Nortel Networks OPTera Metro 3500 - Manual (Page 71)

Operation, administration, and maintenance (OAM) features 2-33
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Figure 2-15
STS BLSR with VT assignment support with VTX-48 or VTX-48e circuit pack (example)
EX1244p
DS1
OC-48 OC-48
DS1
OC-48 OC-48
OC-48 OC-48 OC-48 OC-48
Network Element A
(DS1 add/drop)
Network Element D
(protection pass-through)
(see Note)
Network Element B
(working pass-through)
Network Element C
(DS1 add/drop)
2WAY
2WAY
2WAY
From
DS1
slot :4
port :1 OC-48
slot :11
STS-1 :1
VTG :1
VT1.5 :1
To
From
OC-48
slot :12
STS-1:1 OC-48
slot :11
STS-1 :1
To
From
DS1
slot :6
port :7 OC-48
slot :12
STS-1 :1
VTG :1
VT1.5 :1
To
4 11 12
11 12 11 12
6 11 12
Legend
= Fiber pair (duplex)
= Cross-connect
= Working channel
= Protection channel
Note: There is no need to provision a cross-connect for a protection
pass-through connection in a BLSR ring.