The SM-2503 Link Protector provides a fully managed
automatic link backup capability to three "mission-critical"
10BaseT/100BaseTX Ethernet links. The system protects vital connections to
servers, routers, firewalls, and other key Ethernet devices that require
fail-safe link operation. The SM-2503 operates by non-intrusively monitoring
a "primary" link and, in the event of a failure, automatically switches to
the backup link; or switching can be controlled externally via SNMP, RS232,
Telnet, or front panel commands.
Key Benefits
Non-Intrusive Monitoring of Primary and Backup Network Connections
Automatic Switching in the Event of Link Failure
Full SNMP Management and Control
Special Features for Redundant Firewall Applications
Redundant 48VDC or 100/220VAC Power
PRODUCT DESCRIPTION
The SM-2503 Link Protector provides a fully managed automatic link backup
capability to three "mission-critical" 10BaseT/100BaseTX Ethernet links. The
system protects vital connections to servers, routers, firewalls, and other
key Ethernet devices that require fail-safe link operation. The SM-2503
operates by non-intrusively monitoring a "primary" link and, in the event of
a failure, automatically switches to the backup link; or switching can be
controlled externally via SNMP, RS232, Telnet, or front panel commands. The
Link Protector does not require any additional network cards in a server; is
completely transparent in normal operation; and does not affect IEEE
10BaseT/100BaseT repeater budget. The SM-2503 fills the need for a smaller
port count system (than the larger SM-2512 system) without sacrificing
management or control features. The SM-2503 is ideally sized for backup of
critical servers and/or firewalls and contains sufficient ports to switch
the internal and external connections as well as DeMilitarized Zone (DMZ)
attached proxy segments. The SM-2503 is designed for either tabletop use or
may be mounted in a standard 19" datacom/telecom rack with optional mounting
brackets.
APPLICATIONS
Provide Automatic Backup for Critical 10BaseT/100BaseTX Links to
Servers, Routers, and other Vital Equipment
Protect Attached Equipment From Failures of Primary Link Due to Cable
Cuts, Disconnected Cables, and Hub Failures (Malfunctioning Ports, Plug-in
Cards, or Power Supplies)
Provide Immediate Notification via SNMP of Link Failures
Control Network Configuration/Topology via SNMP Scripts
Simplify Network Maintenance Thru Forced Switching to Hot Standby
SYSTEM FEATURES
Provides and Manages Redundant Connections for 3 10BaseT/100BaseTX
Ports
Automatic Switching to Backup on Loss of Service
Automatic Switch-Back to Primary Link on Restoration of Service
Alarm on Loss of Primary Backup Link and/or Server Links
Telnet Access to Control, Status, and Setup Information
BOOTP Automatic Network Address Recovery
"Ping"-able using ICMP
Simple Network Management Protocol (SNMP)
SNMP Trap Message on Alarm for Link Failure Notification
SNMP MIB II Compliant (RFCs 1155, 1157, 1213)
Port Switching Capabilities include Individual Port, Group, and Gang
Modes
Forced Switchover to Backup, Port Enable/Disable, and Alarm
Acknowledgement Functions Available Through SNMP, RS232, Telnet and Front
Panel Switches
LED Indicators for Transmit, Receive, and Link Status for 10BaseT
Management Port
System Configuration and Firmware Stored in Non-Volatile Upgradeable
EEPROM
110/220V Auto Sensing Redundant Power Supplies (-48VDC Redundant
Optional)
RS-232 Console Interface (300 to 38.4K bps) for System Configuration
Programmable Password Protection
Compatible with SM-2500/SM-250 Single Port Link Protectors
Online Help
PORT FEATURES
Auto Switch to Backup on Loss of Service
Auto Switch to Primary on Restoration of Service
Alarm Notification Via SNMP Traps
Default Connection to Primary Link on Loss of Power
Enable/Disable of Automatic Switching
Capability to Force Port to Backup Condition
Front Panel Display of Link Status on Primary, Backup, and Server
Connections; Alarm Status; Active Connection Status (Primary or Backup);
Port Enable/Disable Status; Override Status
SPECIFICATIONS
Standards: IEEE 802.3 10BaseT/100BaseTX Compliant
Connectors: 3 RJ45 Twisted Pair Per Port for each of 3 Ports, 1 RJ45
Management Port, 1 RJ45 Secondary Management Port, 1 3-Wire 110/220V AC
Power or Optional -48VDC 2-Pin Screw Terminal Power
