4
models with 24 10BaseT ports, two slots, and choice of 2K or 8K MAC
address cache
Choice
of 11 high-speed modules support 100BaseT, FDDI, and ATM
Full-duplex
operation on all ports
Web-based
network interface enables configuration and management form any client
on the internet with a web-browser.
Congestion
control features including IEEE 802.3x-based flow control, and back-pressure
based flow control on 10BaseT ports
Twelve
or twenty-four 10BaseT ports deliver dedicated 10 Mbps of bandwidth
to individual users or workgroups to support bandwidth-intensive applications
Two
high-speed expansion slots maximize high-speed configuration and backbone
flexibility
One
switched Attachment Unit Interface (AUI) port for connecting to fiber
or legacy 10Base2 or 10Base5 networks
Shared-memory
architecture with 3 MB packet buffer virtually eliminates packet loss
Non-blocking,
ClearChannel architecture supports wire-speed bridging on all ports,
delivering up to 370 Mbps maximum forwarding bandwidth, and 550,000
pps aggregate
CollisionFree
full-duplex operation on switched 10BaseT and 100BaseT ports delivers
up to 200 Mbps of bandwidth tend stations, servers and between switches
Choice
of congestion control options for applications that require zero packet
loss:
Enhanced
congestion control accelerates packet forwarding when the switch buffers
are full
Back-pressure
on half-duplex Ethernet ports throttles network transmission using
the IEEE 802.3 Layer 2 back-off algorithm
IEEE
802.3x flow control on 100BaseTX ports provides intelligent flow management
between switches and between a switch and a server
Per-port
broadcast storm control prevents faulty end stations from degrading
overall system performance with broadcast storms
Choice
of cut-through or store-and-forward switching lets administrators
optimize for performance or error checking 1900/2820 by name, rather
than address.
Catalyst
2820 Series Front View
Catalyst
2820 Series Rear View
Technical
Specifications for the Catalyst 2820
Description
Specification
Performance
1 Gbps
bus
370
Mbps maximum forwarding bandwidth
3 MB
packet buffer memory dynamically shared by all ports
Selectable
switching option
FragmentFree
cut-through-forward after collision window (64 bytes)
Store
and forward — forward after packet receipt
Full/half
duplex operation by port
Packet
forwarding rate for 64-byte packets
14,880
packets per second (pps) to 10 Mbps ports
148,800
pps to 100BaseT module ports
Up
to 100,000 pps to FDDI module ports
Up
to 550,500 pps aggregate
Latency
(FragmentFree cut-through switching mode)
70
microseconds between 10BaseT ports
11
microseconds between 100BaseT ports
MAC
addresses
1024
per system (Catalyst 1900 series)
2048
or 8192 per system (Catalyst 2820 series)
Unlimited
MAC address support on configurable network port
Management
SNMP
Management Information Base (MIB) II, SNMP MIB extensions
Station
Management (SMT) 7.3, FDDI MIB, Bridging MIB (RFC 1493)
Standards
IEEE
802.3x full duplex on 10BaseT and 100BaseT ports
IEEE
802.3x flow control on 100BaseT ports
IEEE
802.1d Spanning-Tree Protocol
IEEE
802.3u 100BaseTX and 100BaseFX specifications
IEEE
802.3 10BaseT specification
IEEE
802.3 AUI specification
ATM
Forum LANE 1.0; UNI 3.0/3.1; RFC 1483
Connectors
and Cabling
10
Mbps ports: RJ-45 connectors; two-pair Category 3, 4 or 5 UTP cabling;
DB15 connector on AUI port
