Nortel BayStack 420-24T Specifications
Product Brief
BayStack 420-24T Switch
Each BayStack 420-24T Switch has
24 10BASE-T/100BASE-TX autosensing
ports, 1 GBIC-based (Gigabit Interface
Converter) uplink slot and built-in
stacking connectors. It can be used as
a standalone switch or in a stack of up
to 8 switches and 192 ports, that can be
easily managed as a single unit. Advanced
features such as VLAN support,
MultiLink Trunking, Simple Network
Management Protocol (SNMP) and
flexible management tools help you to
efficiently manage your network traffic.
The BayStack* 420-24T Switch is a
stackable 10/100/1000 layer 2 Ethernet
switch featuring easy configuration and
stackability, flexible choices for high-speed
uplinks, and web-based management
from your web browser.
Combining high port density with low
per-port pricing for a cost-effective
switching solution, the BayStack 420-24T
Switch is designed for the requirements
of small- to medium-sized businesses
and branch offices that consider
advanced networking functionality
such as:
• High-density, cost-effective desktop
switching
• Migration from shared media
• Gigabit uplink to backbone switch
• Cost-Effective Desktop Switching
• Stackable Up to 8 Units
and 192 Ports
• Built-in Stacking Connectors
• Easy to Use
• Easy Web-Based Management
• 1U High Compact Design with
Lower Power Consumption
forwarding and filtering across all ports
at wirespeed performance, with a peak
forwarding rate of 5.1 million packets
per second with no packet loss.
Flexible High-Speed
Uplink Options
BayStack 420-24T Switch offers a built-in
GBIC (Gigabit Interface Converter) slot
in the front of the unit that provides
high-speed connection to backbone
switches or servers. A variety of GBIC
module options gives you flexibility in
fiber interfaces to connect to distant
servers or a larger network, including
SX, LX, XD (50 km) and ZX (70 km)
for long haul connectivity.
MultiLink Trunking
MultiLink Trunking (MLT) enables
grouping of links between the switch
and another switch or a server to provide
higher bandwidth of up to 800 Mbps.
The BayStack 420-24T Switch supports
up to 6 MLTs per switch or per stack
with up to 4 10/100 ports per MLT.
Advanced VLAN Support
Up to 32 port-based VLANs can be
established for each switch, to extend the
broadcast domain and segment network
traffic for higher network efficiency.
802.1Q VLAN Tagging is supported on
every port of the switch, allowing efficient
means of transporting broadcast domains
across switches. VLANs reduce administration costs by simplifying network
moves, adds, and changes.
Enterprise-Sized
MAC Address Table
The BayStack 420-24T Switch supports
up to 8,000 MAC addresses to provide
ample scalability for growing networks to
accommodate many attached devices and
workgroups connected to each switch.
BayStack 420-24T Switch Product Brief2
Figure 1: The plug and play
architecture allows
easy expansion, and
management as a
single unit.
Features and Benefits
Full Autosensing
on Every Port
Every UTP port on the BayStack 420-24T
Switch is equipped with autosensing
technology to automatically detect and
support the speed and mode of a connected
device. Determining whether a connected
device is operating at 10 Mbps or 100
Mbps, and automatically adjusting to the
optimal speed, each of the 24 switched
ports also automatically detects and
supports full-duplex connections to
servers, power-user endstations or other
switches, as well as half-duplex connections
to legacy NICs or hubs.
Auto-polarity
BayStack 420 Switch saves money and
time if it needs to be connected to a hub
or another switch. Normally, you need
a cross-over cable for this purpose, but
with BayStack 420 Switch you can use an
inexpensive straight-through cable or a
cross-over cable. When a cable is connected
to a port on the BayStack 420 Switch, the
switch port automatically detects the
polarity of the cable and configures itself.
Also, this feature makes configuration
easier as it eliminates the need for an
MDI/MDIX port and any port may be
used for connection to a hub or switch.
High-Density
Stacking Architecture
The plug and play cascade stacking
architecture allows you to connect up
to 8 BayStack 420-24T Switches with
stack cables (see Figure 1) into a single
manageable unit of up to 192 ports.
Built-in Gigabit stacking connectors
provide easy connections to other switches
in the stack and save money by not
requiring additional cascade modules.
Cascading bandwith is 1Gbps. The scalable
architecture is designed to protect your
network investment, as your business
needs change or grow, and allows you
to cost-effectively buy as you grow.
Wire-Speed Throughput
A 12.8 Gigabit per second (Gbps)
switching fabric and ASICS support full
802.1D-compliant MAC Layer frame
BayStack 420-24T Switch Product Brief 3
Figure 2: Typical small/medium business
application – single-floor.
RJ-45 Connectors
Wired for MDI-X
All 10/100 autosense Ethernet port
connectors are wired for MDI-X
connections to other devices. Inexpensive
straight-through unshielded twisted pair
(UTP) cables can be used to provide
switch connections to servers, desktops,
and internetworking devices.
Power and Space Savings
Low power consumption of 50W results
in lower operating costs. 1U high unit
with smaller footprint saves space.
Supports Spanning
Tree Protocol
Built-in support for Spanning Tree
Protocol (IEEE 802.1D) detects and
eliminates logical loops in the network.
When multiple paths exist, the switch
will automatically place some ports on
standby to form a network with the most
efficient traffic pathways, avoiding the
continual looping of frames.
Flexible Management
Platforms
Web-based network management makes
managing the BayStack 420-24T Switch
or stack easy with a web browser. Plus,
the stack can be managed as a single entity
with one IP address. Furthermore,
the BayStack 420-24T Switch can be
configured and managed by using the
Java Device Manager Software, which
can be downloaded free from the Nortel
Networks web site, or by using Optivity*
NMS software.
Advanced Management
Features
BootP and TFTP support allows
centralized switch IP address assignment,
software upgrades, and SNMP agent
updates over the network. The RADIUSbased security feature uses the RADIUS
(Remote Authentication Dial-In User
Services) protocol to authenticate local
console and TELNET logins.
BaySecure Secure LAN Access
BaySecure security feature allows
authentication of all access, not only
to the switches for management and configuration, but access to the infrastructure
through these switches. This software
feature limits access to the network to
authorized and trusted users with full
tracking of network connections.
Concurrent RMON
on Every Port
This enables standards-based RMON
managers and Optivity applications to
manage the network, as well as the
devices, with four groups of RMON
(Alarms, Events, History, and Statistics)
on every port.
Port Mirroring
Port mirroring copies packets flowing into
a specified port and sends the replicated
data to the mirrored port for in-depth
analysis of switched traffic patterns to
trouble-shoot problems and optimize
network configurations.
Recovery Configuration
File Support
The configuration file feature allows for
storing of switch or stack configuration
parameters on a TFTP server.
Configuration parameters can be retrieved
automatically to configure a replacement
switch or stack with the same configuration.
For new installations or when a switch
has failed, this feature saves time in
reconfiguring another switch or stack.
Figure 3: Typical medium business
application – multi-floor.
Stack of BayStack
420 Switches
MultiLink
ARN
Router
WAN
Trunking
Desktop
PCs
Servers
Gigabit
Uplinks
Distributed
MultiLink
Trunking
Stacks of BayStack
420 Switches
BayStack 450/BPS
switch stack
Servers
Fail-safe Stacking
ARN
Router
Floor 3
Floor 2
Floor 1
Desktop
PCs
WAN
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