Allied Telesis AT-9424T/POE, AT-9408LC/SP Redundant Twisted Pair Ports, Model Ports and Slots

Chapter 1: Overview

Redundant Twisted Pair Ports

Some AT-9400 Switches have two or four twisted pair ports that are paired with GBIC or 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.

Table 2 Twisted Pair Ports Matched with GBIC and
	SFP Slots
Model	Ports and Slots
AT-9424T/GB	23R with GBIC slot 23
	24R with GBIC slot 24
AT-9424T/SP	23R with SFP slot 23
	24R with SFP slot 24
AT-9424T,	21R with SFP slot 21
AT-9424Ts,	22R with SFP slot 22
and	23R with SFP slot 23
AT-9424Ts/XP	24R with SFP slot 24
AT-9448T/SP	45R with SFP slot 45
	46R with SFP slot 46
	47R with SFP slot 47
	48R with SFP slot 48

Follow these guidelines when using these ports and slots:

ˆOnly one port in a pair — either the twisted pair port or a corresponding GBIC or SFP module — can be active at a time.

ˆThe twisted pair port is the active port when its GBIC or SFP slot is empty, or when a GBIC or SFP module is installed but has not established a link to an end node.

ˆThe twisted pair port automatically changes to the redundant status mode when a GBIC or SFP module establishes a link with an end node.

ˆA twisted pair port automatically transitions back to the active status when the link is lost on the GBIC or SFP module.

ˆIn nearly all cases, a twisted pair port and a GBIC or SFP module share the same configuration settings, including port settings, VLAN assignments, access control lists, and spanning tree.

ˆAn 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 a GBIC or SFP module establishes a link with an end node.

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