Technical data

TraverseEdge 2020 Applications and Engineering Guide, Chapter 4: Equipment Protection
Page 4-2 Turin Networks Release 5.0.x
There can be 1 LEI (2 cables), 2 LEI (4 cables), 3 LEI (6 cables), or 4 LEI (8 cables) connected to a single
OTS2 shelf. With eight cables connected to a single OTS2 the shelf yields a full 192 STS-1 worth of band-
width. Removal of one of the cables will not impact the connectivity between the shelves due to internal
cross traffic “platforms” or “paths” designed into the LEI architecture.
Power
The CCTs require redundant -48Vdc nominal power inputs within a tolerance of -42.5Vdc to
-56.5Vdc, to be capable of normal operation in the event that one of the power inputs fails.
4.3 OTS2 CCT Protection
The OTS2 CCT (Common Control and Timing) cards provide the power and processing functionality for
the OTS2. There are two CCTs installed which can be “hot-swapped” while the system is operational, pro-
viding full redundancy of connections, timing, and administrative functions.
The TE-2020 Main Shelf CCTs and the OTS2 CCTs are similar in appearance but may not be swapped
between these shelves. The software contained on the OTS2 CCT is not capable of controlling the TE-
2020 Main Shelf CCT functionality. These CCTs each provide physical and electrical connectivity to the
TE-2020 Main Shelf for two optical PLMs. They reside in the OTS2 in an upper/lower configuration.
Refer to Figure 4-2.
Figure 4-2 OTS2 CCT Card Placement
Synchronization
Synchronization is recovered from the TE-2020 Main Shelf, sent to the tributary shelves via the LEIs, and
distributed within the OTS2 via the CCT.
LEI
The OTS2 CCTs provide redundancy for the LEI (Local Equipment Interconnect) ports that interface with
the TE-2020 Main Shelf. There are eight LEI connectors provided on the rear of the OTS2 which yield
four protected LEI pairs. These can be utilized to provide full redundancy of timing, traffic, and internal
management connectivity between the shelves. With eight cables (4 LEI) connected to a single OTS2 a full
192 STS-1 worth of bandwidth can be utilized from that shelf. Removal of one of the cables will not
impact the connectivity between the shelves due to internal cross traffic platforms designed into the LEI
architecture.
Power