Endace Measurement Systems.
http://www.endace.com
EDM01.05-10r1 DAG 4.3S Card User Manual
9
Revision 6. 22 September 2005.
3.0 SETTING DAG 4.3S CARD OPTICAL POWER
Description
The optical power range depends on the particular device fitted on the
DAG 4.3S card.
The DAG 4.3S card is shipped fitted with FTRJ 1321S 1300nm single-
mode short range optics module by default.
Optical power
measure
Optical power is measured in dBm – decibels relative to 1 mW where 10
dB is equivalent to a factor of 10 in power.
The numbers are all negative, showing powers below 1 mW. The most
sensitive devices can work down to about –30 dBm, or 1 uW.
Configuration
The following table describes the DAG 4.3S card optics power module
part, single-mode fibre [SMF], and configuration.
Part No.
Fibre
Data
Rate
Min/Max
Pwr [dBm] in
Min/Max
Pwr [dBm] out
Min/Max
Wavelength in
Min/Max
Wavelength out
Finisar
FTRJ1321S
SMF 2488
-18/0
-9.5/-3
1270/1600
1260/1360
Agilent
HFCT5942
SMF 2488
-19/-3
-10/-3
1260/1570
1260/1360
In this chapter
This chapter covers the following sections of information.
•
DAG 4.3S Card Optical Power Input
•
Splitter Losses
3.1 DAG 4.3S Card Optical Power Input
Description
The optical power input to the DAG 4.3S card must be within a receiver’s
dynamic range.
When optical power is slightly out of range an increased bit error rate is
experienced. If power is well out of range the system cannot lock onto the
SONET signal. In extreme cases of being out range excess power will
damage a receiver.
When power is above the upper limit the optical receiver saturates and
fails to function. When power is below the lower limit the bit error rate
increases until the device is unable to obtain lock and fails.
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