Nortel Ethernet Switch 325-24G AL2012A46-E5 用户手册

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The Ethernet Switch 325 family is avail-
able in two standalone, compact 1 rack-
unit (1U) size models — the Ethernet
Switch 325-24T Switch (Figure 1) and
the Ethernet Switch 325-24G Switch
(Figure 2).

The Ethernet Switch 325-24T switch
features 24 10BASE-T/100BASE-TX
auto-sensing ports. The Ethernet Switch
325-24G switch supports 24 10BASE-
T/100BASE-TX auto-sensing ports plus
2 10/100/1000BASE-T ports for uplink
connectivity to servers or backbone
switches. Advanced features such as
Multi-Link Trunking (MLT), IGMP
Snooping, VLAN Trunking and flexible
management tools help you to efficiently
manage your network traffic (Figure 3).

Features and benefits

Wire-speed throughput

High-speed switching ASICs support
full line-rate forwarding and filtering
across all ports with the Ethernet Switch
325-24T providing a peak forwarding
rate of 3.6 million packets per second
and the Ethernet Switch 325-24G
supporting a forwarding rate of 6.6
million packets per second.

Auto MDI/MDI-X 

Ethernet Switch 325 models can be
connected to a hub or another switch
quickly and cost-effectively using either
a straight-through or crossover cable.
When a cable is connected to one of the

10/100 ports on the switch, the switch
port automatically can detect the signal
on the cable and configures itself. This
feature eliminates the need for an MDI/
MDI-X port; any port may be used for
connection to a hub or another switch.

Full autosensing on every port

Every UTP port on the Ethernet Switch
325 models is equipped with autosensing
technology to automatically detect and
support the speed and mode of a
connected device. The ports determine
whether a connected device is operating
at 10 Mbps or 100 Mbps, and automat-
ically adjust to the optimal speed. Each
of the switched ports can also automati-
cally detect and support full-duplex
connections to servers, power-user end
stations or other switches, as well as
half-duplex connections to legacy NICs
or hubs.

High-speed uplink ports

The Ethernet Switch 325-24G provides
two 10/100/1000BASE-T ports in the
front of the unit that provides high-
speed connections to backbone switches
or servers.

Custom Auto Negotiation

Advertisements (CANA)

This feature enables the network manager
to tune the capabilities that a particular
Ethernet port can advertise via auto-
negotiation. The capabilities include
half-duplex and full-duplex modes with
speeds of 10, 100 and 1000 Mbps.
Auto-negotiated Ethernet ports establish
a connection based upon the highest
common capabilities. This feature is
implemented by using CLI commands
and saves the network manager from
having to go to each workstation and
switch to configure a “fixed” speed.

Figure 1. Ethernet Switch 325-24T

Figure 2. Ethernet Switch 325-24G 

Figure 3. Small/medium enterprise solution