EDM01-33v1 DAG_7.5G4_Card_User_Guide
©2008 Endace Technology Ltd. Confidential - Version 1 - November 2008
13
Power Input
Note:
The optical power input to the DAG card must be within the receiver’s dynamic
range. See the previous table for details. If it is slightly outside of this range it will
cause an increased bit error rate. If it is significantly outside of this range the system
will not be able to lock onto the signal.
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. In extreme cases, excess power can damage the receiver.
When you set up the DAG card you should measure the optical power at the receiver and
ensure that it is within the specified power range. If it is not, adjust the input power as
follows:
•
Insert an optical attenuator if power is too high, or
•
Change the splitter ratio if power is too high or too low.
Splitter Losses
Splitters have the insertion losses either marked on their packaging or described in their
accompanying documentation. General guidelines are:
•
A 50:50 splitter will have an insertion loss of between 3 dB and 4 dB on each output
•
90:10 splitter will have losses of about 10 dB in the high loss output, and <2 dB in the
low loss output
Note:
Endace recommends that you do not use a combination of single mode and multi
mode fibers and optics modules on the same link, as the quality of the received
signal cannot be guaranteed.
If you have no choice but to mix single mode and multi mode you should be aware
that a single mode input connected to a multi mode fiber will have some attenuation
but may still be acceptable. However a multi mode input connected to a single mode
fiber will likely have large and unpredictable losses.
Pluggable Copper Transceivers
The DAG 7.5G4 card supports industry standard Small Form-factor pluggable (SFP) copper
transceivers.
The transceivers consist of two parts:
•
Mechanical chassis attached to the circuit board
•
Transceiver unit which may be inserted into the chassis
Endace recommends that you use Cat6 copper cable. The DAG 4.5Z2/4.5Z8 card copper
module specification is shown below:
Part
Type
Data Rate
TXR-1000TX
10/100/1000 Base-T
>1.25Gbps
Summary of Contents for DAG 5.2X
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