Gigabit Interface Converters (Gbics) - Allied Telesis AT-9812T V2 Hardware Reference Manual

10

Gigabit Interface Converters (GBICs)

GBICs are removable gigabit port converters for switches that have GBIC bays.
GBICs allow users to interchange port types to meet changing network
requirements. GBICs can be purchased when a switch is purchased, or can be
purchased separately as needed.
The following GBICs have been tested and approved for use with AT-9800
Series switches:
Allied Telesis AT-G8T, 1000BASE-T, 100m
Allied Telesis AT-G8SX, 550m SX
Allied Telesis AT-G8LX10, 10km LX
Allied Telesis AT-G8LX25, 25km LX
Allied Telesis AT-G8LX40, 40km LX
Allied Telesis AT-G8LX70, 70km LX
For the latest list of approved GBICs, contact your authorised Allied Telesis
distributor or reseller, or visit www.alliedtelesis.com/support/software.
For information on installing GBICs, see the AT-9800 Series Switch Quick
Install Guide.
Any combination of copper and fibre GBICs can be installed in the AT-9812T
and AT-9816GB switches.
Important RX and TX terminal locations on SC fibre GBIC ports are the reverse
of RX and TX terminal locations on fixed SC fibre ports. When looking at an SC
fibre GBIC from the front, the RX terminal is on the left and the TX terminal is
on the right.
GBIC 1000BASE-T Auto-Negotiation
1000BASE-T GBICs support only 1000 Mbps full duplex connections. Although
1000BASE-T GBICs will participate in auto-negotiation processes, they will
only advertise 1000 Mbps. Half duplex, 10BASE-T, and 100BASE-TX modes are
not supported.
While 1000BASE-T GBICs will auto-negotiate at the copper Ethernet level, the
ports will behave as if in fixed 1000 Mbps full duplex mode. This is because the
SERDES connection used by GBIC ports makes the auto-negotiation invisible
to the switch, and so prevents a successful link negotiation.
When a 1000BASE-T GBIC is inserted into a GBIC slot, the port's auto-
negotiation capability is disabled. This means that the port speed may not be
set to "auto-negotiate". If the port has been configured to auto-negotiate (by
default or by command) prior to the GBIC's insertion, then this configuration is
overridden for as long as the GBIC remains in place.
AT-9800 Series Switch
C613-03059-00 REV F