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SDCP Operation
3-16
3166-A2-GB20-10
November 1998
Enabling the Communication Port
Communication between the 3166 DSU/CSU and an external PC, ASCII device,
SNMP manager, or async terminal interface (attached either locally or through an
external modem) occurs through a communication (COM) port. Once the COM
port is enabled, other COM port configuration options can be selected.
" Procedure
To enable the COM port:
1. From the top-level menu screen, select Cnfig.
2. Select the configuration option set to be copied into the Edit area by using the
appropriate Function key. Use the scroll keys, if necessary.
3. Select Edit.
4. From the Edit screen, press the
key until the User selection appears on
the screen.
5. Select User.
F1
Edit:
Chan Gen User
F2
F3
6. Press F1 (Next) until the Com Port configuration option appears.
7. Select Enab to enable the COM port.
F1
Com Port:
Next Enab Disab
F2
F3
The carrier COM port provides the following functionality:
H If configured for ASCII, only one ASCII device may be used for the carrier. (If
two COM ports are configured for ASCII, neither will work.)
H If configured for Mgmt, each device in the carrier can support a Mgmt COM
port; however, each Mgmt COM port must be connected to a different subnet.
To facilitate IP data routing, the device with the closest link to the SNMP
manager or Telnet client should be configured as the IP Bus Master.
H If configured for either ASCII or Mgmt, the carrier COM port may be
configured to control an external device (e.g., modem, x.25 PAD) through the
use of AT or user-specified commands.