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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter1 Hardware Installation
EIA Installation
Figure1-12 A BNC backplane for use in 1:1 protection schemes
The EIA side marked “A” has 24 pairs of BNC connectors. The first 12 pairs of BNC connectors
correspond to Ports 1 – 12 for a 12-port card and ma p to Slot 2 on the shelf assembly. The BNC connector
pairs are marked “Tx” and “Rx” to indicate transmit and receive cables for each po r t . You can install an
additional card in Slot 1 as a protect card for the ca rd i n Slot 2. T he se c ond 1 2 B NC c onnec tor pa irs
correspond to Ports 1 – 12 for a 12-port card and map to Slot 4 on the shel f 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 BNC connectors are used.
The EIA side marked “B” provides an additional 24 p airs of BNC c onnec tors. T he f irst 12 B NC
connector pairs correspond to Ports 1 – 12 for a 12-port card and map to Slot 14 on the shel f ass embl y.
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 – 12 for a 12-port car d and m ap to Slot 16 on t h e she lf
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 BNC 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.
1.6.2 High-Density BNC EIA
The ONS 15454 High-Density BNC EIA supports 48 DS-3 circuits on each side of the ONS 15454 (48
transmit and 48 receive connectors). If you install BNC EIAs on both sides of the unit, the ON S 154 54
hosts up to 96 circuits. The High-Density BNC EIA supports Trompeter U CB J224 (7 5 Oh m) 4 l eg
connectors (King or ITT are also compatible). You can use High-Density BNC EIAs for DS-3 (including
the DS3XM-6) or EC-1 cards. Figure 1-13 shows the ONS 15454 with pre-installed High-Density BNC
EIAs.

BA

BNC backplane
connectors
Tie wrap posts
2076
1717
2828
3939
410410
511511
612612
16
TX RX TX RX TX RX TX RX
TX RX TX RX TX RX TX RX
1717
2828
3939
410410
511511
612612
TX RX TX RX TX RX TX RX
TX RX TX RX TX RX TX RX
14 4 2