Nortel Networks NTRN10AN manual VT#1 UPSR, 2 way STS-1 #1 Unprotected OM3500

Operation, administration, and maintenance (OAM) features 2-179

Figure 2-66

Virtual ring (path-in-line) and shared VTmanaged STS - no VT loss in case of a fiber cut

EX1551p

	VT#1,	UPSR, 2 way
	STS-1 #1	(unprotected)
	A	OM3500	OM3500
		(W/STX)	(W/STX)
OM3500
	OC-3/12/48
	UPSR ring
OM3500	X	Working
		time slots
	C
	VT#2,
	STS-1 #1
Traffic C-D switched		Backbone
to protected path		Network
		Working
		time slots

OM3500OM3500

(W/STX)(W/STX)

Legend

UPSR, 2 way (unprotected)

B D

OM3500

OC-3/12/48

UPSR ring

OM3500

= OM3500 tributary circuit pack

= Path bridge & select

=Traffic A - B, VT#1, STS-1 #1 on a virtual ring (path-in-line), working

=Traffic C - D, VT#2, STS-1 #1 on a virtual ring (path-in-line), protected

Note: For simplicity, only one direction is shown.

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