Schmid Watson - Single-Pair Fallback; Table 3-1: Naming of DSL Spans, Pairs and Connection Points

Watson-Ethernet-Manual.doc
Version 3.3-01
Watson Ethernet
Operating Manual
Revision: 2010-01-20
3-3
Depending of the operation mode of the Watson Ethernet plug-in (which is set by
the Monitor command CARDMODE, cf. 7.2.1) the following combinations are
possible:
CARDMODE
Spans
Wire
pairs
Connection Points
1
DSL1
DSL2
DSL3
DSL4
A
A
A
A
a1, a2
b1, b2
c1, c2
d1, d2
2
DSL1
DSL3
A, B
A, B
a1, a2, b1, b2
c1, c2, d1, d2
3
DSL1
DSL3
DSL4
A, B
A
A
a1, a2, b1, b2
c1, c2
d1, d2
4
DSL1
A, B, C, D
a1, a2, b1, b2 c1, c2, d1, d2
Table 3-1: Naming of DSL spans, pairs and connection points
3.1.3 Single-pair fallback
The Watson Ethernet plug-in supports single-pair fallback on multipair DSL
spans.
Should a failure occur on a multipair span then the modem will attempt to re-
connect using one of the existing wire pairs; which one will be used is random.
The remaining spans are blocked and do not carry any traffic.
If a failure occurs on a fallback wire pair the modem will attempt to switch to
another of the wire pairs.
The single-pair fallback mode is cleared by issuing a RESET DSLx Monitor
command.
Single-pair fallback can be enabled/disabled with the FALLBACK Monitor com-
mand and by SNMP.
Notes:
 Single-pair fallback is only supported between two plug-in modems
 The fallback process is controlled by the STU-C modem. The STU-R adapts
automatically to fallback and does not need any configuration..