Toshiba V Series User Manual page 222

Chapter 8 Error Handling
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(8) Network verification items (EN311)
EN311 external 1) Is the 10BASE5/10BASE2 switch
power supply set to the position corresponding to
the transmission medium actually
used?
2) Does the EXT.POWER LED turn on
?
Transmission 1) Is the AUI cable connected between
medium the EN311 and the MAU ?
installation
2) Are the MAU units installed with a
10BASE5
spacing of 2.5 meters of coaxial
cable between units ?
3) Does the MAU 12-VDC power
supply LED turn on ?
4) How long (in meters) are the AUI
cable ?
5) How long (in meters) are the coaxial
cable (i.e. segment lengths) ?
Transmission 1) Is the coaxial cable connected to
medium the EN311 ?
installation
10BASE2
2) Is the spacing between stations
(nodes) as mounted at least 0.5
meter ?
3) How long (in meters) are the coaxial
cable (i.e. segment lengths) ?
Verification items Resolution
1) Set the 10BASE5/10BASE2 switch
to the correct position.
2) Check whether or not the 12-VDC
power is supplied to the MAU power
supply terminals.
If the LED does not turn on even
when the 12-VDC power is
supplied, → replace the module.
1) Verify the AUI cable connections
between the EN311 and MAU units.
2) Connect the MAU units correctly at
the marked sections of the coaxial
cable.
Marked section spacing: 2.5 meters
3) Replace the AUI cables and the
MAUs with other units to verify their
operation.
Supplement:
We recommend keeping spares on
hand to minimize the time required
determining the location of the fault
using the above procedure and to
minimize the time required for
recovery.
4) The maximum AUI cable length is
50 meters.
5) The maximum segment length for
10BASE5 cabling is 500 meters.
1) Verify the AUI cable connections
between the EN311 and MAU units.
(These are the T-connector
connections.)
2) Set the cable length so that the
mounting spacing is at least 0.5
meter.
3) The maximum segment length for
10BASE2 cabling is 185 meters.
Ethernet module User's Manual