t71l6808a TM Technology Inc., t71l6808a Datasheet - Page 8

• Manufacturer Part Number: t71l6808a
• Description: Octal 10/100 Switch With Embedded Memory
• Manufacturer: TM Technology Inc.

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Preliminary T71L6808A
packets (include broadcast DA and DA search missed packet) will be forwarded to those ports
belong to the same VLAN group. When VLAN is programmed to 1, port 0-3 and port 4-7 are
belong to two different VLAN groups. Two VLAN groups are not overlapped, thus one
T71L6808A can support two 4 ports switch function whenever VLAN is programmed high.
Port Trunking
Trunking allows two ports to be connected in parallel between two switches to increase the
interconnection bandwidth. The trunking algorithm determines on which of these ports a frame is
transmitted so that the load is spread across these ports. However, while traffic should be shared
between trunking ports as evenly as possible. The T71L6808A supports port 0 and port 1 to be one
trunk group. Hense, the maximum aggregated bandwidth for trunking group is 400Mbps. (or
200Mbps, bi-directional)
Port Monitoring
The T71L6808A supports port monitoring. This feature provides complete network monitoring
capability at 100 Mbit/s. A copy ingress (RX) data of the monitored port is sent to their respective
snooping ports. The monitored port is selected by MPID. The T71L6808A allows receive data to be
monitored by different snooping ports. The snooping ports are also selected by SPID.
Priority
In Multimedia application, the audio & voice message is time critical to users. Normally it might
have discontinue phenomenon through the Ethernet network, especially if the network segment
utilization more than 30%, the message can not reach users in time.
The T71L6808A supports port priority per port basis QoS. Continuous priority traffic to
a destination port will take precedence against normal continuous traffic to the same destination
port. Packets from priority ports will arrive at the destination port earlier than packets arrived from
normal ports. Priority rules apply for ports in any speed mode and duplex mode.
T71L6808A has 2 queues for each port: One for regular traffic, another for priority traffic. The
packets coming from the port(s) with priority setup (QoS) will go to the priority queue of the
destination port.
Serial Management Interface MDC/MDIO
The T71L6808A supports PHY management through the serial MDIO and MDC signal lines. After
power on reset, the T71L6808A write abilities to the advertisement register 4 of connected PHY and
Taiwan Memory Technology, Inc. reserves the right
P. 8
Publication Date:May. 2001
to change products or specifications without notice.
Revision:0.A