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Chapter 7. Planning for Media Modules
67
OC3 and STM-1 Line Characteristics
Table 44 summarizes the characteristics according to the type of line.
Table 44. OC3 and STM-1 Line Attachments
Characteristic
Singlemode Fiber
Multimode Fiber
Distance Range
Up to 10 or 20 km (8
m
fiber)
Up to 2 km (8
m
fiber)
Line Speed
155.520Mbps
Payload
149.760Mbps
Clock Extraction
Yes
Connector Type
SC
Number of Line
Attachments
1 line attachment per I/O card
Physical Interfaces
OC3/STM-1
Laser
1310 nm, class 1 (ITU G.597)(
1310 nm, LED
Minimum Transmitted
Power
-15 dB
-19 dB
Minimum Receiver
Sensitivity
-29 dB
-30 dB
Optical Power Budget
14 dB
11 dB
Frame Format
SONET STS-3c (T1-105)
SDH STM-1 (ITU-T G.708/G.709)
ATM cells in VC-4
Cell Delineation
I.432
Rate Decoupling
I.432, I.361, and ATM Forum 3.0/3.1
Idle Cell Character
Not supported
Cell Discard Policy
ANSI, ANSI unassigned
ATM Forum, ATM Forum unassigned
CCITT, CCITT unassigned
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