Manual

AT-S63 Management Software Web Browser Interface User’s Guide
Section I: Basic Operations 39
Redundant Twisted Pair Ports
Your AT-9400 Series switch may 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 1.
Follow these guidelines when using these ports and slots:
 Only one port in a pair — either the twisted pair port or a corresponding
GBIC or SFP module — can be active at a time.
 The 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.
 The twisted pair port automatically changes to the redundant status
mode when a GBIC or SFP module establishes a link with an end
node.
 A twisted pair port automatically transitions back to the active status
when the link is lost on the GBIC or SFP module.
 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.
 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 a GBIC or SFP
module establishes a link with an end node.
Table 1 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
23R with SFP slot 24
AT-9424Ts and
AT-9424Ts/XP
21R with SFP slot 21
22R with SFP slot 22
23R with SFP slot 23
23R 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