Allied Telesis SwitchBlade 4000 Series Switch Hardware Reference - Manual (Page 28)

28 SwitchBlade 4000 Series Switch
C613-03060-00 REV H
AT-SB4442 V2 24-Port Gigabit (SFP) Ethernet Line Card
Weight
• 2.4 kg
Ports
• Twenty four full duplex SFP ports. SFP ports can be 1000BASE-T
copper, or 1000BASE (SX, LX, ZX) fibre, depending on the SFP used.
• Auto MDI/MDI-X as default (MDI-X if auto-negotiation is disabled).
Where this card is used to replace an 8 port card, 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
One per port that indicates the following conditions:
• Steady amber glow:
With a fibre SFP inserted - this indicates that the SFP is fitted into the
port connection.
• Flashing amber glow indicates that the SFP is not functioning correctly.
• Steady green glow:
With a copper SFP inserted - this indicates that negotiation has
completed between both ends of the link and communication at 1 Gbps
has been established.
With a fibre SFP inserted - this indicates that the SFP is able to send and
receive a light signal from the connection at the far end of the link.
• Flashing green indicates that there is data activity over the connection.
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.
• 64 MByte RAMBUS packet buffer, enabling traffic bursting to be
absorbed.
• Either 33 MHz or 40 MHz, depending on the speed of the master card’s
PCI bus.
AT-SB4442 V2
INSTALLED LINK
FAULT ACT
SFP
CLASS 1 LASER PRODUCT DO NOT STARE INTO BEAM
AT-SB4442 V2
Line Card