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Hardware Installation Procedure
2.7 Network Cabling
This section explains how to connect an InterChange iQ 2000 unit into the ISDN.
Warning:
Before attaching ISDN cables, perform any power-on configuration which may
be required to make the signalling conversion fit the particular application. Failure to
do so may cause unexpected effects on the remote equipment when the InterChange
iQ 2000 unit is connected.
2.7.1 Port Usage
At the rear of the unit are two pairs of BNC connectors (75 Ohm) marked Rx and TX, and
two RJ45 connectors (120 Ohm). There is a switch marked 75 Ohm and 120 Ohm for
changing between the connectors. PORT 1 and PORT 2 are indicated on the rear.
Port 1 presents a Q931 Protocol variant and Port 2 presents DPNSS. The exact parameters
of each protocol are configured through the off-line menus.
The sense of each connection can be changed by configuration.
2.7.2 Cabling Practice
Specimen drawings for BNC and RJ45 plug terminations will be provided on request.
Label all cables, especially 75 Ohm coax pairs, during installation. Labelling greatly eases
any trouble shooting or subsequent reconnection/re-configuration of the units.
Attach the label to each cable in an easy to read location indicating the InterChange
equipment (if there is more than one), the port it connects and its direction. For example:
1/1 TX (Q.931)
1/1 RX (Q.931)
1/2 TX (DPNSS)
1/2 RX DPNSS)
Depending on the installation, labelling may be beneficial at either or both ends of
each cable.
2.7.3 Cabling Procedure
Connect to the appropriate connectors at the rear of the unit.
When connecting cables to a live unit, connect the pair of cables attaching to Customer
Premises Equipment (CPE, e.g. PBX) before connecting to the remote network, particularly if
this is a public service network.
Cable continuity can be checked by applying a physical loop, TX to RX, at the attached
equipment.
