Figure 1-13: Bnc Backplane For Use In 1:1 Protection Schemes - Cisco ONS 15454 Series Reference Manual

ONS_15454_Reference_Manual_R8.5.x_--_Shelf_and_Backplane_Hardware
designed for long runs. You can use BNC EIAs for DS-3 (including the DS3XM-6 and DS3XM-12) or EC-1
cards.
Figure 1-13 shows the ONS 15454 with preinstalled BNC EIAs.
To install coaxial cable with BNC connectors, refer to the "Install Shelf and Backplane Cable" chapter in the
Cisco ONS 15454 Procedure Guide.

Figure 1-13: BNC Backplane for Use in 1:1 Protection Schemes

BNC Connectors
The EIA side marked "A" has 24 pairs of BNC connectors. The first 12 pairs of BNC connectors correspond
to Ports 1 to 12 for a 12-port card and map to Slot 2 on the shelf assembly. The BNC connector pairs are
marked "Tx" and "Rx" to indicate transmit and receive cables for each port. You can install an additional
card in Slot 1 as a protect card for the card in Slot 2. The second 12 BNC connector pairs correspond to Ports
1 to 12 for a 12-port card and map to Slot 4 on the shelf assembly. You can install an additional card in Slot 3
as a protect card for the card in Slot 4. Slots 5 and 6 do not support DS-3 cards when the standard BNC EIA
panel connectors are used.
The EIA side marked "B" provides an additional 24 pairs of BNC connectors. The first 12 BNC connector
pairs correspond to Ports 1 to 12 for a 12-port card and map to Slot 14 on the shelf assembly. The BNC
connector pairs are marked "Tx" and "Rx" to indicate transmit and receive cables for each port. You can
install an additional card in Slot 15 as a protect card for the card in Slot 14. The second 12 BNC connector
pairs correspond to Ports 1 to 12 for a 12-port card and map to Slot 16 on the shelf assembly. You can install
an additional card in Slot 17 as a protect card for the card in Slot 16. Slots 12 and 13 do not support DS-3
cards when the standard BNC EIA panel connectors are used.
When BNC connectors are used with a DS3N-12 card in Slot 3 or 15, the 1:N card protection extends only to
the two slots adjacent to the 1:N card due to BNC wiring constraints.
BNC EIA 18