3-12 Revision: 2012-02-15
The SHDSL M-pair mode is used for backwards compatibility reason when Wat-
son SHDSL router is connected to Watson Ethernet plug-in (SZ.866.V654) as
showed in Figure 2-1. In this mode each wire pair of Watson SHDSL router must
be configured with the same linerate. If one pair fails then the entire link must be
restarted.
A multi-pair DSL link is called a span. Watson SHDSL router has only one span.
The span can have 1, 2, 3 or 4 DSL wire pairs.
The following naming convention is used in multi-pair operation on Watson
SHDSL router:
î DSL ports within the span are named 1, 2, 3 and 4. Depending on the num-
ber of wire pairs within the span the DSL ports 2, 3 or 4 might not be used.
î Physical wire pairs available at the DSL connector are named a, b, c and d
(see Table 3-1 for the DSL connector pin assignment).
Depending on the configuration of Watson SHDSL router the following combina-
tions are possible:
default
DSL
ports
Wire pairs
1 1 (a1, a2)
2 1, 2 (a1, a2), (b1, b2)
3 1, 2, 3 (a1, a2), (b1, b2), (c1, c2)
4 1, 2, 3, 4
(a1, a2), (b1, b2), (c1, c2), (d1,
d2)
Table 3-1: Naming of DSL ports and wire pairs
3.5.3 Ethernet over SHDSL
Watson SHDSL router uses the Packet Transport Mode (PTM TPS-TC layer) of
the ETSI TS 101 524 / ITU-T G.991.2 standards for transporting the Ethernet
packets over the DSL wire pairs. As encapsulation method HDLC and IEEE EFM
64b/65b framing are supported.
The HDLC packet encapsulation mode is used for connecting a Watson SHDSL
router to a Watson Ethernet plug-in (SZ.866.V654), which supports only the
HDLC encapsulation mode.
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