All MIBs › RFC1406Ext-MIB
Category: IETF Standards
Description: Provides extended DS1/T1 management objects supplementing the RFC 1406 base MIB definitions.
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What Is RFC1406Ext-MIB?
RFC1406Ext-MIB is a vendor extension MIB that supplements the IETF RFC 1406 base DS1/T1 MIB with additional objects for managing and monitoring T1/DS1 digital circuit interfaces on carrier and telecom access equipment. It exposes configuration and status data for each DS1 link, such as line build-out settings, card type, and port status, alongside loss-of-signal condition flags. Its primary monitoring role is hardware and line status: detecting loss of transmit clock, loss of synchronization, and loss of carrier on each T1 port, which are classic indicators of a failed line card, bad cabling, or upstream carrier outage. It explicitly extends and depends on the base RFC 1406 DS1/E1 MIB, so devices implementing it must also support the standard DS1 MIB tables. It is typically deployed in telecom/WAN access equipment such as CSU/DSUs, T1 cards in routers, or multiplexers terminating DS1 circuits. Engineers implementing or auditing this functionality typically reference the RFC1406Ext-MIB RFC/standard documentation for the authoritative specification.
IPNetwork Monitor allows you to monitor SNMP objects defined in RFC1406Ext-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.
Supported Devices
- T1/DS1 CSU/DSU
- routers or muxes with T1 interface cards
Monitoring Examples
An operator would poll dsx1ExtCfgTable/dsx1ExtCfgEntry, keyed by dsx1ExtCfgLinkIndex, to read dsx1ExtCfgPortStatus and the loss flags dsx1ExtCfgLossTxClock, dsx1ExtCfgLossSync, and dsx1ExtCfgLossCarrier. A port reporting dsx1ExtCfgLossCarrier true alongside an unexpected dsx1ExtCfgPortStatus change would indicate the T1 line has physically dropped, prompting a check of cabling or the carrier's circuit. dsx1ExtCfgLineBuildOut and dsx1ExtCfgCardType help confirm the line is provisioned with the correct build-out for its cable length and that the correct card type is installed.
What Can Be Monitored
- T1 port operational status
- loss of transmit clock
- loss of synchronization
- loss of carrier
- line build-out setting
- card type
Imported Objects
OIDs
RFC description
T1/E1 line interface extensions including configuration, status monitoring, and alarm detection.
Start monitoring T1/DS1 CSU/DSU, routers or muxes with T1 interface cards (vendor extension of RFC 1406) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.