Unisphere-Data-FRACTIONAL-T1-MIB

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Organization: Unisphere Networks, Inc.

Last Updated: 2000-09-26

Category: Juniper Unisphere ERX Routing

Description: Manages Unisphere ERX fractional T1 channel group configuration and timeslot assignment.

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What Is Unisphere-Data-FRACTIONAL-T1-MIB?

Unisphere-Data-FRACTIONAL-T1-MIB is a Unisphere Networks (later Juniper ERX) MIB for managing fractional T1 (channelized) circuit configuration on their ERX edge routers, allowing a subset of a T1's 24 timeslots to be grouped into a sub-rate data channel. It exposes a table for creating and configuring fractional T1 interfaces, including timeslot map/rate, data polarity, and loopback configuration, layered on top of an underlying physical T1 interface. This is primarily a configuration/provisioning MIB for fractional T1 channel groups; its status-monitoring value comes from usdFt1IfRowStatus (confirming a fractional T1 interface is active) and usdFt1IfLoopbackConfig (revealing if a circuit has been placed into loopback for testing, which would explain a customer-facing traffic outage). It depends on the standard T1/DS1 MIB conventions for the underlying physical interface referenced by usdFt1IfLowerIfIndex. Typical deployment is on Unisphere/Juniper ERX edge routers used by carriers to provision sub-T1-rate leased-line services to customers, where Unisphere-Data-FRACTIONAL-T1-MIB SNMP monitoring verifies channel configuration and loopback state.

IPNetwork Monitor allows you to monitor SNMP objects defined in Unisphere-Data-FRACTIONAL-T1-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

Unisphere Networks / Juniper ERX edge routers

Monitoring Examples

An operator would poll usdFt1IfTable (usdFt1IfEntry) for a given usdFt1IfIndex, checking usdFt1IfRowStatus to confirm the fractional interface is active and usdFt1IfLowerIfIndex to identify the parent T1 physical interface it rides on. The usdFt1IfTimeSlotMap and usdFt1IfTimeSlotRate show which timeslots and at what rate are allocated to this channel, while usdFt1IfLoopbackConfig reveals whether the circuit is currently in a loopback state -- a common cause of a customer circuit reporting no traffic despite the underlying T1 being up. usdFt1IfDataPolarity would be checked if a customer reports bit errors traceable to inverted line polarity.

What Can Be Monitored

fractional T1 channel row status
timeslot map and rate allocation
loopback configuration state
data polarity setting
parent T1 interface mapping

Imported Objects

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

RowStatus

From Unisphere-Data-MIBs

usDataMibs

MODULE-IDENTITY

From Unisphere-Data-TC

UsdNextIfIndex
UsdTimeSlotMap

OIDs

OID symbolic	OID numeric	Type	Access	Description
usdFt1MIB	1.3.6.1.4.1.4874.2.2.6			The Fractional T1 MIB for the Unisphere Networks Inc. enterprise.
usdFt1Objects	1.3.6.1.4.1.4874.2.2.6.1
USD usdFt1NextIfIndex	1.3.6.1.4.1.4874.2.2.6.1.1	UsdNextIfIndex	read-only	Coordinate ifIndex value allocation for entries in usdFt1IfTable. A GET of this object returns the next available ifIndex value to be used to create an entry in the associated interface table; or zero, if no valid ifIndex value is available. This object also returns a value of zero when it is the lexicographic successor of a varbind presented in an SNMP GETNEXT or GETBULK request, for which circumstance it is assumed that ifIndex allocation is unintended. Successive GETs will typically return different values, thus avoiding collisions among cooperating management clients seeking to create table entries simultaneously.
usdFt1IfTable	1.3.6.1.4.1.4874.2.2.6.1.2		not-accessible	This table contains entries for FT1 interfaces present in the system.
usdFt1IfEntry	1.3.6.1.4.1.4874.2.2.6.1.2.1		not-accessible	Each entry describes the characteristics of an FT1 interface. Creating/deleting entries in this table causes corresponding entries for be created /deleted in ifTable/ifXTable/usdIfTable.
NUM usdFt1IfIndex	1.3.6.1.4.1.4874.2.2.6.1.2.1.1	InterfaceIndex	not-accessible	The ifIndex of the FT1 interface. When creating entries in this table, suitable values for this object are determined by reading usdFt1NextIfIndex.
ROW usdFt1IfRowStatus	1.3.6.1.4.1.4874.2.2.6.1.2.1.2	RowStatus	read-create	Controls creation/deletion of entries in this table according to the RowStatus textual convention, constrained to support the following values only: createAndGo destroy To create an entry in this table, the following entry objects MUST be explicitly configured: usdFt1IfRowStatus usdFt1IfLowerIfIndex usdFt1IfTimeSlotMap In addition, when creating an entry the following conditions must hold: A value for usdFt1IfIndex must have been determined previously, by reading usdFt1NextIfIndex. The DS1 interface identified by usdFt1IfLowerIfIndex must exist. The DS0s specified in usdFt1IfTimeSlotMap must be available (unallocated) on the DS1 interface identified by usdFt1IfLowerIfIndex. A corresponding entry in ifTable/ifXTable/usdIfTable is created/destroyed as a result of creating/destroying an entry in this table.
NUM usdFt1IfLowerIfIndex	1.3.6.1.4.1.4874.2.2.6.1.2.1.3	InterfaceIndexOrZero	read-create	The ifIndex of a DS1 interface over which this FT1 interface is to be layered. A value of zero indicates no layering. An implementation may choose to require that a nonzero value be configured at entry creation.
USD usdFt1IfTimeSlotMap	1.3.6.1.4.1.4874.2.2.6.1.2.1.4	UsdTimeSlotMap	read-create	A bitmap representing the DS0s on the underlying DS1 interface that have been allocated to this FT1 interface.
INT usdFt1IfTimeSlotRate	1.3.6.1.4.1.4874.2.2.6.1.2.1.5	INTEGER	read-create	Data rate per time slot allocated to this FT1 interface.
INT usdFt1IfDataPolarity	1.3.6.1.4.1.4874.2.2.6.1.2.1.6	INTEGER	read-create	Polarity of data transmitted on this FT1 interface. Inverted data is used for certain line coding configurations to ensure sufficient one's density for timing recovery by the remote end.
INT usdFt1IfLoopbackConfig	1.3.6.1.4.1.4874.2.2.6.1.2.1.7	INTEGER	read-create	Selects loopback configuration. loop(1) causes received data to be looped back out the transmitter.
usdFt1Conformance	1.3.6.1.4.1.4874.2.2.6.4
usdFt1Compliances	1.3.6.1.4.1.4874.2.2.6.4.1
usdFt1Compliance	1.3.6.1.4.1.4874.2.2.6.4.1.1			The compliance statement for entities that implement the Unisphere FT1 MIB.
usdFt1Compliance2	1.3.6.1.4.1.4874.2.2.6.4.1.2			The compliance statement for entities that implement the Unisphere FT1 MIB.
usdFt1Groups	1.3.6.1.4.1.4874.2.2.6.4.2
usdFt1Group	1.3.6.1.4.1.4874.2.2.6.4.2.1			A collection of objects providing management of FT1 interfaces in a Unisphere product.
usdFt1Group2	1.3.6.1.4.1.4874.2.2.6.4.2.2			A collection of objects providing management of FT1 interfaces in a Unisphere product.

RFC description

Juniper Unisphere fractional T1 line management MIB; manages sub-rate DS0 channel bonding and fractional T1 provisioning.

Start monitoring Unisphere Networks / Juniper ERX edge routers (fractional-T1 channel/loopback config status) 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.

Download Unisphere-Data-FRACTIONAL-T1-MIB

What Is Unisphere-Data-FRACTIONAL-T1-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description