Specification Sheet

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Feature
Description
Other management
Traceroute; single IP management; HTTP/HTTPS; RADIUS; port mirroring; TFTP upgrade;
DHCP client; Simple Network Time Protocol (SNTP); cable diagnostics; Ping; syslog; Telnet
client (SSH secure support); automatic time settings from Management Station
Green (power efficiency)
Energy detect
Automatically turns power off on RJ-45 port when detecting link down. Active mode is
resumed without loss of any packets when the switch detects the link is up
Cable length detection
Adjusts the signal strength based on the cable length. Reduces the power consumption for
shorter cables
EEE compliant (802.3az)
Supports IEEE 802.3az on all copper Gigabit Ethernet ports
Disable port LEDs
LEDs can be manually turned off to save on energy
Time-based port operation
Link up or down based on user-defined schedule (when the port is administratively up)
Time-based PoE
PoE power can be on or off based on user-defined schedule to save energy
General
Jumbo frames
Frame sizes up to 9K bytes. The default MTU is 2K bytes
MAC table
8K addresses
Discovery
Bonjour
The switch advertises itself using the Bonjour protocol
Link Layer Discovery
Protocol (LLDP) (802.1ab)
with LLDP-MED extensions
Link Layer Discovery Protocol (LLDP) allows the switch to advertise its identification,
configuration, and capabilities to neighboring devices that store the data in a MIB. LLDP-
MED is an enhancement to LLDP that adds the extensions needed for IP phones
Cisco Discovery Protocol
The switch advertises itself using the Cisco Discovery Protocol. It also learns the connected
device and its characteristics using Cisco Discovery Protocol
Power over Ethernet (PoE)
802.3at PoE+ and 802.3af
PoE delivered over any of
the RJ-45 ports within the
listed power budgets
The following switches support 802.3at PoE+, 802.3af, and Cisco prestandard (legacy) PoE.
Maximum power of 30.0W to any 10/100 or Gigabit Ethernet port, until the PoE budget for
the switch is reached. The total power available for PoE per switch is as follows:
Model
Power dedicated to PoE
Number of ports that support
PoE
CBS250-8PP-D
45W
8
CBS250-8PP-E-2G
45W
8
CBS250-8P-E-2G
60W
8
CBS250-8FP-E-2G
120W
8
CBS250-16P-2G
120W
16