Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
DS3N-12 Card
4.15 DS3N-12 Card
The ONS 15454 DS3N-12 card provides 12 Telcordia-compliant, TR499 DS-3 ports per card. Each port
operates at 44.736 Mbps over a single 75 ohm 728A or equivalent coaxial span. Figure 4-17 shows the
DS3N-12 faceplate and a diagram of the card.
Figure 4-17 DS3N-12 faceplate and block diagram
You can install the DS3N-12 card in any multispeed or high-speed card slot. Each DS3N-12 card port
features DSX-level outputs supporting distances up to 450 feet depending on facility conditions. With
the proper backplane EIA, the card supports BNC or SMB connectors.
The DS3N-12 can operate as the protect card in a 1:N (N<
5) DS-3 protection group. It has additional
circuitry not present on the basic DS3-12 card that allows it to protect up to five working DS3-12 cards.
The basic DS3-12 card can only function as the protect card for one other DS3-12 card. Other than the
protection capabilities, the DS3-12 and DS3N-12 cards are identical.
BTC
ASIC
DS3A
ASIC
61348
Protection
Relay
Matrix
B
a
c
k
p
l
a
n
e
12
Line
Interface
Units
FAIL
ACT/STBY
SF
DS3N
12
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