Connector Pin Assignments - Nortel Circuit Card Installation Manual

Page 874 of 906

Connector pin assignments

Table 273
Connector J1 pin assignments
Pin
number Signal
1 FGD
2 TD
3 RD
4 RTS
5 CTS
6 DSR
7 GND
8 CD
20 DTR
Note 1: In DTE mode, the signals CD, DSR, and CTS are tied to +12 volts (through a resistor)
to indicate that the QSDI port is always ready to transmit and receive data.
Note 2: In DCE mode, the signals DTR, and RTS are tied to +12 volts (through a resistor) to
indicate that the QSDI port is always ready to transmit and receive data.
553-3001-211 Standard 3.00
QPC841 Quad Serial Data Interface card
Connector J1 is connected to port one, and uses the RS-232-C standard
DB-25 pinout. Connector J2 is connected to ports two, three, and four, and is
a non-standard pinout that requires an adapter cable. An adapter cable
(NT8D96) splits the J2 signals out to three standard RS-232-C connectors.
Port 2 is connected to connector A, Port 3 is connected to connector B, and
Port 4 is connected to connector C.
Table 273 shows the pinouts for connector J1, and Table 274 on
shows the pinouts for connector J2.
Purpose in DTE mode
Frame ground
Received data
Transmitted data
Request to send (not used)
Clear to send (Note 1)
Data set ready (Note 1)
Ground
Carrier detect (Note 1)
Data terminal ready
August 2005
Purpose in DCE mode
Frame ground
Transmitted data
Received data
Request to send (Note 2)
Clear to send
Data set ready
Ground
Carrier detect (not used)
Data terminal ready (Note 2)
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