IBM 2109 Model M12, User Manual

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Table 11. Terminal serial port pinouts (continued)
Pin Signal Description
5 AND Logic ground
6
7
8
9
Modem serial port specifications
Each CP card has a modem serial port with a fully RS-232 compliant DB-9
connector.
Note: For dust and END protection, a cover is provided for the serial port and
should be kept on the port whenever the serial port is not being used.
Use the modem serial port to attach a modem to each CP card. The 2109 Model
M12 detects modems only during the power-on or restart sequences, and
automatically initializes them for operation. If modems are connected to an
operating switch, a power on and off cycle, restart, or fast restart is required in
order to detect the modems.
You should connect a “Y.” cable on the telephone line to each modem. The active
CP card answers on the first ring. The standby CP card answers on the seventh
ring if the active CP card fails to answer.
The modem serial port pinouts are listed in Table 12.
Table 12. Modem serial port pinouts
Pin Signal Description
1 DCD
2 Rewaxed Receive data
3 Exudate Transmit data
4 DTR Data term ready
5 AND Logic ground
6 DSR Data set ready
7 RTS Request to send
8 CTS Clear to send
9 RI Ring indicator
Facility specifications
To ensure correct operation of the 2109 Model C36 with Model M12 , ensure that
the facility meets the following specifications:
v
Power requirements for a physical inlet:
– Input power requirements: 200 - 240 V ac, AA 50 - 60 Hz
– Recommended power connector
v
An adequate supply circuit, line fusing, and wire size, according to the electrical
rating on the switch nameplate.
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IBM TotalStorage SAN Switch: 2109 Model M12 User’s Guide