Nortel Networks NTRN10AN, 3500 manual 18Operation, administration, and maintenance OAM features

2-18Operation, administration, and maintenance (OAM) features

Figure 2-5

BLSR ring switch example

							EX1231p
		2			W
			4		P	3
					P
					W
		W	P		W	P
			P	W	W	P	W
			1		P	2
					P
					W
		3			Short path
					SD/3/4/S/RDI
					W
			4		P	3
					P
					W
		W	P		W	P
Legend			P	W		P	W
					W
		Add/drop multiplexer
					P
	P		1			2
		One fiber divided into			P
	W
		working and protection			W
		bandwidth			Long path
W	= Working traffic				SD/3/4/L/idle
P	=	Protection traffic

OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004