User Manual

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Troubleshooting
This section is intended to help you solve the most common problems that may occur on the
CWGE24MODMS Managed Switch.
 Incorrect connections
The switch port can automatically detect straight or crossover cable when linked with
another Ethernet device. For the RJ45 connection, use correct UTP or STP cables. The
10/100/1000Mbps port uses 2-pairs twisted cable and the Gigabit 1000T port uses 4 pairs
twisted cable. If the RJ45 connector is not correctly pinned then the link will fail. For the fiber
connection, please note that 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 category 5-cable tester
is a recommended tool for every 100Base-T network installation.
RJ45 ports: Use unshielded twisted-pair (UTP) or shield twisted-pair (STP) cable for RJ45
connections: 100Ω Category 3, 4 or 5 cable for 10Mbps connections, 100Ω Category 5
cable for 100Mbps connections or Category-5e / Category-6 for above 1000Mbps
connections. The length of any twisted-pair connection should not exceed 100 meters (328
feet). The Gigabit port uses Cat-5 or cat-5e cable for 1000Mbps connections. The length
should not exceed 100 meters.