Configuration Option Tables
A-11
7110-A2-GB20-00
June 1997
Table A-4.
Data Port Options (3 of 3)
Network Init. Data Channel Loopback
Possible Settings: Disable, V.54, FT1, Both
Default Setting: Disable
Allows the initiation and termination of a Data Channel Loopback (V.54 loop 2) by the
receipt of a V.54 DCLB-actuate sequence or DCLB-release sequence from the network
or far-end device. The sequences may be either V.54 or FT1 (ANSI) compliant
sequences.
Disable – Ignores the DCLB-actuate and DCLB-release sequences for this port.
V.54 – Enables DCLB-actuate and DCLB-release sequences that comply with the
V.54 standard for ‘‘Inter-DCE signaling for point to point circuits.”
FT1 – Enables DCLB-actuate and DCLB-release sequences that comply with the ANSI
T1.403, Annex B standard for ‘‘In-band signaling for fractional-T1 (FT1) channel
loopbacks.”
Both – Enables DCLB-actuate and DCLB-release sequences that comply with either
the ANSI or V.54 standard. The type of actuate and release sequences do not have to
match.
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 the synchronous data
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.
Monitor DTR
Possible Settings: Disable, Enable
Default Setting: Enable
Indicates whether or not the DSU/CSU monitors the Interchange Circuit CT208 (DTR)
from the DTE.
Disable – DTR is not monitored. This option is used to support certain DTEs that do not
provide the DTR lead at the interface.
Enable – DSU/CSU monitors the state of the DTR on the Data Port interface. The DTR
circuit triggers a link Up/Down SNMP Trap and is displayed on the System and Test
Status screen.
