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Installation
3-453000-A2-GA31-80 December 1994
Figure 3-32. Dial Network Interface Module Installation
COMSPHERE 3811 Control Interface
Connectors J1 and J2 provide an interface that can be
used to support D-lead or MI/MIC control of the
COMSPHERE 3811 modems. These two control signal
methods are identical in function in that actuation causes
the associated modem to go off-hook in the Originate
mode.
With MI/MIC signaling, two leads are provided: Mode
Indicate and Mode Indicate Common (usually via Pins 3
and 6 of an 8-position modular VF connector). Actuation
of the signal is by momentary connection of these two
leads.
With D-lead control signaling, a single signal lead is
associated with each modem. Momentary connection of
this lead to a common ground actuates the signal.
The interface provided by Connectors J1 and J2
directly support a D-lead interface. (These connectors are
defined in Table A-12.) Applications where MI/MIC
signaling is provided can be accommodated by simply
connecting all MIC leads together and wiring them to
Pin 25 (Signal Ground) on the corresponding J1 or J2
connector. Each MI lead can then be treated as a D-lead
connection.
Models 3151 and 3161 Network Interface
The Models 3151 and 3161 network interface is
provided by one 50-pin connector on the Auxiliary
Backplane on the back of the carrier. This connector
serves eight contiguous slots in the carrier: either
Slots 1–8 or Slots 9–16.