Endace DAG 3.8S, Руководство пользователя

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EDM01-09v7 DAG 3.8S Card User Guide
©2005 15 Version 9: May 2006
4.2 DAG 3.8S Card Configuration
Description The DAG 3.8S card uses two integrated SONET/SDH ATM/PoS physical
layer interface devices to support capturing of ATM cells and HDLC
encoded Packet-over-SONET data frames.
The card supports both OC3c, OC12c, STM-1 and STM-4c standards.
Because of its flexibility, the correct link layer configuration needs to be
supplied to the card for it to function as expected.
A successful DAG 3.8S card capture session is accomplished by receiver
ports optical signal levels and checking the card is locked to stream data.
This is followed by configuring the DAG card for normal use.
Procedure Follow these steps for a successful DAG 3.8S card capture session.
Step 1. Check Receiver Ports Optical Signal Levels
The card supports 1300 nanometer singlemode and multimode fibre
attachments with optical signal strength between 0 dBm and -22 dBm.
If there is doubt, check card receiver ports light levels are correct using an
optical power meter.
The card receiver ports are the lower of each dual-SC-style connectors, the
closest to the PCI-X slot.
Cover card transmit ports with SC-style plugs to prevent dust and
mechanical hazards damaging optics if not in use.
Step 2. Understand link layer configuration
Become knowledgeable of the link layer configuration in use at the network
link being monitored.
Important parameters include OC3c vs. OC12c configuration, ATM vs. PoS
as well as the 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 seen at the host system.