MRV Communications LambdaDriver 400, User Manual

Page: 98 / 207

LambdaDriver 400 & 800
ML46430, Rev. 07
October 2004
P = [ Transmitter Power – Receiver Sensitivity ] dB. It is the power budget
available between the LDx00 module and access unit.
For the fiber connecting the Access TX port of the local module to the RX
port of the local access unit:
Transmitter Power is the output power of the Access TX port of the
local module.
Receiver Sensitivity is that of the RX port of the local access unit.
For the fiber connecting the Access RX port of the local module to the TX
port of the local access unit:
Transmitter Power is the output power of the TX port of the local
access unit.
Receiver Sensitivity is that of the Access RX port of the local module.
The cable length is the smaller of the fiber lengths for the Access TX Port
and Access RX Port.
A is the fiber attenuation/length (usually 0.25dB/km).
17. WDM Cable Fiber Length
The maximum allowed length of fiber
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interconnecting two LDx00s is calculated as
follows:
M = (P - L) / A
where,
M is the maximum allowed length
P is the LDx00 power budget = [ Transmitter Power – Receiver Sensitivity ] dB.
Transmitter Power and Receiver Sensitivity apply to Transponders,
ESCONs, GM2s, and OAs. They are specified in Chapter 1 Overview, in the
respective product specification section for each module.
For the fiber connecting the WDM TX port of the
local module to the WDM
RX port of the remote module:
Transmitter Power is the output power of the WDM TX port of the local
module to which the access equipment is connected.
Receiver Sensitivity is that of the WDM RX port of the remote module
to which the access equipment is connected.
For the fiber connecting the WDM TX port of the remote module to the WDM
RX port of the local module:
Transmitter Power is the output power of the WDM TX port of the
remote module to which the access equipment is connected.
Receiver Sensitivity is that of the WDM RX port of the local module to
which the access equipment is connected.
The cable length is the smaller of the fiber lengths for the WDM TX Port and
WDM RX Port.
L is the total power loss. This includes losses due to interposing modules,
splices, etc., 2 dB transmission dispersion penalty for transponder-to-Mux/Demux
module connection, plus a safety margin of 3 dB. The loss for each module is
given in the product specification for the module. If a module has no loss, the
loss is not specified.
Power loss applies to the modules Mux, Demux, OADM, Mgt, 1+1, and Service.
It is specified in Chapter 1 Overview, in the respective product specification
section for each module.
A is the fiber attenuation/length (usually 0.25dB/km).
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There are fibers for interconnecting two LDx00s which may have lengths of as much as 90 km
(56 mi) before it becomes necessary to insert an OA.
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