363-206-295
Applications
Issue 1
December 1997
2-7
Figure 2-3 shows how DDM-2000 OC-3 and OC-12 Multiplexers can be used
together to provide a path switched ring operating simultaneously at the VT1.5,
STS-1, and STS-3c levels. This ring is especially useful for loop feeder
applications with large bandwidth needs. It can also be developed as a result of
an upgrade from an OC-3 ring in an environment where growth has exhausted the
bandwidth of the OC-3 ring.
Figure 2-3.
OC-12 Path Switched Ring Using OC-12 Multiplexer—Mixed STS-1 and
VT1.5 Path Switching
DS1, DS3, STS-1E
DACS IV-2000
5ESS Switch
DS3
DDM-Plus
T1
QUAD
DS1
DS1
ISDN
VF, DS0,
DS1
MSDT
VF, DS0, ISDN
Access
System RT
OC-12
OC-12
DDM-2000
OC-12
RT Site
Access
System RT
DDM-2000
OC-3
DS1
IS-3
IS-3
IS-3
IS-3
IS-3
IS-3
DDM-Plus
VF, DS0,
DDM-2000
DDM-Plus
OC-3
QUAD
DS1
IS-3
ISDN
T1
QUAD
DS1
DS1
MSDT
VF, DS0, ISDN
OC-12
Customer RT Site
OC-12
DDM-2000
OC-12
RT Site
Central Office
OC-12
DDM-2000
OC-3
DDM-2000
IS-3
BRT-2000
DDM-2000
OC-12
EC-1/DS3/OC-3c
EC-1/DS3/OC-3c
R
T0: SLC-2000 Series 5 COT
R
SLC -2000
SLC -2000
SLC-2000
SLC-2000
VT or STS-1 TSI