A.2 Pcm Connection Diagrams - AMERITECH AM8a Instruction Manual

Appendix A – PCM Operations

A.2 PCM Connection Diagrams

Figures A-5 and A-6 illustrate typical connections between a user's equipment and the AM8a.
A.2.1 Monitoring Connections
Figure A-5 shows the recommended monitoring connections through series resistors
at the user's monitor jacks. If series resistors are not provided by the user,
48-0131AY cables must be used; this cable provides the necessary series resistance.
The AM8a will have no effect on the signal exchange when monitoring a circuit.
A.2.2 ANALYZE Menus
Figure A-6 shows both emulate and "drop and insert" connections. In emulate, the
unit substitutes for the "near-end" that normally would be connected via the jumpers
shown removed in the diagram. In some installations, the user's RX and TX jacks
may have contacts that break the cross connections when the test cables are plugged
in.
In rpt 1 to 2 or rpt 2 to 1 (drop and insert), the unit provides the path for all but one
T1 channel (selected by PCM CONFIG, CHANnel 1 through 24). In monitor, all signals
pass through the AM8a.
CAUTION: Connect the cables from the AM8a RX jacks and TX jacks to the DSX
jacks in the proper order to avoid "hits" that can result in alarm
messages from the network equipment.
February 10, 2000
(18-0037)
A-10
AM8a Instruction Manual
0037-S0A.L_