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Introduction
Switch Architecture
The switch employs a wire-speed, non-blocking switching fabric. This permits
simultaneous wire-speed transport of multiple packets at low latency on all ports. The
switch also features full-duplex capability on all ports, which effectively doubles the
bandwidth of each connection.
The switch uses store-and-forward switching to ensure maximum data integrity. With
store-and-forward switching, the entire packet must be received into a buffer and
checked for validity before being forwarded. This prevents errors from being
propagated throughout the network.
This switch includes two Gigabit combination ports with RJ-45 connectors and
associated SFP slots. The optional SFP stacking transceiver enables up to eight units
to be connected together through a 1 Gbps stack backplane. The switch stack can be
managed from a master unit using a single IP address.
Power-over-Ethernet Capability
The switch's 24 10/100 Mbps ports support the IEEE 802.3af Power-over-Ethernet
(PoE) standard that enables DC power to be supplied to attached devices using wires
in the connecting Ethernet cable. Any 802.3af compliant device attached to a port can
directly draw power from the switch over the Ethernet cable without requiring its own
separate power source. This capability gives network administrators centralized power
control for devices such as IP phones and wireless access points, which translates into
greater network availability.
For each attached 802.3af-compliant device, the switch automatically senses the load
and dynamically supplies the required power. The switch delivers power to a device
using the two data wire pairs in UTP or STP. Each port can provide up to 15.4 W of
power at the standard -48 VDC voltage. Independent overload and short-circuit
protection for each port allows the switch to automatically shut down a port's power
when limits are exceeded.
Network devices such as IP phones, wireless access points, and network cameras,
typically consume less than 10 W of power, so they are ideal for Power-over-Ethernet
applications.
Network Management Options
With a comprehensive arrange of LED indicators, this switch provides "at a glance"
monitoring of network and port status. The switch can be managed over the network
with a web browser or Telnet application, or via a direct connection to the console port.
The switch includes a built-in network management agent that allows it to be managed
in-band using SNMP or RMON (Groups 1, 2, 3, 9) protocols. It also has an RS-232
serial port (DB-9 connector) on the front panel for out-of-band management. A PC may
be connected to this port for configuration and monitoring out-of-band via a null-modem
serial cable. (See Appendix B for wiring options.)
For a detailed description of the advanced features, refer to the Management Guide.
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Troubleshooting
