Allied-telesis AT-8550SP User Manual download pdf (Page 52)

Chapter 2: Installation

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)

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 89 90

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