3Com Corporation
EtherDisk Diskette for the EtherLink II Family
Physical Transmission Options
The EtherLink II TP adapter contains six options that control data
transmission on the physical medium. These options are set by moving
jumpers on the adapter. This applies only to the EtherLink II TP adapter.
For information on the EtherLink II/16 TP Adapter, please refer the
EtherLink II/16 TP Adapter Guide.
This file contains information that will help you set these options so that
the EtherLink II TP adapter will work correctly with both 10BASE-T and
non-10BASE-T hubs. For more information, refer to the EtherLink II TP
Adapter Guide.
Wire Impedance
--------------
Set the WIRE IMPEDANCE jumpers to match the characteristic impedance of your
cable.
Verify the characteristic impedance of your cable from the wiring closet to
the station by using a test device. Use the 100 ohms setting if you are
connecting to standard 10BASE-T wiring.
The available settings are:
Setting Impedance Range
------- ---------------
75 70-85 ohms
100 85-115 ohms
150 115-160 ohms
Other Options
-------------
The other jumpers should be set according to the following table:
HP StarLAN 10,
SynOptics AT&T STARLAN 10,
10BASE-T LattisNet DAVID Systems BULL Hub 10
Jumper (default) (non-10BASE-T) (non-10BASE-T) (non-10BASE-T)
-------- --------- -------------- -------------- --------------
LINK PULSE ON OFF OFF OFF
EQUALIZATION TX RX TX RX
DC SIGNAL OFF ON OFF OFF
TRANSMIT
LEVEL NORM LOW NORM LOW
RECEIVE
THRESHOLD NORM LOW NORM LOW
(%VER Physical Transmission Options v2.0c)
