Allied Telesis SwitchBlade 4000 Series Switch Hardware Reference - Manual (Page 26)

26 SwitchBlade 4000 Series Switch
C613-03060-00 REV H
AT-SB4412 and AT-SB4412 V2 24-Port Gigabit (RJ-45)
Ethernet Line Card
Weight
• 2.4 kg
Ports
• Twenty four auto-negotiating, or manually configurable, ports:
10BASE-T/100BASE-TX/1000BASE-T - all able to operate in either full
duplex or half duplex mode
• Auto MDI/MDI-X as default (MDI-X if auto-negotiation is disabled)
• RJ-45 connectors
Where this card is used to replace the 8 port AT-SB4411, a general rule is to
first use the centre 8 ports shown within the dotted line. This is to equally
distribute the traffic across the card’s two ASIC switch instances and their
connections to the intercard backplane. However, where heavy traffic is
anticipated between ports that are both connected to this card, we
recommend that these ports be grouped within the same switch instance.
This will maximise throughput by locally switching the heavy traffic, and
minimise traffic flow across the backplane. Ports 1 to 12 share one switch
instance (and its backplane connections), whilst ports 13 to 24 share the
other.
LEDs
Each port contains two LEDs, a D/C (duplex/collisions) LED, and a L/A
(link speed/activity) LED. Their operation is shown below:
L/A
• Steady Green display indicates that negotiation has completed between
both ends of the link and communication at 1 Gbps has been
established.
• Steady Amber display indicates that negotiation has completed between
both ends of the link and communication at 10 Mbps or 100 Mbps has
been established.
• Flashing Green display indicates that the link is actively transmitting data
at 1 Gbps.
• Flashing Amber display indicates that the link is actively transmitting
data at 10 Mbps or 100 Mbps.
D/C
• Steady Green display indicates the link is operating in full duplex mode.
• Steady Amber display indicates the link is operating in half duplex mode.
• Flashing Amber display indicates that the link is detecting collisions -
applies only to the half duplex mode.
Switching
• Two ASIC switch chips operating in Layer 3 mode and at wire speed.
• 40 k-entry, CAM based, L2/L3 forwarding address database.
• VLAN support, based on: protocol, port, IP subnet, and MAC address.
L /A D/C
L /A
D/C
L /A
D/C
L /A
D/C
AT-SB4412 V2
AT-SB4412 V2
Line Card