Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
DS3N-12E Card
4.17 DS3N-12E Card
The ONS 15454 DS3N-12E card provides 12 Telcordia-compliant ports per card. Each port operates at
44.736 Mbps over a single 75 ohm 728A or equivalent coaxial span. The DS3N-12E card provides
enhanced performance monitoring functions. The DS3N-12E can detect several different errored logic
bits within a DS-3 frame. This function allows the ONS 15454 to identify a degrading DS-3 facility
caused by upstream electronics (DS-3 Framer). In addition, DS3 frame format auto detection and J1 path
trace are supported. By monitoring additional overhead in the DS-3 frame, subtle network degradations
can be detected. Figure 4-19 shows the DS3N-12E faceplate and a diagram of the card.
Figure 4-19 DS3N-12E faceplate and block diagram
The following list summarizes the DS3N-12E card features:
• Provisionable framing format M23, C-bit or unframed
• Autorecognition and provisioning of incoming framing
• P-bit monitoring
• C-bit parity monitoring
• X-bit monitoring
• M-bit monitoring
61350
B
a
c
k
p
l
a
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DS3
ASIC
Flash
uP bus
SDRAM
BTC
ASIC
Line
Interface
Unit #1
main DS3-m1
protect DS3-p1
Line
Interface
Unit #1
main DS3-m12
protect DS3-p12
Processor
OHP
FPGA
BERT
FPGA
FAIL
ACT/STBY
SF
DS3 N
12E