EDM01-02: DAG 4.2S Card User Guide
©2005
11
Version 7: May 2006
Procedure
Follow these steps to troubleshoot DAG 4.2S card configuration.
Step 1. Check Receiver Ports Optical Signal Levels.
The card supports 1300 nanometer single-mode fibre attachments with
optical signal strength between 0 dBm and -18 dBm.
If in doubt, check card receiver ports light levels are correct using an optical
power meter.
The card receiver ports are the lower half of the dual SC-style connector, the
closest to the LED’s.
Cover the unused card transmit port with an SC-style plug to prevent dust
and mechanical hazards from damaging optics.
Step 2. Understand Link Layer Configuration
Learn about the link layer configuration in use at the network link being
monitored.
Important parameters include specific scrambling options in use.
If the information cannot be obtained reliably, the card can be made to work
by varying the parameters until data is arriving at the host system.
Step 3. Check Card is Locked to Data Stream
Configure card according to local settings.
Check through the physical layer statistics that the card is locked to the data
stream.
Step 4. List Current Settings
For DAG 4.2S framer configuration and statistics the
dagfour
tool is
supplied.
Calling
dagfour
without arguments lists current settings.
The dagfour -h
prints a help listing on tool usage.
Step 5. Check FPGA Image Loaded.
Before configuring the card, ensure the most recent FPGA image is loaded
on the card.
