Phase #21 Multicast Transmit/Receive Test - AT&T 3B2 Off-Line Diagnostic Manual

Phase Descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Phase #21
Phase Name:
Type:
Function:
Tests:
Time:
Warnings:
Notes:
Multicast Transmit/Receive Test
Network Access Unit Multicast Transmit/Receive (sl_mc)
Demand
This phase tests the ability of the INTEL 82586 LAN Coprocessor to transmit
and receive a multicast packet.
Test 1 - checks the INTEL 82586 LAN Coprocessor preinitialization.
Test 2 - checks the INTEL 82586 LAN Coprocessor initialization.
Tests 3 through 8 - check the INTEL 82586 LAN Coprocessor configuration
command.
Tests 9 through 11 - check the INTEL 82586 LAN Coprocessor receive
activities.
Tests 12 through 21 - check the INTEL 82586 LAN Coprocessor packet
transmission and status.
Test 22 - checks the INTEL 82586 LAN Coprocessor interface to the
Address/Data Bus.
Tests 23 through 26 - no tests run.
Test 500 - checks the INTEL 82586 LAN Coprocessor interface to the
Control/Status bus.
15 seconds
It is possible for this phase to fail due to severe media congestion. This can
occur when a "bus hog" is monopolizing the medium, or when traffic on the
medium is so heavy that the repeated attempts by the Network Access Unit to
access the medium fail. In cases where the Network Access Unit passes all
except its external loop around phases, follow the procedure described in the
notes below.
This phase externally loops a 12-byte multicast packet to the INTEL 82586
LAN Coprocessor.
Immediately following installation, and whenever media problems are
suspected, externalloopback tests should be run twice: once with the Network
Access Unit disconnected from the STARLAN Network (Network Access Unit
jacks empty) and once with the Network Access Unit connected to the
STARLAN Network.
In the case where the Network Access Unit is connected to a STARLAN
Network, the packet is routed through a Network Access Unit STARLAN
Network media interface jack and onto the STAR LAN Network. Successful
completion of this phase with the Network Access Unit configured as described
tests the STARLAN Network interface circuitry, media interface connectivity
via the jack, and the STARLAN Network itself.
15-54 OFF-LINE DIAGNOSTIC MANUAL