Operation, administration, and maintenance (OAM) features 2-21

Figure 2-8

BLSR ring switch example

EX1242p

'Bridged' state

 

 

W

 

4

P

 

P

 

 

 

 

 

 

 

 

W

W P

 

 

P W

 

W

1

P

P

 

 

 

 

 

W

'Idle' state

3

W P

P

2

W

'Pass-through'

'Pass-through'

state

state

 

Long path

 

SD/4/3/L/bridged

Legend

P

W

Add/drop multiplexer

One fiber divided into working and protection bandwidth

W= Working traffic P = Protection traffic

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004

Page 59
Image 59
Nortel Networks 3500, NTRN10AN manual EX1242p