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Administration and Provisioning
8-22 Issue 3 June 2001
Cross-Connection Provisioning 8
The DDM-2000 OC-3 Multiplexer can be provisioned for cross-connect routing of
signals. In some applications, STS-1 or VT1.5 signal cross-connections may be
established to route traffic in a specific manner. All cross-connections are bidirectional.
Any STS-1 or VT1.5 signal may be cross-connected to a like signal with an available
time slot, with some restrictions. Any STS-1 or VT1.5 signal between the main slot and
any function unit slot may be cross-connected. Any single STS-1 or any VT1.5 channel
in function units A or B may be cross-connected to any available time slots in function
unit C when function unit C is equipped with OLIUs. Also, STS-1 and VT1.5 signals
terminating on 27G2-U OLIUs installed in function units may be hairpin connected.
STS-1 and VT1.5 signals may be cross-connected in several ways. For bidirectional
drop services, the normal (default) "two-way" cross-connection is used to connect a like
signal in the high-speed main slot to any available time slot in any function unit
equipped with low-speed STS1E, DS3, or DS1 circuit packs. For bidirectional hub
applications at a ring node, the normal (default) "two-way" cross-connection is used to
connect a like signal in the high-speed main slot to any available time slot in either the
A, B, or C function unit, which has been equipped with OLIU circuit packs. The
bidirectional pass-through service is used to connect the high-speed signal from one
side of the ring to the other side. Both rings are connected using a single "two-way"
(ent-crs) command. The high-speed time slot entering must be the same leaving in
pass-through connections.
The "drop and continue" service provides, in a single command (ent-crs), the proper
bidirectional cross-connection to "drop" a copy of the high-speed signal in the main slot
to any available time slot in any function unit and to "continue" the signal on the high-
speed channel to the next node. The same command also properly drops the signal
from the opposite ring direction.
The DDM-2000 OC-3 Multiplexer ring system has one cross-connect mode of
operation, “manual.” Any cross-connect command may be implemented at each
individual site in a network through the CIT connection or at any site via a remote login
session from any other site.
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