Troubleshooting; Solving Common Extender Problems; Collision Indicator Is Lit Continuously - Black Box 10BASE-T Manual

10BASE-T EXTENDER

4.2 Troubleshooting

4.2.1 S C
OLVING OMMON
Make sure the Extender link is 600 feet (272 m) or less in length and that the cable
is of unshielded twisted-pair construction. Do not use flat telephone cables for
patch cables or any other Extender network connection for two reasons:
1. Some devices are quite sensitive to EMI and RFI noise. If you use flat
untwisted wire—even short patch cables—you may experience very poor
performance.
2. Flat telephone cables typically have their polarity reversed; any device on
a leg with the wrong polarity will not communicate with the repeater.
4.2.2 C I
OLLISION NDICATOR IS
Check that the Extender port:
• is connected
• does not have an open circuit
• does not have a crossed cable (instead of a straight-through cable) connected
to it
Be sure that one pair in the cable has pins 3 and 6 in the same pair
(see Figure 3-5 on page 13). Do not split pairs.
DO NOT SPLIT PAIRS
If using premade 4 pair
patch cords be sure they
are wired so that pins
3 and 6 are in the
same pair.
22
E P
XTENDER ROBLEMS
L C
IT ONTINUOUSLY
1
2
3
4
5
6
7
8
Figure 3-13. Incorrect cabling.
1
2
3
Pins 3
4
and 6 are
in different
5
pairs
NO GOOD
6
7
8