Nortel Networks Passport Module 8672A - Manual (Page 34)

34 Chapter 2 Passport 8672ATM Module technology overview
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SONET transmission rates
The following transmission rates are commonly used with SONET:
• OC-3c/STM-1: 155.52 Mb/s (and SDH/STM-1)
• OC-12c/STM-4: 622.08 Mb/s (and SDH/STM-4)
The SONET specification defines optical both as:
• Single-mode fiber (SMF)
• Multimode fiber (MMF)
Note: The estimated maximum transmission distance for OC-3c SMF is
20 kilometers (km); for OC-3c MMF is 2 km; for OC-12c SMF is 15 km;
for OC-12c MMF is 500 m.