Fore-DS1-MIB

All MIBs › Fore-DS1-MIB

Organization: FORE

Last Updated: 1999-11-05

Category: ATM, Domain: WAN/TDM, Vendor: Fore Systems (ATM)

Description: Fore Systems DS1 (T1) interface MIB providing physical layer statistics and configuration for DS1 trunk modules in ForeRunner ATM switches.

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What Is Fore-DS1-MIB?

Fore-DS1-MIB is a vendor MIB from Fore Systems (later part of Marconi/ECI) covering DS1 (T1) physical-layer trunk interfaces on ForeRunner ATM switch platforms. It exposes configuration data such as line type, line coding, transmit clock source, loopback settings, and per-port board/module/port identification, alongside line status and statistics groups. In monitoring terms it is used to track hardware and link status of DS1 trunk ports: whether a port is up/down/looped, its physical configuration, and error/performance statistics collected on the line, which together indicate the health of the WAN trunk hardware. It is a standalone Fore-specific extension that complements but does not replace the standard RFC 1406 DS1 MIB. It is typically deployed on legacy ForeRunner ATM edge/core switches carrying T1 trunk circuits in telco or enterprise WAN environments. Engineers can download the Fore-DS1-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Fore-DS1-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

Fore Systems ForeRunner ATM switch
DS1/T1 trunk module

Monitoring Examples

An operator would poll ds1ConfTable/ds1ConfEntry (indexed by ds1ConfBoard, ds1ConfModule, ds1ConfPort) to read ds1LineStatus and confirm a DS1 trunk port is not in a red/yellow alarm or loopback state, cross-checking ds1LineType and ds1LineCoding against expected provisioning. The ds1StatsGroup provides line performance counters that would reveal degrading signal quality (e.g., rising error seconds) before a full outage. Changes surfaced via ds1LoopbackConfig or ds1TxClockSource would also flag a misconfigured or manually looped port.

What Can Be Monitored

DS1 line status
line type and coding configuration
transmit clock source
loopback configuration
per-port board/module identification
line performance statistics

Imported Objects

From Fore-Common-MIB

asx	OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using ds1FramingLOSs OID:

Select a Fore Systems (later Marconi) ForeRunner ATM switch (DS1/T1 trunk port module) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type ds1FramingLOSs into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of seconds in which Loss Of Signal (LOS) errors have been detected. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
foreDs1	1.3.6.1.4.1.326.2.2.1.1.7			Fore DS1 mib module for supporting the DS1 port module.
ds1ConfGroup	1.3.6.1.4.1.326.2.2.1.1.7.1
ds1ConfTable	1.3.6.1.4.1.326.2.2.1.1.7.1.1		not-accessible	A table of DS1 switch port configuration information.
ds1ConfEntry	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1		not-accessible	A table entry containing DS1 configuration information for each port. Not all RFC1406 configuration table variables are included, and some are modified.
I32 ds1ConfBoard	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.1	Integer32	read-only	The index of this port's switch board.
I32 ds1ConfModule	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.2	Integer32	read-only	The network module of this port.
I32 ds1ConfPort	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.3	Integer32	read-only	The number of this port.
INT ds1LineType	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.4	INTEGER	read-only	This variable indicates the variety of DS1 Line implementing this circuit. The type of circuit affects the number of bits per second that the circuit can reasonably carry, as well as the interpretation of the usage and error statistics. This variable is defined in the rfc1406 configuration table as dsx1LineType. According to rfc1406, the different values are: ds1ESF Extended SuperFrame DS1 ds1D4 AT&T D4 format DS1.
INT ds1LineCoding	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.5	INTEGER	read-only	This variable describes the variety of Zero Code suppression used on this link, which in turn affects a number of its characteristics. ds1B8ZS (2) refers to the use of specified pattern of normal bits and bipolar violations which are used to replaced sequences of eight zero bits. This variable is defined in the rfc1406 configuration table as dsx1LineCoding.
INT ds1SendCode	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.6	INTEGER	read-write	This variable indicates what type of code is being sent across the DS1 interface by the device. The values mean: ds1SendNoCode sending looped or normal data ds1SendLineCode sending request for a line loopback ds1SendPayloadCode sending a request for a payload loopback ds1SendResetCode sending a loopback termination request ds1SendQRS sending a Quasi-Random Signal (QRS) test pattern ds1Send511Pattern sending a 511 bit fixed test pattern ds1Send3in24Pattern sending a fixed test pattern of 3 bits set in 24 ds1SendTestPattern sending a test pattern other than the above.
INT ds1ReceiveCode	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.7	INTEGER	read-only	This variable indicates the type of code that was received across the DS interface. The values mean: ds1ReceiveNoCode receiving looped or normal data ds1ReceiveLineCode receiving request for a line loopback ds1ReceivePayloadCode receiving a request for a payload loopback ds1ReceiveResetCode receiving a loopback deactivation request ds1ReceiveQRS receiving a Quasi-Random Signal (QRS) test pattern ds1Receive511Pattern receiving a 511 bit fixed test pattern ds1Receive3in24Pattern receiving a fixed test pattern of 3 bits set in 24 ds1ReceiveTestPattern receiving a test pattern other than the above.
INT ds1LoopbackConfig	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.8	INTEGER	read-write	This variable represents the loopback configuration of the DS1 interface. This variable is defined in the rfc1406 configuration table as dsx1LoopbackConfig, with slightly different values. ds1NoLoop (1) means that the interface is not in a loopback state. ds1LineLoop (2) means that cells that are processed by the receiving component are not written into the receive FIFO, but into the transmit FIFO for retransmission. ds1PayloadLoop (3) means that the receive signal is looped back for retransmission after it has passed through the port's reframing function. ds1DiagLoop (4) means that the transmit data stream is looped back to the receiver. ds1OtherLoop (5) means that the interface is in a loopback that is not defined here.
INT ds1TxClockSource	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.9	INTEGER	read-write	The source of the transmit clock. rxTiming(1) indicated that the recovered receive clock is used as the transmit clock. localTiming(2) indicates that a local source clock is used as the transmit clock. To determine which local source clock is used advise the ntGlobalClock in the netmodTimingTable for this netmod (refer to the Fore-Switch-MIB for more information).
I32 ds1LineStatus	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.12	Integer32	read-only	This variable indicates the Line Status of the interface. A similar object is defined in the rfc1406 configuration table as dsx1LineStatus. The variable contains loopback state information and failure state information. It is a bit map represented as a sum. The ds1NoAlarm should be set if and only if no other flag is set. The various bit positions are: 1 No Alarm. 2 Receiving PLCP Yellow Alarm Indication. 4 Transmitting PLCP Yellow alarm indication. 8 Receiving PLCP LOF. 16 Receiving DS1 Yellow Alarm Indication. 32 Transmiting DS1 Yellow Alarm Indication. 64 Receiving AIS failure indication. 128 Receiving LOF failure indication. 256 Receiving LOS failure indication. 512 Loopback State. 1024 Receiving a test pattern. 2048 Other failures. 4096 Receiving Excessive CRC Errors. 32768 Receiving LCD failure indication.
INT ds1IdleUnassignedCells	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.13	INTEGER	read-write	This variable indicates the types of cells that should be sent in case there is no real data to send. According to the ATM Forum, Unassigned cells should be sent (octet 1-3 are 0's, octet 4 is 0000xxx0, where x is 'don't care'). According to the CCITT specifications, Idle cells should be sent (everything is '0' except for the CLP bit which is '1'). By default, unassigned cells are transmitted is case there is no data to send.
INT ds1LineTypeFraming	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.14	INTEGER	read-write	This variable indicates the way ATM cells are constructed from the DS1 stream. ds1Hcs(2) indicates that the ATM cells are constructed upon the Header Check Sequence (HCS) inside the ATM cell header. ds1Plcp(3) indicates that the ATM cells are constructed from the DS1 PLCP (Physical Layer Convergence Protocol) bits.
INT ds1LineLength	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.15	INTEGER	read-write	This variable represents the length of the physical cable connected to the ds1 port. The user has to set this object to match the physical cable in order to get the netmod to receive the signal on the cable. The different values are: ds1LineLt110 (1) means the line is shorter than 110 ft, ds1Line110-220 (2) means the line length is between 110 and 220 ft, ds1Line220-330 (3) means the line length is between 220 and 330 ft, ds1Line330-440 (4) means the line length is between 330 and 440 ft, ds1Line440-550 (5) means the line length is between 440 and 550 ft, ds1Line550-660 (6) means the line length is between 550 and 660 ft, ds1LineGt655 (7) means the line is longer than 655 ft.
INT ds1RxScrambling	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.16	INTEGER	read-write	This variable indicates whether the information is being descrambled on receiving. It should be set the same as the transmitting side.
INT ds1TxScrambling	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.17	INTEGER	read-write	This variable indicates whether the information (48 octet payload) is being scrambled before transmitting. It should be set the same as the receiving side.
INT ds1TxPRBS	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.18	INTEGER	read-write	This variable controls the Pseudo-Random Bit Sequence Generator (PRSG) which generates an unframed 2^15-1 test sequence as define in Recommendation O.151. The pattern may be inverted.
I32 ds1CRCErrThrSeconds	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.19	Integer32	read-write	This variable represents the consecutive number of BAD/GOOD seconds to detect/clear an Excessive CRC Error Defect. The range of values it can take is between 2 and 10 inclusive.
I32 ds1CRCErrThrErrors	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.20	Integer32	read-write	This variable is a threshold for the number of CRC Errors per second and is used as a parameter to the Excessive CRC Error Defect. If the number of errors exceeds the threshold, the particular second is declared BAD, otherwise it is declared GOOD.
INT ds1CRCErrFailEnable	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.21	INTEGER	read-write	This variable controls whether declaration of an Excessive CRC Error Defect forces the port's operState to Down.
I32 ds1SigFailBer	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.22	Integer32	read-write	This is the exponent of 10 for the current signal fail bit error rate (BER) threshold for this port. The value -4, for example, represents a BER of 1E-4. This variable is only applicable when ds1BerErrorModel is set to errorModelRandom.
I32 ds1SigDegradeBer	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.23	Integer32	read-write	This is the exponent of 10 for the current signal degrade bit error rate (BER) threshold for this port. The value -8, for example, represents a BER of 1E-8. This variable is only applicable when ds1BerErrorModel is set to errorModelRandom.
INT ds1BerErrorModel	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.24	INTEGER	read-write	This is the error distribution model to be used to identify signal degrade and signal fail conditions. errorModelRandom selects a random error distribution and declares signal conditions based on the thresholds set in ds1SigDegradeBer and ds1SigFailBer. errorModelBurst selects a burst error model and declares signal degrade conditions based on the thresholds set in ds1CRCErrThrSeconds and ds1CRCErrThrErrors. errorModelNone disables detection of signal conditions.
INT ds1BerState	1.3.6.1.4.1.326.2.2.1.1.7.1.1.1.25	INTEGER	read-only	This value describes the current state of the port as determined through bit error rate analysis.
ds1StatsGroup	1.3.6.1.4.1.326.2.2.1.1.7.2
ds1FramingTable	1.3.6.1.4.1.326.2.2.1.1.7.2.1		not-accessible	A table of DS1 framing statistics information.
ds1FramingEntry	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1		not-accessible	A table entry containing DS1 framing statistics information.
I32 ds1FramingBoard	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.1	Integer32	read-only	The index of this port's switch board.
I32 ds1FramingModule	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.2	Integer32	read-only	The network module of this port.
I32 ds1FramingPort	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.3	Integer32	read-only	The number of this port.
C32 ds1FramingLOSsEx	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.4	Counter32	read-only	The number of seconds in which Loss Of Signal (LOS) errors have been detected.
C32 ds1FramingLCVs	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.5	Counter32	read-only	The number of Line Code Violations (LCV) that have been detected.
C32 ds1FramingFERRs	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.6	Counter32	read-only	The number of Framing ERRor (FERR) events that have been detected.
C32 ds1FramingOOFs	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.7	Counter32	read-only	The number of Out Of Frame (OOF) error events that have been detected.
C32 ds1FramingAISs	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.8	Counter32	read-only	The number of seconds in which Alarm Indication Signals (AIS) have been detected. AIS indicates that an upstream failure has been detected by the far end.
C32 ds1FramingB8ZSPatterns	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.9	Counter32	read-only	The number of seconds in which B8ZS Pattern events have been detected.
C32 ds1Framing8Zeros	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.10	Counter32	read-only	The number of seconds in which 8 Zeros events have been detected.
C32 ds1Framing16Zeros	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.11	Counter32	read-only	The number of seconds in which 16 Zeros events have been detected.
C32 ds1FramingYellowAlarms	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.12	Counter32	read-only	The number of seconds in which Yellow Alarm events have been detected.
C32 ds1FramingRedAlarms	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.13	Counter32	read-only	The number of seconds in which Red Alarm events have been detected.
C32 ds1FramingBEEs	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.14	Counter32	read-only	The number of Bit Encoding Error (BEE) events that have been detected. A Bit Error Event is defined as a CRC-6 error in ESF.
C32 ds1FramingPRBSs	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.15	Counter32	read-only	The number of seconds in which Pseudo Random Bit Sequence (PRBS) patterns have been detected.
C32 ds1FramingBERs	1.3.6.1.4.1.326.2.2.1.1.7.2.1.1.16	Counter32	read-only	The number of PRBS Bit ERror events that have been detected.
ds1PlcpTable	1.3.6.1.4.1.326.2.2.1.1.7.2.2		not-accessible	A table of DS1 Physical Layer Convergence Protocol (Procedure) statistics information.
ds1PlcpEntry	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1		not-accessible	A table entry containing DS1 PLCP statistics information.
I32 ds1PlcpBoard	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1.1	Integer32	read-only	The index of this port's switch board.
I32 ds1PlcpModule	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1.2	Integer32	read-only	The network module of this port.
I32 ds1PlcpPort	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1.3	Integer32	read-only	The number of this port.
C32 ds1PlcpBIP8s	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1.4	Counter32	read-only	Number of BIP-8 (Bit Interleaved Parity - 8) error events. The BIP-8 is calculated over the Path Overhead field and the associated ATM cell of the previous frame. A BIP-N is a method of error monitoring. An N bit code is generated by the transmitting equipment in such a manner that the first bit of the code provides even parity over the first bit of all N-bit sequences in the previous VT SPE, the second bit provides even parity over the second bits of all N-bit sequences within the specified portion, etc.
C32 ds1PlcpFERRs	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1.5	Counter32	read-only	Number of Physical Layer Convergence Protocol (PLCP) octet error events.
C32 ds1PlcpFEBEs	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1.6	Counter32	read-only	Number of ATM Far End Block Error (FEBE) events.
C32 ds1PlcpLOFs	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1.7	Counter32	read-only	The number of seconds in which Loss Of Frame (LOF) errors were detected by the PLCP (Physical Layer Convergence Protocol) receiver. LOF is declared when an Out-Of-Frame state persists for more than 1ms. LOF is removed when in-frame state persists for more than 12ms.
C32 ds1PlcpYellows	1.3.6.1.4.1.326.2.2.1.1.7.2.2.1.8	Counter32	read-only	The number of seconds in which Yellow alarm errors were detected by the PLCP (Physical Layer Convergence Protocol) receiver. Yellow alarm is asserted when 10 consecutive yellow signal bits are set to logical 1. Yellow signals are used to alert upstream terminals of a downstream failure in order to initiate trunk conditioning on the failure circuit.
ds1AtmTable	1.3.6.1.4.1.326.2.2.1.1.7.2.3		not-accessible	A table of DS1 ATM statistics information.
ds1AtmEntry	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1		not-accessible	A table entry containing DS1 ATM statistics information.
I32 ds1AtmBoard	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.1	Integer32	read-only	The index of this port's switch board.
I32 ds1AtmModule	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.2	Integer32	read-only	The network module of this port.
I32 ds1AtmPort	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.3	Integer32	read-only	The number of this port.
C32 ds1AtmHCSs	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.4	Counter32	read-only	Number of header check sequence (HCS) error events. The HCS is a CRC-8 calculation over the first 4 octets of the ATM cell header.
C32 ds1AtmRxCells	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.5	Counter32	read-only	Number of ATM cells that were received.
C32 ds1AtmTxCells	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.6	Counter32	read-only	Number of non-null ATM cells that were transmitted.
C32 ds1AtmUHCSs	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.7	Counter32	read-only	Number of uncorrectable header check sequence (UHCS) error events. The HCS is a CRC-8 calculation over the first 4 octets of the ATM cell header.
C32 ds1AtmCHCSs	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.8	Counter32	read-only	Number of correctable header check sequence (UHCS) error events. The HCS is a CRC-8 calculation over the first 4 octets of the ATM cell header.
C32 ds1AtmLCDs	1.3.6.1.4.1.326.2.2.1.1.7.2.3.1.9	Counter32	read-only	The number of seconds in which Loss of Cell Delineation (LCD) has occurred. An LCD defect is detected when an out of cell delination state has persisted for 4ms. An LCD defect is cleared when the sync state has been maintained for 4ms.

RFC description

Manages DS1 (T1/E1) port module configuration and statistics on Fore Systems ATM switches, including line coding and error monitoring.

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