Cisco ONS 15454 Series Reference Manual page 20

ONS_15454_Reference_Manual_R8.5.x_--_Shelf_and_Backplane_Hardware
The EIA side marked "A" hosts 48 pairs of BNC connectors. Each column of connector pairs is numbered
and corresponds to the slot of the same number. The first column (12 pairs) of BNC connectors corresponds
to Slot 1 on the shelf assembly, the second column to Slot 2, the third column to Slot 4, and the fourth
column to Slot 5. The rows of connectors correspond to Ports 1 to 12 of a 12-port card.
The EIA side marked "B" provides an additional 48 pairs of BNC connectors. The first column (12 pairs) of
BNC connectors corresponds to Slot 13 on the shelf assembly, the second column to Slot 14, the third
column to Slot 16, and the fourth column to Slot 17. The rows of connectors correspond to Ports 1 to 12 of a
12-port card. The BNC connector pairs are marked "Tx" and "Rx" to indicate transmit and receive cables for
each port. The High-Density BNC EIA supports both 1:1 and 1:N protection across all slots except Slots 6
and 12.
MiniBNC EIA
The ONS 15454 MiniBNC EIA supports a maximum of 192 transmit and receive DS-3 connections, 96 per
side (A and B) through 192 miniBNC connectors on each side. If you install BNC EIAs on both sides of the
unit, the ONS 15454 hosts up to 192 circuits. The MiniBNC EIAs are designed to support DS-3 and EC-1
signals.
The MiniBNC EIA supports the following cards:
• DS3-12, DS3N-12
• DS3i-N-12
• DS3-12E, DS3N-12E
• EC1-12
• DS3XM-6
• DS3XM-12
• DS3/EC1-48
MiniBNCs support available high-density cards in unprotected and 1:N protection (where N 2) protection
groups.
Figure 1-15: High-Density BNC Backplane for Use in 1:N Protection Schemes 20