Turin Networks TE-50, User Manual, Page: 101 / 668

Turin Networks, Inc. Ch 1-6: SONET Ring UPSR Configuration Example
Page 3
2 NETWORK TOPOLOGY
The TE-50-SS can be connected as a linear Point-to-Point network or in a Ring topology.
In linear or terminal mode, the TE-50-SS can interface to a remote TE-50-SS or as a terminal of
another SDH/SONET network.
The TE-50-SS can be configured as a ring of many TE-50-SS.
The following describes alternative methods of connecting the fiber optic interfaces to provide
protected terminal (1+1) and ring (SNCP/UPSR) topologies.
2.1 SNCP/UPSR RING
When configured in a ring topology using the SNCP/UPSR APS, the TE-50-SS nodes are connected
using two contra-rotating, uni-directional fiber optic rings. Data is transmitted on both rings; the
receiving TE-50-SS makes a selection one of the two data paths based on signal quality, overhead
bytes, and management interface controls. The ring with transmission in a clockwise direction is
arbitrarily defined as the Working Ring; the other ring is the Protection Ring. There is no logical limit
to the number of nodes within the ring, although physical distance limits exist for each section based
on fiber optic plant and the choice of Turin fiber optic interface options.
2.1.1 EAST AND WEST
The SDH/SONET ring may have many member nodes, all of which may be accessed on the ring in
either a clockwise or counter clockwise direction. The directional terminology used to describe the
relative direction to the TE-50-SS is EAST or WEST.
•
The FO interface transmitter in slot 15 is always facing WEST.
•
The FO interface transmitter in slot 16 is always facing EAST.
2.1.2 SPAN AND RING
The TE-50-SS supports two physical fiber optic interface connection methods:
•
Span per Interface Module
•
Ring per Interface Module
As there are two methods of cabling the fiber optic interfaces into a ring, the direction the FO receiver
faces will change accordingly.
•
In Ring mode, (15 in, 15 out), each ring (working and protection) is contained within a single
interface module:
o
WEST = 15 receives from, 16 transmits to
o
EAST = 16 receives from, 15 transmits to