This page discusses Link Integrity and SQE settings on
Twisted Pair Ethernet networks.
The Twisted-pair Ethernet
connection runs with Link Integrity and SQE enabled, in compliance with
the IEEE 802.3 10BaseT standards. Some systems do not observe this
standard completely and need to have other settings. If you have a hubs
and routers on your network, you may find that you need to disable the
Link Integrity setting of the Twisted-pair interface. Link Integrity
pulses are sent at the end of each transmission to verify
communications between the hub and devices on the Twisted-pair network.
The ViewStation can disable Link Integrity either by software
or hardware settings. If you use the Twisted-pair interface with the
Ethernet type set to "Thin Wire" (on the Communications menu of Setup
Mode), the ViewStation uses Link Integrity; this is the Default
setting. If you set the Ethernet type to "ThickWire" with the
Twisted-pair interface in use, then Link Integrity is turned Off.
You can also control the Link Integrity pulse setting by
selections on Jumper 16 on the main circuit board. With jumpers 1-2
selected for JP16, Link Integrity is enabled; this is the factory
setting. With jumpers 2-3 selected for JP16, Link Integrity is disabled.
Another setting that is often thought to be related to Link
Integrity is the SQE signal. An SQE signal is sent on the collision
detection line to verify that collision detection is working. Some
systems want to disable these signals, because they increase the traffic
on the network. The ViewStation uses the SQE signals internally only,
as communication between the Ethernet controller and the Ethernet
transceiver chips on the main circuit board. Since the ViewStation does
not send the SQE signals on the network, requirements for the presence
or absence of SQE signals is not a concern for ViewStation users.
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