Lucent Technologies OptiStar EdgeSwitch, Руководство пользователя

Страница: 46 / 330

2 - 6
Lucent Technologies
365-575-925R1.5
Issue 1, April 2002
2.2.2 MAN/WAN Considerations
Using the Gigabit Ethernet, OC-48c/STM-16c and OC-12c/STM-4c Network Modules, the OptiStar
EdgeSwitch can connect to a wide variety of MAN/WAN network elements, including SONET/SDH
multiplexers, WDM systems, IP routers and Gigabit Ethernet switches. Selection of the appropriate MAN/WAN
link(s) requires consideration of the bandwidth, performance, and other requirements for your particular FCIP
application.
2.2.2.1 SONET/SDH Interfaces
When connecting the OC-48c/STM-16c Network Module or the OC-12c/STM-4c Network Module to a
SONET/SDH interface, the interface must be
concatenated
SONET/SDH. Channelized SONET/SDH uses
different framing and will not work with the OptiStar EdgeSwitch Packet over SONET/SDH interfaces.
2.2.2.2 Optical Power Budgets and Link Loss
The optical power budget (PB) for the particular type of WAN interface also needs to be considered when
designing the application. In some cases it may be necessary to adjust the optical power level on the WDM or
SONET/SDH system that the OptiStar EdgeSwitch is connecting to, in order to ensure that the link is reliable.
The optical power budget may be viewed as the amount of optical power available to overcome the attenuation
within the optical link. Optical attenuation (sometimes called Link Loss, or LL) is caused by passive
components associated with the optical cable plant, including cables, cable splices and connectors.
The following table summarizes the optical power budget (PB) for OptiStar EdgeSwitch fiber interfaces:
Interface
Transmit Output
Power
Receiver
Sensitivity
Power Budget
(PB)
Maximum
Distance
Single Mode
Fiber GBIC
-8 to -3 dBm
at 1310 nm (nom)
-26.5 to -3
dBm
19 dB 10 km
Multimode Fiber
GBIC
-10 to -4 dBm
at 850 nm (nom)
-22.5 to 0
dBm
17 dB 500 m
OC-48c/STM-
16c Network
Module
-5 to -2 dBm
at 1310 nm (nom)
-24 to -18
dBm
19 dB 15 km
OC-12c/STM-4c
Network Module
-15 to –8 dBm
at 1310 nm (nom)
-28 to -8 dBm 13 dB 15 km
The following link loss factor attenuation guidelines should be used to estimate the power budget of the optical
link:
Link Loss Factor Attenuation
Single mode cable 0.5 dB/km
Connector 0.5 dB
Cable splice 0.5 dB