Operation, administration, and maintenance (OAM) features 2-23

Figure 2-10

BLSR ring switch example

 

 

 

 

 

 

 

 

 

EX1243p

 

 

Node 3 and 4 state change detail

 

 

 

 

 

 

 

 

 

 

 

 

W

 

 

 

Bridged

 

 

 

 

P

 

 

 

state

 

 

 

P

 

 

 

 

 

 

 

 

 

W

 

 

 

 

 

 

 

W

P

 

 

 

 

 

 

 

 

 

P

W

 

 

 

 

 

Bridged and

 

 

 

W

 

 

 

Switched

 

 

 

 

 

 

 

 

state

 

 

 

P

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W

 

 

 

 

 

 

 

W

P

 

 

 

 

 

 

 

 

 

 

 

Totally

 

 

 

 

 

 

 

 

decoupled

 

 

 

 

 

 

P

W

 

 

 

 

9

'Bridged and

 

'Bridged and

 

 

Switched' state

 

Switched' state

 

 

 

 

 

 

 

W

 

 

 

 

 

 

4

P

 

P

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W

 

 

 

 

 

 

 

W

P

 

 

W

P

 

Legend

 

 

 

 

 

 

 

 

 

 

 

Add/drop multiplexer

 

P

W

 

W

P

W

 

 

 

 

 

 

 

 

 

 

P

One fiber divided into

 

1

 

 

P

2

 

 

W

 

P

 

 

 

working and protection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

bandwidth

 

 

W

 

'Pass-through'

 

 

 

'Pass-through'

 

W

=

Working traffic

 

state

 

Long path

state

 

P

=

Protection traffic

 

 

SD/4/3/L/bridged and switched

 

 

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

Page 61
Image 61
Nortel Networks 3500, NTRN10AN manual State Protection traffic