
To be sure you have the right wiring, refer to Figure 6, on the following
page.
4.3.2 CONNECTING THE LINE INTERFACE
The Model IM2RC/F-128K is to be used with Patton function card
access products (i.e. 1092RC, 1092ARC, 1094ARC and 1095RC) that
support 128k synchronous data rates. There are two essential require-
ments for connecting the line interface on Model IM2RC/F-128K:
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, 1092A, and 1095 families support 2-Wire
Mode.
2. To function properly, the Model IM2RC/F-128K 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 modu-
lar telephone type cable, are
not acceptable
. Figure 7, below,
shows the pin/signal relationships of the Line Interface Port.
120 Ohm RJ-45
G.703 Interface
RJ-45 Line Interface
Figure 5: Model IM2RC/F128-K Interface Ports
Figure 6: 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)
1
2
3
4
5
6
7
8
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 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)
1
2
3
4
5
6
7
8
