J21 Connector; Table 3-11. Connector J21 Interconnect Signals - Motorola MVME712M Installation And Use Manual

Table 3-10. Connector J20 Interconnect Signals (Continued)
Signal
Pin Number
Mnemonic
3 DCD2
4 RXD2
5-10
11 DTR2
12 -12VMODEM
13 +5VMODEM
14-15 GND
16 +12VMODEM +12 Vdc Power - used by the internal modem.
17-20

J21 Connector

Connector J21 is the backplane modem power connector. Each pin
connection, signal mnemonic, and signal characteristic for the
modem power connector is listed in Table 3-11.

Table 3-11. Connector J21 Interconnect Signals

Signal
Pin Number
Mnemonic
1 +5VMODEM
2 +12VMODEM +12 Vdc Power - supplied by the backplane and routed
Signal Name and Description
DATA CARRIER DETECT - Sent by the modem to the
terminal to indicate that a valid carrier is being
received.
RECEIVE DATA - data that is demodulated from the
receive line is presented to the terminal by the modem.
Not used.
DATA TERMINAL READY - A signal from the terminal
to the modem indicating that the terminal is ready to
send or receive data.
-12 Vdc Power - used by the internal modem.
+5 Vdc Power - used by the internal modem.
GROUND
Not used.
Signal Name and Description
+5 Vdc Power - supplied by the backplane and routed
to J20.
to J20.
MVME712M Transition Module
3
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