DS3-3COM-MIB

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Category: Domain: Telco/Transport

Description: Manages DS3/T3 digital transmission interface configuration and error statistics on 3Com network equipment.

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What Is DS3-3COM-MIB?

The DS3-3COM-MIB is a vendor-specific SNMP module from 3Com (reflected in the accompanying "usr"/"nas" OID branches tied to 3Com's remote-access product lines) that manages DS3/T3 digital transmission interfaces, the 44.736 Mbps WAN circuits used for leased-line and telco trunk connections. It exposes configuration data such as line build-out settings and monitor-port source selection, alongside real-time performance and error statistics like framing code violations, coding violations, severely errored seconds, and unavailable seconds. This makes it a key tool for monitoring the hardware-level health of DS3 line cards and physical transmission quality, since rising error counts directly indicate line degradation, cabling issues, or interface hardware faults. It builds on the conventions of the standard DS3/E3 interface MIB with 3Com-specific extensions layered on top. It is typically deployed on 3Com/U.S. Robotics access routers and channel service units terminating DS3 WAN links in enterprise or carrier access networks, making DS3-3COM-MIB SNMP monitoring a routine part of WAN circuit health checks.

IPNetwork Monitor allows you to monitor SNMP objects defined in DS3-3COM-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

3Com/U.S. Robotics DS3 access routers
3Com channel service units (CSU) with DS3/T3 interfaces

Monitoring Examples

An administrator would poll ds3CurrentTable/ds3CurrentEntry (indexed by ds3CurrentIndex) to read current-interval counters such as ds3CurrentFCPs (framing code violations), ds3CurrentFCCPs (coding violations), ds3CurrentSESLs (severely errored seconds), and ds3CurrentUASCPs (unavailable seconds) for each DS3 port. A sudden spike in ds3CurrentSESLs or ds3CurrentUASCPs on a given ds3CfgIndex would indicate a failing DS3 line or connector, prompting a hardware check. The ds3CfgTable also exposes ds3CfgXmitLineBuildOut and ds3CfgMonitorPortSource for verifying that line configuration matches the far-end telco circuit.

What Can Be Monitored

DS3 line build-out configuration
monitor port source setting
framing code violations (FCPs)
coding violations (FCCPs)
severely errored seconds (SESLs)
unavailable seconds (UASCPs)

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
Gauge
IpAddress
TimeTicks
enterprises
experimental

From RFC1213-MIB

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
usr	1.3.6.1.4.1.429
nas	1.3.6.1.4.1.429.1
ds3	1.3.6.1.4.1.429.1.44
ds3Cfg	1.3.6.1.4.1.429.1.44.1
ds3CfgTable	1.3.6.1.4.1.429.1.44.1.1		not-accessible	The DS3 Configuration Table.
ds3CfgEntry	1.3.6.1.4.1.429.1.44.1.1.1		not-accessible	An entry in the DS3 Configuration Table.
INT ds3CfgIndex	1.3.6.1.4.1.429.1.44.1.1.1.1	INTEGER	read-write	A unique value at the DS3 level in the chassis.
INT ds3CfgXmitLineBuildOut	1.3.6.1.4.1.429.1.44.1.1.1.2	INTEGER	read-write	This object is used to configure the amount of attenuation that is to be applied to the DS3 transmit signal in order to control cross-talk, etc. The settings are for distances of 0-225 feet or 226 to 450 feet. Default=225(1)
INT ds3CfgMonitorPortSource	1.3.6.1.4.1.429.1.44.1.1.1.3	INTEGER	read-write	This object is for designation of monitor port DS1 source. Default=spanLine1(1).
ds3Current	1.3.6.1.4.1.429.1.44.2
ds3CurrentTable	1.3.6.1.4.1.429.1.44.2.1		not-accessible	This table contains various statistics being collected for the current 15 minute interval.
ds3CurrentEntry	1.3.6.1.4.1.429.1.44.2.1.1		not-accessible	An entry in the DS3 current table.
INT ds3CurrentIndex	1.3.6.1.4.1.429.1.44.2.1.1.1	INTEGER	read-only	The index value which uniquely identifies the DS3 interface to which this entry is applicable.
GAU ds3CurrentFCPs	1.3.6.1.4.1.429.1.44.2.1.1.2	Gauge	read-only	This object indicates near end path failure count. The count of LOF or AIS events.
GAU ds3CurrentFCCPs	1.3.6.1.4.1.429.1.44.2.1.1.3	Gauge	read-only	This object indicates far end path failure count. The count of Remote Alarm Indication (RAI) events.
GAU ds3CurrentSESLs	1.3.6.1.4.1.429.1.44.2.1.1.4	Gauge	read-only	The object is the counter associated with the number of Severely Errored Seconds on the line.
GAU ds3CurrentUASCPs	1.3.6.1.4.1.429.1.44.2.1.1.5	Gauge	read-only	This object is the counter associated with the number of Unavailable Seconds for the C-bit parity application.
ds3Interval	1.3.6.1.4.1.429.1.44.3
ds3IntervalTable	1.3.6.1.4.1.429.1.44.3.1		not-accessible	The DS3 Interval Table contains various statistics collected by each DS3 Interface over the previous 24 hours of operation. The past 24 hours are broken into 96 completed 15 minute intervals. Each row in this table represents one such interval (identified by ds3IntervalNumber) and for one specific interface (identified by ds3IntervalIndex).
ds3IntervalEntry	1.3.6.1.4.1.429.1.44.3.1.1		not-accessible	An entry in the DS3 Interval Table.
INT ds3IntervalIndex	1.3.6.1.4.1.429.1.44.3.1.1.1	INTEGER	read-only	The index value which uniquely identifies the DS3 interface to which this entry is applicable.
INT ds3IntervalNumber	1.3.6.1.4.1.429.1.44.3.1.1.2	INTEGER	read-only	A number between 1 and 96, where 1 is the most recently completed 15 minute interval and 96 is the 15 minutes interval completes 23 hours and 45 minutes prior to interval 1.
GAU ds3IntervalSESLs	1.3.6.1.4.1.429.1.44.3.1.1.3	Gauge	read-only	This object is the counter associated with the number of Severely Errored Seconds on the line in the previous 15 minute interval.
GAU ds3IntervalCVCPs	1.3.6.1.4.1.429.1.44.3.1.1.4	Gauge	read-only	This object is the counter associated with the number of near-end path code violations for the C-bit parity application in the previous 15 minute interval.
GAU ds3IntervalUASCPs	1.3.6.1.4.1.429.1.44.3.1.1.5	Gauge	read-only	This object is the counter associated with the number of Unavailable Seconds for the C-bit parity application in the previous 15 minute interval.
ds3Total	1.3.6.1.4.1.429.1.44.4
ds3TotalTable	1.3.6.1.4.1.429.1.44.4.1		not-accessible	The DS3 Total Table contains the cumulative sum of the various statics for the 24 hour period preceding the current interval.
ds3TotalEntry	1.3.6.1.4.1.429.1.44.4.1.1		not-accessible	An entry in the DS3 Total Table.
INT ds3TotalIndex	1.3.6.1.4.1.429.1.44.4.1.1.1	INTEGER	read-only	The index value which uniquely identifies the DS3 interface to which this entry is applicable.
GAU ds3TotalSESLs	1.3.6.1.4.1.429.1.44.4.1.1.2	Gauge	read-only	This object is the counter associated with the number of Severely Errored Seconds on the line in the previous 24 hour interval. Invalid 15 intervals count as 0.
GAU ds3TotalCVCPs	1.3.6.1.4.1.429.1.44.4.1.1.3	Gauge	read-only	This object is the counter associated with the number of near-end path code violations for the C-bit parity application in the previous 24 hour interval. Invalid 15 minute intervals count as 0.
GAU ds3TotalUASCPs	1.3.6.1.4.1.429.1.44.4.1.1.4	Gauge	read-only	This object is the counter associated with the number of Unavailable Seconds for the C-bit parity application in the previous 24 hour interval. Invalid 15 minute intervals count as 0.
ds3TrapEnable	1.3.6.1.4.1.429.1.44.5
ds3TrapEnableTable	1.3.6.1.4.1.429.1.44.5.1		not-accessible	The DS3 Trap eanble table contains the line status change trap enable
ds3TrapEnableEntry	1.3.6.1.4.1.429.1.44.5.1.1		not-accessible	An entry in Ds3 Trap Enable Table
INT ds3TrapEnableIndex	1.3.6.1.4.1.429.1.44.5.1.1.1	INTEGER	read-only	An unique value which identifies the DS3.
INT ds3LineStatusChangeTE	1.3.6.1.4.1.429.1.44.5.1.1.2	INTEGER	read-write	DS3 Line status change trap enable flag
ds3TrapObj	1.3.6.1.4.1.429.1.44.6
ds3TrapObjTable	1.3.6.1.4.1.429.1.44.6.1		not-accessible	DS3 Trap obj table is a pace holder for status string
ds3TrapObjEntry	1.3.6.1.4.1.429.1.44.6.1.1		not-accessible	An entry in DS3 Trap Obj table
INT ds3TrapObjIndex	1.3.6.1.4.1.429.1.44.6.1.1.1	INTEGER	read-only	An unique value for the index
STR ds3StatusObjString	1.3.6.1.4.1.429.1.44.6.1.1.2	DisplayString	not-accessible	For line status string it is a place holder

RFC description

3Com DS3 configuration and monitoring for line build-out and port management.

Start monitoring 3Com/U.S. Robotics access router or channel service unit (DS3/T3 interface) 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 DS3-3COM-MIB

What Is DS3-3COM-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description