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CIRCUIT DESCRIPTION
6-44
March 1999
Part No. 001-2009-600
The input and output connectors for the MAC are
defined as follows.
6.12.13 P101 SIGNALING CONNECTOR
The signal interface connector P101 (64 pin) con-
nects the Address and Data buses and control lines to
the backplane connector. See Figures 6-24 and 6-25.
Pins 1-10 ADDRESS BUS
Pins 33-42
This provides a path between the MPC main pro-
cessor and the processor and memory of the MAC.
This bus retrieves information programmed into mem-
ory for the operation of the MAC.
Pins 11-14 DATA BUS
Pins 43-46
This data bus provides a means of transferring
data to and from the processor on the MAC with
peripheral devices in the MAC.
Pin 15 MREQ
A memory request line operates in conjunction
with the Read/Write lines. These provide the ability to
read from or write to the processor memory.
Pin 16 MSTB
This is a memory strobe line used during MAC
processor Read/Write operations to external memory.
Pins 17-20 UNUSED
Pin 21 LPTT
The Logic Push-To-Talk is not used on the MAC.
Pin 22 SWITCH TX DATA
This is the RS-232 data from the Switch. The
CIM controls the repeater with restart, enable and dis-
able, executes requests to read and write to the
repeater’s memory, and tells the repeater transmit code,
hang or send turn-off.
Pin 23 SWITCH RX DATA
This is the RS-232 data to the Switch. The CIM
receives confirmation of all requests made to the
repeater and sends information the repeater receives.
Pins 24/56 HSDB+/-
The High Speed Data Bus interconnects the
Viking VX repeaters. A 50 ohm termination is
required if Viking VX repeaters are used with existing
repeaters and the interface.
Pins 25/57 UNUSED
Pin 26 TLA DB
The Trunk Line Accounting Data Bus is used for
telephone interconnect calls.
Pin 27/59 -5V IN
This is the -5V input to the MPC from the power
supply via the Controller backplane.
Pins 28-29 +5V IN
Pins 60-61
This is the +5V input to the MPC from the power
supply via the Controller backplane.
Pins 30/62 +15V IN
This is the +15V input to the MPC from the
power supply via the Controller backplane.
Pins 31-32 GROUND
Pins 63-64
This is the ground connection to the MPC from
the power supply via the Controller backplane.
Pin 47 READ
Read is used with the MREQ line to read data
from the processor and external memory.
Pin 48 WRITE
Write is used with the MREQ line to write data to
the processor and external memory.