Lucent Technologies DDM-2000 OC-3 User Manual

363-206-285
Applications
2-40 Issue 3 June 2001
Hairpin Local Drop Routing 2
Figure 2-26 shows hairpin local drop routing. In this configuration, path-protection
switched drop cross-connections are established between channels on an OC-1
ring and ports/channels on DS1/EC1/OC-3 circuit packs. The OC-1 facility
terminates on a pair of 27G2-U OLIU circuit packs in a function unit. These
connections are just like the drop cross-connections that can be established
between channels on a ring terminating on the main slots and ports or channels in
a function unit. This allows traffic to be routed from a FiberReach node on an
OC-1 ring to a local drop without using bandwidth on the OC-3/OC-12 ring.
A mix of the enhanced routing services shown in Figure 2-23, Figure 2-24,
Figure 2-25, and Figure 2-26 can be created in a single DDM-2000 FiberReach
host. 27G2-U OLIUs are needed for these services.
Beginning with Release 13.0, the single OC-1 26G2-U OLIU, with built-in
multiplexer capabilities, further expands the options by allowing the dropping of
DS1s without the need for the MXRVO or BBF5 Jumper circuit packs (a Group 4
shelf is required).
Figure 2-26. Hairpin Local Drop Routing
RT HOST NODE
DDM-2000/
OC-3/OC-12
SLC
R
-2000
RT HOST NODE
DDM-2000/
SLC
R
-2000
DDM-2000/
SLC
R
-2000
CENTRAL OFFICE
DS1/EC-1/IS-3/OC-3
DDM-2000
FiberReach
DDM-2000
FiberReach
OC-1
DS1/T1
DS1/EC-1/
IS-3/OC-3

Lucent Technologies DDM-2000 OC-3 Specifications

General

Brand	Lucent Technologies
Model	DDM-2000 OC-3
Category	Multiplexer
Language	English