Black Box TS250A, Manual, Page: 57 / 64

Choosing crossover or straight-through cables
Chapter 5 FAQ and Troubleshooting
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rev. 1
nanosecond. A smaller MTU forces a server and client to redo
their handshake. Increase the MTU on your server to alleviate
this issue.
Choosing crossover or straight-through cables
When choosing whether to use a crossover or straight-through cable
with a TAP, consider the following:

The 10/100 Copper TAP requires straight-through cables.

Straight-through cables will always work when the TAP is
powered on because of the TAP’s auto-sensing capabilities.

Crossover cables may be a better choice for the Link ports in
the event that the TAP loses power and your switch must
renegotiate the link; however, depending on your device, it
may need straight-through cables to allow the switch to
renegotiate the link when the TAP does not have power.
Check with your device manufacturer.

Straight-through cables make an acceptable choice for a
connection to the analyzer because the analyzer connection is
secondary to the network connection. Your network will
remain active, however, you will not receive any data at your
analyzer until power is restored to the TAP.
I am seeing CRC errors on my network
If you are seeing an uncommonly high number of CRC errors, this
could indicate that there is an issue with the TAP, but it may also
indicate that the TAP is fine and there are other problems on your
network. Contact Black Box Support for assistance.