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Chapter 2: Installation
52
Planning the Installation
Table 10 contains the cabling specifications for the twisted pair ports.
Note
The twisted pair ports on the switch feature auto-MDI/MDI-X. They
configured themselves automatically as MDI or MDI-X when
connected to an end node. This allows you to use a straight-through
twisted pair cable when connecting any type of network device to a
port on the switch.
The auto-MDI/MDI-X feature is disabled if you disable Auto-
Negotiation on a port and set a port’s speed and duplex mode
manually using the AT-S62 management software. A port where
Auto-Negotiation has been disabled defaults to MDI-X. Disabling
Auto-Negotiation may require that you manually configure a port’s
MDI/MDI-X setting or use a crossover cable.
Note
The 10/100/1000Base-T ports, Ports 49R and 50R, on the
AT-8550GB and AT-8550SP switches can operate at 1000 Mbps
only when set to Auto-Negotiation, which is the default setting. You
cannot manually set these ports to 1000 Mbps.
Table 10. Twisted Pair Cabling and Distances
Model Speed Cable Type
Maximum
Operating
Distance
AT-8524M
AT-8524POE
AT-8550GB
AT-8550SP
10 Mbps Category 3 or better
100-ohm shielded or
unshielded twisted pair
cable
100 m (328 ft)
100 Mbps Category 5 or Category
5E (Enhanced)
100-ohm shielded or
unshielded twisted pair
cable
100 m (328 ft)
AT-8550GB
AT-8550SP
(Ports 49R
and 50R)
1000 Mbps Category 5 and
Category 5E
(Enhanced) 100-ohm
shielded or unshielded
twisted pair cable
100 m (328 ft)