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Chapter 1
Shelf and Backplane Hardware
Figure 1-15
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.
1.5.5 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:
•
•
•
•
•
•
78-18106-01
High-Density BNC Backplane for Use in 1:N Protection Schemes
B
17
16
14
TX
RX
TX
RX
TX
RX
TX
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
8
8
8
9
9
9
10
10
10
11
11
11
12
12
12
TX
RX
TX
RX
TX
RX
TX
DS3-12, DS3N-12
DS3i-N-12
DS3-12E, DS3N-12E
EC1-12
DS3XM-6
DS3XM-12
13
5
4
2
RX
TX
RX
TX
RX
TX
RX
TX
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
5
5
5
5
6
6
6
6
7
7
7
7
8
8
8
8
9
9
9
9
10
10
10
10
11
11
11
11
12
12
12
12
RX
TX
RX
TX
RX
TX
RX
TX
A
1
RX
1
2
BNC backplane
3
connectors
4
5
6
7
8
9
10
11
12
RX
Cisco ONS 15454 Reference Manual, R8.5
1.5.5 MiniBNC EIA
1-21
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