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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 3 Card Reference
DS3i-N-12 Card
Figure 3-14 DS3i-N-12 block diagram
3.10.3 DS3i-N-12 Card Specifications
• DS3i-N-12 Input
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Bit Rate: 44.736 MBits/s (Mbps) + 20 ppm
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Frame Format: ITU-T G.704, ITU-T G.752 / DS-3 ANSI T1.107-1988
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Line Code: B3ZS
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Termination: Unbalanced coaxial cable
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Input Impedance: 75 Ω + 5%
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Cable Loss: Max 137 m (450 ft) 734A, RG59, 728A / Max 24 m (79 ft) RG179
–
AIS: ITU-T G.704-compliant
• DS3i-N-12 Output
–
Bit Rate: 44.736 MBits/s (Mbps) + 20 ppm
–
Frame Format: ITU-T G.704 , ITU-T G.752 / DS-3 ANSI T1.107-1988
–
Line Code: B3ZS
–
Termination: Unbalanced coaxial cable
–
Output Impedance: 75 Ω + 5%
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AIS: ITU-T G.704-compliant
–
Power Level: -1.8 - +5.7 dBm (The power level is for a signal of all ones and is measured at a
center frequency of 22.368 MHz (3 +
1 -kHz) bandwidth.)
–
Pulse Shape: ITU-T G.703, Figure 14 / ANSI T1.102-1988 Figure 8
55292
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
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