Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
DS3-12E Card
4.16 DS3-12E Card
The ONS 15454 DS3-12E 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 DS3-12E card provides
enhanced performance monitoring functions. The DS3-12E 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 4-18 shows the DS3-12E faceplate and a diagram of the card.
Figure 4-18 DS3-12E faceplate and block diagram
The following list summarizes DS3-12E 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
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B
a
c
k
p
l
a
n
e
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
SF
DS3
12E