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Configuration Option Tables
A-6
7975-A2-GB20-40December 1998
Table A-2. Synchronous Data Port Options (3 of 3)
Port (DTE) Initiated Loopbacks
Possible Settings: Disable, DTLB, DCLB, Both
Default Setting: Disable
Allows the initiation and termination of a local Data Terminal Loopback (DTLB) or
remote Data Channel Loopback (DCLB) by the DTE connected to this port. (DTLB is
equivalent to a V.54 loop 3, and DCLB is equivalent to a V.54 loop 2.) Control of these
loopbacks is through the DTE interchange circuits as specified by the V.54 standard.
Disable – Disables control of local DTLBs and remote DCLBs by the DTE connected to
this port.
DTLB – Gives control of the local DTLBs for this port to the DTE attached to this port.
This loopback is controlled by the Local Loopback interchange circuit LL (CCITT 141).
DCLB – Gives control of the remote DCLBs for the far-end port connected to this port to
the DTE attached to this port. This loopback is controlled by the Remote Loopback
interchange circuit RL (CCITT 140). The far-end equipment must support in-band
V.54 loopbacks.
Both – Gives control of local DTLBs and remote DCLBs to the DTE connected to this
port.
ElasticStore
Possible Settings: Disable, Enable
Default Setting: Enable
Used to enable or disable a first in first out (FIFO) buffer circuit for the incoming external
clock. This circuit is used to compensate for the differences between the frequencies of
the data clocks for the two units in the circuit. This option only applies if the unit is set
for external timing.
Disable – Disables the Elastic Store FIFO.
Enable – Enables the Elastic Store FIFO.