DS0-MIB

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Organization: IETF Trunk MIB Working Group

Last Updated: 1998-07-16

Category: Network Interfaces

Description: Provides managed objects for DS0 interfaces (64 kbps digital signal level 0), used within TDM circuits in telecommunications networks.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring DS0-MIB with a free 30-day trial of IPNetwork Monitor.

What Is DS0-MIB?

DS0-MIB is a vendor-neutral IETF standards-track MIB (RFC 2494) that defines managed objects for DS0 interfaces, individual 64 kbps digital signal level 0 channels that are the basic building blocks of T1/E1 time-division-multiplexed (TDM) telecommunications circuits. It exposes per-channel configuration such as robbed-bit signaling mode, circuit identifier, idle/seized line codes, and mapping of DS0 channels into higher-level bundles/interfaces. This is a circuit configuration and status MIB used to monitor the software/hardware-facing state of TDM channels, verifying that a channel's signaling mode and codes match what's expected, and that its mapping into a DS0 bundle (dsx0Ds0BundleMappedIfIndex) is correct, which helps detect line-coding mismatches or misconfigured channel groupings that cause voice/data circuit errors. It is designed to work alongside other IETF TDM MIBs such as the DS1/E1-MIB and DS3-MIB, forming a layered stack of physical/logical TDM interface MIBs. It is deployed on channelized T1/E1 interfaces in telecom carrier equipment, PBXs, and channel banks that terminate individual voice/data DS0 timeslots. Engineers implementing or auditing this functionality typically reference the DS0-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in DS0-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

vendor-neutral, standards-based IETF MIB, not tied to a specific manufacturer
channelized T1/E1 telecom equipment (channel banks, PBXs, carrier multiplexers)

Monitoring Examples

An operator would poll dsx0ConfigTable/dsx0ConfigEntry indexed by dsx0Ds0ChannelNumber to check dsx0RobbedBitSignalling, dsx0IdleCode, and dsx0SeizedCode settings on a channel, catching a signaling mismatch that would cause dropped or garbled calls on that timeslot. Checking dsx0ChanMappingTable/dsx0ChanMappingEntry and dsx0Ds0BundleMappedIfIndex would confirm which DS0 channels are correctly bundled into a higher-rate interface, revealing a misconfigured channel group if expected timeslots are missing from a bundle.

What Can Be Monitored

DS0 channel signaling mode
circuit identifier
idle/seized line codes
DS0-to-bundle channel mapping

Imported Objects

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero
ifIndex	OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE
transmission

From SNMPv2-TC

DisplayString
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
ds0	1.3.6.1.2.1.10.81			The MIB module to describe DS0 interfaces objects.
dsx0ConfigTable	1.3.6.1.2.1.10.81.1		not-accessible	The DS0 Configuration table.
dsx0ConfigEntry	1.3.6.1.2.1.10.81.1.1		not-accessible	An entry in the DS0 Configuration table. There is an entry in this table for each DS0 interface.
INT dsx0Ds0ChannelNumber	1.3.6.1.2.1.10.81.1.1.1	INTEGER	read-only	This object indicates the channel number of the ds0 on its DS1/E1.
T/F dsx0RobbedBitSignalling	1.3.6.1.2.1.10.81.1.1.2	TruthValue	read-write	This object indicates if Robbed Bit Signalling is turned on or off for a given ds0. This only applies to DS0s on a DS1 link. For E1 links the value is always off (false).
STR dsx0CircuitIdentifier	1.3.6.1.2.1.10.81.1.1.3	DisplayString	read-write	This object contains the transmission vendor's circuit identifier, for the purpose of facilitating troubleshooting.
INT dsx0IdleCode	1.3.6.1.2.1.10.81.1.1.4	INTEGER	read-write	This object contains the code transmitted in the ABCD bits when the ds0 is not connected and dsx0TransmitCodesEnable is enabled. The object is a bitmap and the various bit positions are: 1 D bit 2 C bit 4 B bit 8 A bit
INT dsx0SeizedCode	1.3.6.1.2.1.10.81.1.1.5	INTEGER	read-write	This object contains the code transmitted in the ABCD bits when the ds0 is connected and dsx0TransmitCodesEnable is enabled. The object is a bitmap and the various bit positions are: 1 D bit 2 C bit 4 B bit 8 A bit
INT dsx0ReceivedCode	1.3.6.1.2.1.10.81.1.1.6	INTEGER	read-only	This object contains the code being received in the ABCD bits. The object is a bitmap and the various bit positions are: 1 D bit 2 C bit 4 B bit 8 A bit
T/F dsx0TransmitCodesEnable	1.3.6.1.2.1.10.81.1.1.7	TruthValue	read-write	This object determines if the idle and seized codes are transmitted. If the value of this object is true then the codes are transmitted.
NUM dsx0Ds0BundleMappedIfIndex	1.3.6.1.2.1.10.81.1.1.8	InterfaceIndexOrZero	read-only	This object indicates the ifIndex value assigned by the agent for the ds0Bundle(82) ifEntry to which the given ds0(81) ifEntry may belong. If the given ds0(81) ifEntry does not belong to any ds0Bundle(82) ifEntry, then this object has a value of zero. While this object provides information that can also be found in the ifStackTable, it provides this same information with a single table lookup, rather than by walking the ifStackTable to find the possibly non-existent ds0Bundle(82) ifEntry that may be stacked above the given ds0(81) ifTable entry.
ds0Conformance	1.3.6.1.2.1.10.81.2
ds0Groups	1.3.6.1.2.1.10.81.2.1
ds0ConfigGroup	1.3.6.1.2.1.10.81.2.1.1			A collection of objects providing configuration information applicable to all DS0 interfaces.
ds0Compliances	1.3.6.1.2.1.10.81.2.2
ds0Compliance	1.3.6.1.2.1.10.81.2.2.1			The compliance statement for DS0 interfaces.
dsx0ChanMappingTable	1.3.6.1.2.1.10.81.3		not-accessible	The DS0 Channel Mapping table. This table maps a DS0 channel number on a particular DS1/E1 into an ifIndex.
dsx0ChanMappingEntry	1.3.6.1.2.1.10.81.3.1		not-accessible	An entry in the DS0 Channel Mapping table. There is an entry in this table corresponding to each ds0 ifEntry within any interface that is channelized to the individual ds0 ifEntry level. This table is intended to facilitate mapping from channelized interface / channel number to DS0 ifEntry. (e.g. mapping (DS1 ifIndex, DS0 Channel Number) -> ifIndex) While this table provides information that can also be found in the ifStackTable and dsx0ConfigTable, it provides this same information with a single table lookup, rather than by walking the ifStackTable to find the various constituent ds0 ifTable entries, and testing various dsx0ConfigTable entries to check for the entry with the applicable DS0 channel number.
NUM dsx0ChanMappedIfIndex	1.3.6.1.2.1.10.81.3.1.1	InterfaceIndex	read-only	This object indicates the ifIndex value assigned by the agent for the individual ds0 ifEntry that corresponds to the given DS0 channel number (specified by the INDEX element dsx0Ds0ChannelNumber) of the given channelized interface (specified by INDEX element ifIndex).

RFC description

Defines managed objects for DS0 (64 kbps digital signal level 0) interfaces used in telecommunications TDM circuits.

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Download DS0-MIB

What Is DS0-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description