Allied Telesis AT-9424Ts AC, Руководство по установке

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Chapter 1: Overview
26
Redundant Twisted Pair Ports
Four of the twisted pair ports on the AT-9424Ts and AT-9424Ts/XP
Switches are paired with SFP slots. The twisted pair ports are identified
with the letter “R” for “Redundant” as part of their number on the front
faceplate of the unit. The ports and slots are listed in Table 2.
Follow these guidelines when using these ports and slots:
ˆ
Only one port in a pair can be active at a time. It can be either the
twisted pair port or the corresponding SFP module.
ˆ
The twisted pair port is the active port when its SFP slot is empty, or
when an SFP module is installed but has not established a link to an
end node.
ˆ
The twisted pair port automatically changes to the redundant status
mode when an SFP module establishes a link with an end node.
ˆ
A twisted pair port automatically transitions back to the active status
when the link is lost on the SFP module.
ˆ
In nearly all cases, a twisted pair port and an SFP module share the
same configuration settings, including port settings, VLAN
assignments, access control lists, and spanning tree.
ˆ
An exception to the shared settings is port speed. If you disable Auto-
Negotiation on a twisted pair port and set the speed and duplex mode
manually, the speed reverts to Auto-Negotiation when an SFP module
establishes a link with an end node.
Note
These guidelines do not apply to the XFP slots on the AT-9424Ts/XP
and AT-9448Ts/XP switches.
Table 2 Twisted Pair Ports Matched with SFP Slots
Model Ports and Slots
AT-9424Ts and
AT-9424Ts/XP 21R with SFP slot 21
22R with SFP slot 22
23R with SFP slot 23
24R with SFP slot 24