Connecting a RAN to a 128-Port Asynchronous Adapter

This procedure allows you to connect a remote asynchronous node (RAN) to a 128-port asynchronous adapter. The connection between the 128-port adapter and the RAN can be as follows:

• Direct attachment
• Remote attachment using synchronous modems (EIA 232 or EIA 422)

Prerequisites

1. A 128-port asynchronous adapter must be defined and available to the system.
2. The power switch on the RAN must be in the Off (O) position.

Connect First Local RAN Directly to 128-Port Asynchronous Adapter

1. Connect the male end of an IBM PN 43G0937, or identical cable to line 1 of the 128-port adapter.

   See "128-Port Asynchronous Adapter Cable Specifications and Cabling Scenarios" for cable wiring information.

2. Connect the female end of the cable to the RAN port marked IN.
3. Install the terminator plug on the OUT/T port of the RAN.
4. Plug the AC connector of the power supply (US IBM PN 40H3611, or PN 93H7091 for the enhanced RANs) into a standard grounded wall outlet. Plug the DIN connector into the receptacle labeled +5V/+-12V on the RAN.
5. Turn the RAN's power switch to the On (|) position. The lights on the front panel should flash as the RAN executes its power-on self-test (POST) sequence, and the seven-segment LED display will display P1 to indicate that the POST sequence has completed successfully.

   The display will show AC to indicate that it is online or active and has received instructions from the adapter.

6. Set the node number. Refer to "Setting a RAN Node Number" for instructions.
7. Reconfigure the adapter by running cfgmgr -l cxia0, cxma0, or cxpa0.

Connect Remote RAN to 128-Port Asynchronous Adapter via Modems

1. Connect the local EIA 232 or EIA 422 synchronous modem to one of the adapter synchronous lines using an EIA 232 or EIA 422 synchronous modem cable.
2. Connect remote EIA 232 or EIA 422 synchronous modem to the RAN port marked IN using the EIA 232 or EIA 422 synchronous modem cable.

   See "128-Port Asynchronous Adapter Cable Specifications and Cabling Scenarios" for cable wiring information.

3. Install the terminator plug on the OUT/T port of the RAN.
4. Plug the AC connector of the power supply (IBM PN 40H3611, or PN 93H7091 for the enhanced RANs) into a standard grounded wall outlet. Plug the DIN connector into the receptacle labeled +5V/+-12V on the RAN.
5. Turn the RAN's power switch to the On ( | ) position. The lights on the front panel should flash as the RAN executes its power-on self-test (POST) sequence, and the seven-segment LED display will eventually display P1 to indicate that the POST sequence passed.
6. Set the node number. Refer to "Setting a RAN Node Number" for instructions.
7. Reconfigure the adapter by running cfgmgr -l cxia0, cxma0, or cxpa0.

Add Subsequent RAN to a System (Daisy Chain)

Refer to "128-Port Asynchronous Adapter Cable Specifications and Cabling Scenarios" for further information.

Note: Each 128-port asynchronous adapter line is limited to no more than four daisy-chained RANs.

1. Using a daisy-chain cable, connect the male end of the cable to the port marked OUT/T on an existing RAN.
2. Connect the female end of the cable to the IN port on the new RAN.
3. If the new RAN is being placed in the middle of a daisy chain, connect the male end of another daisy-chain cable to the OUT/T of new RAN.
4. Connect the female end of the cable to the IN port to the next RAN.
5. Ensure that a terminator plug is on the OUT/T port of the last RAN in the chain.
6. Plug the AC connector of the power supply (IBM PN 40H3611, or PN 93H7091 for the enhanced RANs) into a standard grounded wall outlet. Plug the DIN connector into the receptacle labeled +5V/+-12V on the RAN.
7. Turn the RAN's power switch to the On (|) position. The lights on the front panel should flash as the RAN executes its power-on self-test (POST) sequence, and the seven-segment LED display will display P1 to indicate that the POST sequence passed.
8. Set the node number. Refer to "Setting a RAN Node Number" for instructions.
9. Reconfigure the adapter by running cfgmgr -l cxia0, cxma0, or cxpa0.

   Note: The new RAN can be added in the middle or at the end of the daisy chain. However, the RAN must be placed so that it can be assigned a free node number. Each RAN must have a unique node number (1n-4n) assigned in ascending order with the lowest number assigned closest to the adapter.