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4. Configuration Options
9128-A2-GB20-80 September 2002
4-41
Port (DTE) Initiated Loopbacks
Possible Settings:
When Port-1 or Port Use is set to Frame Relay:
Disable, Local
When Port-2 or Port Use is set to Synchronous Data:
Disable, DTPLB, DCLB, Both
Default Setting: Disable
Possible Settings: Local, Disable
Default Setting: Disable
When Port-1 or 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.
When Port-2 or 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.
Display Conditions
– This option does not appear when Port Type is set to X.21.
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.
Invert Transmit and Receive Data
Possible Settings: Enable, Disable
Default Setting: Disable
Specifies whether transmitted and received data for the synchronous data port is logically
inverted before being transmitted or after being received from the network. Use this
configuration option for applications where data is being transported using HDLC protocol,
whereby inverting the data ensures that the ones density requirements for the network are
met.
Display Conditions
– This option only appears for Port-2 on a FrameSaver SLV 9128-II,
when Port Use is set to Synchronous Data.
Enable – Inverts the transmitted and received data for the port.
Disable – Does not invert the transmitted and received data for the port.
Table 4-7. Data Port Physical Interface Options (4 of 5)