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3. Configuration Options
3-34 December 2002 9000-A2-GB31-00
Monitor DTR
Possible Settings: Enable, Disable
Default Setting: Enable
Specifies whether the state of the DTE Ready (DTR) circuit on the user data port will be
used to determine when valid data communication is possible with the DTE. When this
condition is detected, an alarm is generated, LMI is declared down, and no further transfer
of frame relay data can occur on this interface.
Enable – Interchange circuit CD (ITU 108/1/2) – DTR is monitored to determine whether
data should be transmitted to the DTE.
Disable – DTR is not monitored. DTR is assumed to be asserted and data is being
transmitted, regardless of the state of the lead.
Port (DTE) Initiated Loopbacks
Possible Settings:
For Port-1, or Port-2 when Port Use is set to Frame Relay: Disable, Local
For Port-2 when Port Use is set to Synchronous Data: Disable, DTPLB, DCLB, Both
Default Setting: Disable
Possible Settings: Local, Disable
Default Setting: Disable
For Port-1, or Port-2 (9128 only) when Port Use is set to Frame Relay:
Allows a local external DTE Loopback to be started or stopped via the data terminal
equipment attached to the port’s interchange lead LL (ITU 141), as specified by V.54.
Disable – The DTE attached to the port cannot control the local external DTE Loopback.
Local – The DTE attached to the port controls the local external DTE Loopback.
For Port-2 (9128 only) when Port Use is set to Synchronous Data:
Allows local Data Terminal Loopbacks (DTPLBs) and remote Data Channel Loopbacks
(DCLBs) to be controlled by the DTE connected to this port.
Disable – The DTE attached to the port cannot control Local Data Terminal Loopbacks
(DTPLBs) and remote Data Channel Loopbacks (DCLBs).
DTPLB – The DTE attached to the port controls DTPLBs via circuit LL – CCITT 141, as
specified by V.54. The port remains in loopback as long as the circuit stays on.
DCLB – The DTE attached to the port controls DCLBs via circuit RL – CCITT 140, as
specified by V.54. The far-end equipment must support inband V.54 loopbacks.
Both – The DTE attached to the port controls both local DTPLBs and remote DCLBs.
Table 3-15. V.35 Data Port Physical Interface Options (4 of 6)