LevelOne GTL-2691, Руководство по установке

Страница: 50 / 78

4-6
Making Network Connections
4
Connectivity Rules
When adding hubs (repeaters) to your network, please follow the connectivity rules
listed in the manuals for these products. However, note that because switches break
up the path for connected devices into separate collision domains, you should not
include the switch or connected cabling in your calculations for cascade length
involving other devices.
10GBASE-T Cable Requirements
The primary cable specified for 10GBASE-T is augmented Category 6
(Category 6a). Other types also work, but the specific installation may have to be
qualified for 10G operation. See the IEEE 802.3an-2006 standard and the relevant
TIA specifications listed therein.
1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections should also
work for 1000BASE-T, providing that all four wire pairs are connected. However, it is
recommended that for all critical connections, or any new cable installations,
Category 5e (enhanced Category 5) or Category 6 cable should be used. The
Category 5e specification includes test parameters that are only recommendations
for Category 5. Therefore, the first step in preparing existing Category 5 cabling for
running 1000BASE-T is a simple test of the cable installation to be sure that it
complies with the IEEE 802.3-2005 standards.