363-206-295
Transmission and Synchronization Interfaces
Issue 1
December 1997
5-5
Figure 5-2.
OC-3/OC-12 Ring (0x1) Low-Speed Interfaces — Single Homing
O
L
I
U
TSI
21-Type
OLIUS
O
L
I
U
DDM-2000 OC-12 Shelf
DDM-2000 OC-3 Shelf
DS1/DS3/EC-1/OC-3
Main-1
22-Type OLIU
Main-2
22-Type OLIU
Ring
1
Ring
2
Ring
1
Ring
2
FN ( )-1
FN ( )-2
Main B-2
Main B-1
OC-3
OC-3