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Modem serial port specifications
Each CP card has a modem serial port (labeled RS–232) with a fully RS–232
compliant DB–9 connector.
Note: For dust and ESD protection, a cover is provided for the serial port and
You can use the modem serial port to attach a modem to each CP card. The 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.
Customers 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 17.
Fibre-channel port specifications
The fibre-channel ports in the M12 support full duplex link speeds at 2.125 Gbps or
1.0625 Gbps inbound and outbound. The ports automatically negotiate to the
highest common speed of all devices that are connected to the port. Each port has
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IBM TotalStorage SAN Switch: 2109 Model M12 Installation and Service Guide
Table 16. Pinouts with signal and description
Pin
Signal
1
2
TxData
3
RxData
4
5
GND
6
7
8
9
should be kept on the port whenever the serial port is not being used.
Table 17. Modem serial port pinouts
Pin
Signal
1
DCD
2
RxData
3
TxData
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Description
Transmit data
Receive data
Logic ground
Description
Data carrier detect
Receive data
Transmit data
Data term ready
Logic ground
Data set ready
Request to send
Clear to send
Ring indicator
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