Nortel BayStack 5520-24T-PWR, BayStack 5520-48T-PWR Specifications
T
he way in which businesses use LANs is changing and the performance requirement at
the edge of the network is becoming more demanding. IP Telephony and other collaborative applications are driving more traffic to the edge of the network. As file sizes continue to
grow, users need more bandwidth. Quite simply, the convergence of voice, video, data, and
storage enables users to do more from their desktop. Enterprises need to be able to address
today’s increased demands and still prepare for the unknown demands of tomorrow. By
re-assessing how they’re using the wiring closet, they can achieve both goals, and be assured
that their investments will be protected for a long time to come.
Product Brief
Nortel Networks
BayStack 5520 Switches
power over ethernet
gigabit connectivity
Figure 1. The BayStack 5520-24T-PWR
Switch (top) and BayStack 5520-48T-PWR
Switch (bottom)
BayStack 5520 Switch benefits
• Power to IP phones, wireless access points, network cameras, security and lighting devices,
and access control devices
• Provides power on all ports
• IEEE 802.3af compliant to power multiple vendors’ equipment
• Enables data and power to be transmitted over a single cable without using power outlets
• Automatically provides power to a detected device
• Up to 384 ports of Gigabit desktop connectivity in an 8-rack unit high design—the highest
density in the industry
• Industry-leading Gigabit Ethernet performance with innovative stacking using FAST stack
(Flexible Advanced Stacking Technology)—providing up to 640 Gbps
• High-performance switch fabric of 160 Gbps assures wire-speed operation with no packet loss
• Hardware-based Layer 3 routing at wire-speed and across the stack
• Intelligence at the network edge with Quality of Service (QoS)
• Cost-effective plug-and-play stacking with built-in stacking ports
• Up to 32 built-in SFP GBIC uplink ports in a stack
• Flexible stacking across all BayStack 5000 series switches—a stack is managed as a single
entity with a single IP address
• Unmatched resilient connectivity and stackability for minimal network downtime
• Secure access and data traffic protection
• All BayStack switches come with a lifetime warranty
high-performance
Power over Ethernet (PoE) technology provides power and data connectivity to devices such
as Internet telephones, wireless access points, network cameras, security and lighting devices,
and access control devices. According to IDC’s Worldwide Power over Ethernet 2004-2008
Forecast and Analysis report, the Power over Ethernet market revenue is expected to grow at
an 8.9 percent CAGR (compound annual growth rate) over the next five years.
Part of Nortel Networks BayStack 5000 Series, BayStack 5520 Switches are one rack unit
high stackable 10/100/1000 Mbps Ethernet Layer 3 routing switches designed to provide
high-density Gigabit desktop connectivity and Power over Ethernet capability to mid-size
and large enterprise customers’ wiring closets.
Available in two models (Figure 1)—BayStack 5520-48T-PWR Switch with 48 10/100/
1000BASE-T RJ-45 ports, and BayStack 5520-24T-PWR Switch with 24 10/100/1000
BASE-T RJ-45 ports—they feature four built-in SFP GBIC ports for uplink. Both models
may be stacked with each other or themselves, in stacks of eight units, to achieve a maximum
of 384 10/100/1000 ports for high-density desktop switching. These models will also be able
to stack with the BayStack 5510 Switches and future BayStack 5000 models.
Highest-density Gigabit desktop switching
The BayStack 5520-48T-PWR PoE Switch features 48 10/100/1000
BASE-T RJ-45 ports for desktop switching and four built-in SFP (Small
Form Factor Pluggable) GBIC ports for uplink. Ports 45, 46, 47, and 48
offer configuration flexibility by allowing the network administrator to
configure each port as either 10/100/1000 or make use of the built-in SFP
GBIC. However, power will still be provided from ports 45-48 and can
be used to troubleshoot or power any 802.3af compliant device that only
requires power and not a data connection. As many as eight BayStack
5520-48T-PWR Switches can be stacked to achieve up to 384
10/100/1000 ports for highest-density desktop switching.
The BayStack 5520-24T-PWR PoE Switch offers 24 10/100/1000BASE-T
RJ-45 ports for desktop switching and four built-in GBIC ports for uplink.
Ports 21, 22, 23, and 24 offer configuration flexibility as either a 10/100/
1000 or a built-in SFP GBIC port. However, power will still be provided
from ports 21-24 and can be used to troubleshoot or power any 802.3af
compliant device that only requires power and not a data connection.
Both BayStack 5520-24T-PWR and BayStack 5520-48T-PWR Switches
may be combined in a single stack for maximum flexibility.
IEEE 802.3af compliant
The BayStack 5520 Switches are IEEE 802.3af compliant. They can
provide Power over Ethernet to any IEEE 802.3af compliant device such as
IP phones, wireless access points, network cameras, security and lighting
devices, and access control devices. The benefit of being interoperable with
standards-based equipment means that customers are not forced to tie
themselves to any one vendor, as the switches have the flexibility to power
multiple vendors’ devices. The BayStack 5520-48T-PWR Switch can
supply power up to 15.4 W per port (with the addition of the BayStack 15
PSU and RPSU module). Without BayStack 15 Power Supply Unit
(PSU), the BayStack 5520-48T Switch would supply an average of 6.5 W
per port (ports can exceed 6.5 W per port as long as the total of all ports
requiring power does not exceed 320 W). The BayStack 5520-24T-PWR
Switch can supply up to 15.4 W per port as well (with the addition of the
BayStack 15 PSU). Without BayStack 15 PSU, the BayStack 5520-24TPWR Switch would supply an average of 13 W per port (ports can exceed
13 W per port as long as the total of all ports requiring power does not
exceed 320 W).
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Figure 2. Innovative FAST stacking
640 Gbps maximum stacking
bandwidth for the stack
80 Gbps
80 Gbps
80 Gbps
80 Gbps
80 Gbps
80 Gbps
80 Gbps
80 Gbps
Upstream traffic
40 G
bps
40 Gbps
Downstream traffic
80 Gbps maximum stacking
bandwidth for the stack
40 Gbps
40 Gbps 40 Gbps 40 Gbps 40 Gbps
40 Gbps
40 Gbps 40 Gbps 40 Gbps
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Auto discovery feature
The BayStack 5520 Switches automatically recognize the connection of a Power over
Ethernet device and immediately send power to it. This automatic capability ensures fast
connectivity without manual intervention.
Dynamic power management
Each port can be configured to limit the power delivered to a device. Each port can also be
configured for power priority level—low, high, and critical. On the switch, total available
power is monitored. In the case where all available power is fully utilized, the switch may
turn off lower priority ports and turn on higher priority ports.
Active circuit protection
The BayStack 5520 Switches can automatically disable a port if there is a short. All the other
ports on the switch will remain active and will not be affected by the disabled port.
Plug-n-play IP Telephony switching
The BayStack 5520 Switches provide simplified Web-based configurations on data and
power properties. The graphical user interfaces make it simple to set up data and power
configurations.
Convenience of a single cable
With the BayStack 5520 Switches, data and power can be transmitted over
one cable without using a power outlet. There is no need for a separate
cable connecting the device to a power outlet.
Significant space and cost savings
Traditionally, a mid-span patch panel device connects via a UTP cat 5 cable
to a standard Ethernet switch and then the mid-span patch panel device sends
power over another standard UTP cat 5 cable to the device such as an IP phone
needing power. In essence, two units are needed for Power over Ethernet capability. In
contrast, a BayStack 5520 Switch integrates standard LAN switch functionality with the
power over UTP cable capability of a mid-span patch panel into one unit. This results in
significant cost and space savings.
Innovative FAST stacking design
Nortel Networks innovative FAST (Flexible Advanced Stacking Technology) stacking design
of the BayStack 5520 allows for simultaneous bi-directional traffic flow on each stacking port
(Figure 2). In a full stack, this design yields up to 640 Gbps—the highest stacking bandwidth
in the industry today.
Switch fabric architecture offering non-blocking wire-speed performance
The BayStack 5520 Switches have a high performance Layer 3 switching fabric with a
maximum of 160 Gbps forwarding bandwidth and wire-speed performance. The forwarding
rate for the BayStack 5520-48T-PWR is 71.4 Mpps (million packets per second) and for the
BayStack 5520-24T-PWR is 35.7 Mpps.
Layer 3 switching
The BayStack 5520 Switch architecture supports wire-speed Layer 3 IP switching across the
stack with static and local route support.
The BayStack 5520 switches support high-performance wire-speed IP routing between
VLANs. IP routing with static routes at the edge improves the network performance as the
packets do not have to go to the core and the routing takes place within the switch or stack.
To configure IP routing on the BayStack 5520 Switches or stack, you must use virtual LANs
(VLANs) to create IP interfaces. You can create IP interfaces by assigning an IP address to a
VLAN. Once VLANs are created, you must also create static routes between the BayStack
5520 Switches and the end device.
Figure 3. Recessed stack connectors
Recessed connectors
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The BayStack 5520 Switches support the DHCP (Dynamic Host Configuration
Protocol) Relay feature that provides the system with the ability to relay DHCP
requests to the DHCP server and eliminates the need for a DHCP server on every
subnet. It forwards a request for an IP address from a client to a DHCP server
across subnets.
Software feature enhancements are planned to include support for routing protocols
such as Routing Information Protocol (RIP v1/v2)†.
Compact form factor
The BayStack 5520 Switches are offered in a compact one-rack unit high design. An
eight unit stack provides up to 384 10/100/1000 ports. This allows for significant
space and cost savings in the wiring closet.
Up to 32 built-in GBIC ports in a stack
BayStack 5520 Switches have four built-in SFP GBIC ports for dedicated uplink
connectivity to network core switches such as the Passport 8600. This increases the
uplink bandwidth as GBIC ports are not required for stacking purposes. Using the
proven Distributed Multi-Link Trunking (DMLT) resiliency feature, up to 32 GBIC
ports are available for pure uplink connectivity in a full stack—among the highest in
the market. BayStack 5000 Switches have also been architected to support future
technologies such as 10 Gigabit uplinks.
Plug-and-play stacking with built-in stacking ports
BayStack 5520 Switches have built-in stacking ports for faster, plug-and-play stacking. This is more cost-effective as cascade modules are not required. This stacking
design frees up both of the uplink ports for dedicated connectivity to the backbone.
BayStack 5520 Switches include a cascade cable (1.5 feet). In addition, cascade cables
are available in different lengths—1.5 feet, 10 feet, and 5 meters (16.4 feet)—to cover
a variety of stacking needs.
Recessed stacking connectors for higher reliability
BayStack 5520 Switches are designed with recessed stacking connectors that save premium
closet space and protect the integrity of the stack from accidental contact (Figure 3).
BoSS (BayStack operating system Switching Software)
BoSS for BayStack 5000 Switches is a single software image that allows BayStack 5520-48TPWR, 5520-24T-PWR, 5510-48T, 5510-24T, and future BayStack 5000 models to stack
together. BoSS for BayStack 5000 Switches is specific to this next generation of stacking
switches, with a software image that supports this new architecture. Earlier BayStack
switches support a different version of BoSS—although all share the same core software.
Simplified network operations
BoSS simplifies network operations by reducing the number of steps required for switch
software updates. With BoSS, only a single image needs to be downloaded from Nortel
Networks support site for all BayStack 5000 Switch types. Loading the image to different
switches is also considerably simplified. The image is loaded only to the base unit of the stack
which automatically loads it to other switches in the stack.
Figure 4. Distributed Multi-Link Trunking
(DMLT) across stack
DMLT across stack with
load-balancing and failover
protection for uninterrupted
access to servers or the
network center
BayStack 5520
stack
Server
Passport 8600
BoSS v4.1 features
Newly released BoSS version 4.1 is included with the BayStack 5520 Switches and is downloadable from the Web for free for BayStack 5510 Switch users. It includes support for the
following new features:
• IEEE 802.3ad Link Aggregation
• Default IP address
• Auto unit replacement (config only)
• Simple Network Time Protocol (SNTP)
• System Classifier (Offset Filtering)
• Syslog
• Web Quick Start
• Port Shaping
• 802.1x Enhancements (Multiple Hosts/Multiple Authentication and Guest VLAN)
IEEE 802.3ad Link Aggregation
IEEE 802.3ad provides an industry-standard method for bundling multiple links together
to form a single trunk between two networking devices. BoSS 4.1 supports both Dynamic
Link Aggregation Group (LAG) trunks and MLT trunks. Once configured, the Link
Aggregation Group or trunk group is managed by the Link Aggregation Control Protocol
(LACP). BayStack supports both Link Aggregation and MLT groups. Up to six LAG or MLT
groups are supported. The maximum number of active links per group is four. The Link
Aggregation allows more than four links to be configured in one Link Aggregation group
(LAG). The first four high priority links will be active links and the lower priority link will be a
standby link. When one of the active links goes down, the standby link will become active. This
feature can be implemented by using Command Line Interface, Device Manager, or SNMP.
Default IP address
Customers can discover, manage, and configure the switches remotely without having to
assign a new IP address to the unit. The default IP address and subnet mask set for the
switch/stack will be 192.168.192.168/255.255.255.0 and can be set via the front panel
User Interface button.
Auto unit replacement (config only)
Users can replace a failed unit in the stack without having to re-configure the new unit after
placing it in the stack. For this feature to work, the unit that is being replaced must have
BoSS v4.1. The next software release will not require the unit being replaced have the same
version as the new unit being added.
Simple Network Time Protocol (SNTP)
With this feature, synchronization of the switch or stack’s clock to the real-time clock on the
SNTP server is allowed. If the system (switch or stack) uses SNTP, then SNTP time is used
to time-stamp system log (Syslog) messages. If SNTP is not in use, then the system uses a
time-stamp relative to boot time.
System Classifier (Offset Filtering)
Users can now define their own filters using any 32 bytes in the first 80 bytes of the packet
for more QoS granularity. This gives greater classification capabilities on the switch; the user
is no longer limited to just using certain protocol header fields such as VLAN ID, IP source
address, or IP protocol field for classification.
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Nortel Networks unique FAST stack-
ing design supports an optimal
data flow across the stack using a
shortest path algorithm.
Most vendors today employ a
traditional ring architecture,
meaning that a packet travels on
the ring in only one direction.
For example, in a stack of eight
switches, if a packet needs to go
from unit 2 to unit 3, it can get there
in a single hop. But if a packet needs
to go from unit 3 to unit 2, then it
has to traverse from 3 to 4, 4 to 5, 5
to 6, and so on until it reaches unit 2.
This requires seven hops. Nortel
Networks FAST stack design uses
the shortest path algorithm, which
means that the packet would
traverse directly from unit 3 to
unit 2 in a single hop.
.
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