Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
DS3-12 Card
4.14 DS3-12 Card
The ONS 15454 DS3-12 card provides 12 Telcordia-compliant, GR-499 DS-3 ports per card. Each port
operates at 44.736 Mbps over a single 75 ohm 728A or equivalent coaxial span. The DS3-12 card
operates as a working or protect card in 1:1 protection schemes and as a working card in 1:N protection
schemes. Figure 4-16 shows the DS3-12 faceplates, and a block diagram of the card.
Figure 4-16 DS3-12 faceplate and block diagram
You can install the DS3-12 card in any multispeed or high-speed card slot on the ONS 15454. Each
DS3-12 card port features DSX-level outputs supporting distances up to 450 feet depending on facility
conditions.
The DS3-12 card supports 1:1 protection with the proper backplane EIA. EIAs are available with BNC
or SMB connectors. For more information, see the “Electrical Card Protection and the Backplane”
section on page 4-14.
Caution When a protection switch moves traffic from the DS3-12 working/active card to the DS3-12
protect/standby card, ports on the now active/standby card cannot be taken out of service. Lost traffic
can result if you take a port out of service even if the DS3-12 standby card no longer carries traffic.
BTC
ASIC
DS3A
ASIC
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Protection
Relay
Matrix
B
a
c
k
p
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12
Line
Interface
Units
FAIL
ACT/STBY
SF
DS3
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