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42 System components
PRI Gateway span usage
The PRI Gateway allows flexible configuration DCH interface and
B-channels on the E1/T1 card.
For some interface types, the PRI Gateway also supports a nB+D feature by
having a single D-channel interface (attached with DDCH daughterboard)
support several E1/T1 spans. Therefore, it is possible that one span is not
configured with any DCH interface but is used for B-channels which are
served by D-channel interface defined in another span.
The following rules and recommendations apply to the span usage of the
PRI Gateway and for the D-channels and B-channels as well:
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usage of the E1/T1 card" (page
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Media Gateway 1000E PRI Gateway Installation and Commissioning
Copyright © 2007, Nortel Networks
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Each PRI Gateway span can be configured as E1 or T1.
DCHI supporting DPNSS/DASS protocol can be used with E1 spans
only and not with T1s.
DCHI daughterboards supporting DPNSS/DASS protocol can be used
only on spans 2, 4, 6, and 8. Spans 1, 3, 5 and 7 do not support DCHI
daughterboard DPNSS/DASS.
The onboard DPNSS/DASS protocol can be used on all spans (1, 2,
3, 4, 5, 6, 7 and 8).
DDCH daughterboard port 1 can be used only on spans 2, 4, 6 and 8.
DDCH daughterboard port 0 can be used only on spans 1, 3, 5 and 7.
Each span can be used for B-channels (BCH) solely without any
attached DCH daughterboard.
With the use of a DCHI daughterboard, the even span only can be used
as a DCH interface. However, the odd span can be used for BCH served
by a DCH interface that is controlled by another DCH span.
With the use of a DDCH daughterboard, a DCH interface can be defined
on any span. However, if one of the spans is not used for a DCH
interface, it can be used for BCHs served by a DCH interface that is
controlled by another DCH span.
With the use of onboard DPNSS/DASS protocol, a DCH interface can
be defined on any span. However, if one of the spans is not used for a
DCH interface, it can be used for BCHs served by a DCH interface that
is controlled by another DDCH span.
Table 9 "DCH interfaces (including DPNSS/DASS) and B-channel
BCH indicates B-channel is used in the span.
DDCH0 indicates PRI D-channel of port 0 in the DDCH daughterboard
is used in the span.
Nortel Communication Server 1000
NN43041-311 01.01 Standard
Release 5.0 30 May 2007
43). In this table:
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