Lantech LGS-2424C User manual - Troubleshooting
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Troubleshooting
This section is intended to help user solve the most common problems on the 24
10/100/1000T with 4 1000SFP shared cage SNMP Managed Switch.
Incorrect connections
The switch port can automatically detect straight or crossover cable when user link
switch with other Ethernet device. As for the RJ-45 connector, it should use correct UTP
or STP cable; 10/100TX port use 2-pairs twisted cable, while Gigabit 1000T port use 4
pairs twisted cable. If the RJ-45 connector is not correctly pinned on right position, then
the link will fail. As for fiber connector, please notice the fiber cable mode and fiber
module should match.
Faulty or loose cables
Look for loose or obviously faulty connections. If they appear to be OK, make sure the
connections are snug. If that does not correct the problem, try a different cable.
Non-standard cables
Non-standard and miss-wired cables may cause numerous network collisions and other
network problem, and can seriously impair network performance. A cable tester is a
recommended tool for network installation.
RJ-45 ports:
Use unshielded twisted-pair (UTP) or shield twisted-pair (STP) cable for
RJ-45 connections: 100
Ω Category 3, 4 or 5 cable for 10Mbps connections, 100Ω
Category 5 cable for 100Mbps connections, or 100
Ω Category 5e/above cable for
1000Mbps connections. Also be sure that the length of any twisted-pair connection does
not exceed 100 meters (328 feet).
Improper Network Topologies