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C-6
Hardware Specifications
C.2.2 155 Mbps OC-3c/STM-1 MM Module
The following specifications apply to network modules NM-4/155MMSCC
and NM-4/155MMSTC:
Description Specification
Port Capacity Four SONET/SDH ports per module
Data Rate 155.52 Mbps
Output Buffer 13,312 cell capacity
Media Multimode fiber
Max. Line Length ~2 km
Connectors ST or dual SC
Line Encoding Non-Return to Zero (NRZ)
Framing STS-3c/STM-1
Clock Accuracy ±20 ppm
Timing Internal timing or per port network timing
Loopbacks Transmit and receive loopbacks
Power -14 to -20 dBm transmit, -14 to -30 dBm receive,
0 to 10 dB path attenuation
Core Diameter 62.5 µm
Fiber Diameter 125 µm
Wavelength 1310 nm
Statistics/Alarms SONET/SDH statistics include Loss of Signal
(LOS), Loss of Frame (LOF), Loss of Pointer
(LOP), Far End Block Errors (FEBE), Alarm
Indication Signal (AIS), Far End Receive Fail-
ure (FERF), Yellow Alarm, Bit Interleaved Par-
ity errors (Line BIP-24, Section BIP-8, Path
BIP-8), Header Check Sequence (HCS) errors
Compliance ATM Forum STS-3c UNI v3.1, ITU-T I.432,
ANSI T1E1.2/93-020, T1S1/92-185, ITU-T
G.957, Bellcore TR-NWT-000253