Lucent Technologies DDM-2000 OC-3 User Manual

363-206-285
Applications
2-32 Issue 3 June 2001
The DDM-2000 drop-and-continue feature also finds an excellent application in
interconnecting two rings via an intermediate transport network. In the example
shown in Figure 2-20, DDM-2000 OC-3 Multiplexer access rings act as a DRI pair
via an FT-2000 OC-48 Lightwave System and DACS IV-2000 interoffice network.
The advantage of this network is the grooming for DRI traffic provided by the
DACS IV-2000. Both DDM-2000 OC-3 rings provide drop and continue at each of
their two duplicate COs. Both copies of the signal are transported as separate
tributaries through the interoffice network, and path switching is implemented at
the edges of the network. Signal redundancy is preserved on an end-to-end basis.
In offices where SONET interconnections are not available, DS3 interfaces can be
used between dual OC-12 offices. This architecture is not recommended over the
all SONET architecture, since DS3 interface failures are potentially service
affecting.
Figure 2-20. DDM-2000 Ring Interworking with FT-2000 OC-48 Lightwave System Transport
and DACS IV-2000 Grooming
DDM-2000
DS1
DS3
OC-3
OC-3
OC-3
OC-3/12
OC-3/12OC-3/12
OC-48
OC-48
DDM-2000
DDM-2000
DDM-2000
DDM-2000
DDM-2000
DDM-2000
DACS IV-2000 DACS IV-2000
DACS
IV-2000
DACS
IV-2000
FT-2000 FT-2000
EC-1
EC-1
FT-2000
FT-2000
Access Ring
DS1
DS3
EC-1
EC-1
DS3
DS1
Drop & Continue
Drop & Continue
Customer
DS1/DS3
From
Async
systems
R
DDM-2000/
SLC -2000
VT1.5 (DS1)
packing/
grooming
OC-3/12
OC-3/12
OC-3/12
OC-3/12
Multiple Access Rings

Lucent Technologies DDM-2000 OC-3 Specifications

General

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