Technical data

TraverseEdge 2020 Applications and Engineering Guide, Chapter 3: System Applications
Release 5.0.x Turin Networks Page 3-19
Figure 3-17 TE-2020 as a Regenerator
3.4 UPSR (Unidirectional Path-Switched Rings)
The unidirectional path-switched ring (UPSR) provides protection from fiber cuts for each VT1.5 or STS
on an individual basis. The UPSR requires the use of only one TE-2020 Main Shelf, and optional tributary
shelves (up to four) at each site.
Figure 3-18 shows the basic function of a UPSR network. With this architecture, each node is equipped
with only two optical transmitter and receiver units (optical tributaries excluded), one respectively for each
direction. Protection is provided for the entire path of each STS tributary rather than for the OC-192 (or
OC-48, OC-12, OC-3) line between nodes. The signal path is the end-to-end connection between the node
that originates the signal and the node that terminates the signal. The UPSR architectures provide two sep-
arate routes for each STS or VT1.5, which provides protection in the event of a fiber cut.
The TE-2020 supports UPSR for the OC-192, OC-48, OC-12, or OC-3 line rates from the main shelf or
from OC-48, OC-12, or OC-3 on an OTS2. The TE-2020 could be configured with as many as one OC-192
UPSR ring and eightOC-48 UPSR rings or 12 OC-48 UPSRs (no OC-192s). This allows for the aggrega-
tion of traffic from many different UPSR rings.
Table 3-8 Regenerator Application Equipment Requirements
QTY Part
1 TE-2020 Main Shelf
2 TE-2020 Main CCT
1 TE-2020 Main Fan Tray
2 OC-192 x1 PLM
4 Optical PLM Blanks