Fore-DS3-MIB

All MIBs › Fore-DS3-MIB

Organization: FORE

Last Updated: 1999-11-05

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

Description: Fore Systems DS3 (T3) interface MIB providing physical layer performance and configuration objects for DS3 trunk cards in ForeRunner ATM switches.

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What Is Fore-DS3-MIB?

Fore-DS3-MIB is a Fore Systems proprietary MIB providing management for DS3 (T3, 44.736 Mbit/s) physical-layer trunk port modules installed in ForeRunner ATM switches. It exposes per-port configuration objects identifying the board/module/port location, line type, line coding, transmit/receive line codes, loopback configuration, clock source, and receive scrambling, alongside a statistics group for line-quality performance counters. Its monitoring focus is physical-layer hardware/software configuration status, confirming a DS3 trunk port is configured with the correct line type/coding and clock source, and detecting whether a loopback has been left enabled (which would silently take the trunk out of service) or whether error statistics indicate a degrading physical link. It generally parallels the structure of the IETF standard DS3/E3 MIB conventions though implemented as a Fore-specific module. It is deployed on ForeRunner ATM switches using DS3 trunk cards in carrier and enterprise ATM backbone networks. Engineers can download the Fore-DS3-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Fore-DS3-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 switches (DS3 trunk port modules)

Monitoring Examples

An admin would poll ds3ConfTable/ds3ConfEntry, indexed by ds3ConfBoard/ds3ConfModule/ds3ConfPort, to check ds3LineType, ds3LineCoding, and ds3TxClockSource against the expected provisioning for that trunk. Finding ds3LoopbackConfig set to an active loopback mode on a port expected to be in normal service would explain why that DS3 trunk is unexpectedly carrying no live traffic. The companion ds3StatsGroup performance counters would then be checked for line errors to assess physical-layer signal quality on that port.

What Can Be Monitored

DS3 line type/coding configuration
transmit/receive clock source
loopback configuration state
line error/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 ds3FramingLOSs OID:

Select a Fore Systems (later Marconi) ForeRunner ATM switch (DS3/T3 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 ds3FramingLOSs 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 were detected by the DS3 Receive Framer block. 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
foreDs3	1.3.6.1.4.1.326.2.2.1.1.3			This MIB module supports the FORE DS3 port module.
ds3ConfGroup	1.3.6.1.4.1.326.2.2.1.1.3.1
ds3ConfTable	1.3.6.1.4.1.326.2.2.1.1.3.1.1		not-accessible	A table of DS3 switch port configuration information.
ds3ConfEntry	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1		not-accessible	A table entry containing DS3 configuration information for each port. Not all RFC1407 configuration table variables are included, and some are modified.
I32 ds3ConfBoard	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.1	Integer32	read-only	The index of this port's switch board.
I32 ds3ConfModule	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.2	Integer32	read-only	The network module of this port.
I32 ds3ConfPort	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.3	Integer32	read-only	The number of this port.
INT ds3LineType	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.4	INTEGER	read-write	This variable indicates the variety of DS3 C-bit application implementing this interface. The type of interface affects the interpretation of the usage and error statistics. This variable is defined in the rfc1407 configuration table as dsx3LineType. According to rfc1407, the different values are: ds3M23 specification: ANSI T1.107-1988 ds3SYNTRAN specification: ANSI T1.107-1988 ds3CbitParity specification: ANSI T1.107a-1989 ds3CleatChannel specification: ANSI T1.102-1987.
INT ds3LineCoding	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.5	INTEGER	read-only	This variable describes the variety of Zero Code suppression used on this interface, which in turn affects a number of its characteristics. ds3B3ZS (2) refers to the use of specified pattern of normal bits and bipolar violations which are used to replaced sequences of zero bits of specified length. This variable is defined in the rfc1407 configuration table as dsx3LineCoding.
INT ds3SendCode	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.6	INTEGER	read-write	This variable indicates what type of code is being sent across the DS3/E3 interface by the device. The values mean: ds3SendNoCode sending looped or normal data ds3SendLineCode sending request for a line loopback ds3SendPayloadCode sending a request for a payload loopback (i.e. all DS1/E1 in a DS3/E3 frame) ds3SendResetCode sending a loopback deactivation request ds3SendDS1LoopCode requesting to loopback a particular DS1/E1 within a DS3/E3 frame ds3SendTestPattern sending a test pattern.
INT ds3ReceiveCode	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.7	INTEGER	read-only	This variable indicates the type of code that was received across the DS3/E3 interface. The values mean: ds3ReceiveNoCode receiving looped or normal data ds3ReceiveLineCode receiving request for a line loopback ds3ReceivePayloadCode receiving a request for a payload loopback (i.e. all DS1/E1 in a DS3/E3 frame) ds3ReceiveResetCode receiving a loopback deactivation request ds3ReceiveDS1LoopCode receiving a request to loopback a particular DS1/E1 within a DS3/E3 frame ds3ReceiveTestPattern receiving a test pattern.
INT ds3LoopbackConfig	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.8	INTEGER	read-write	This variable represents the loopback configuration of the DS3 interface. This variable is defined in the rfc1407 configuration table as dsx3LoopbackConfig, with slightly different values. ds3NoLoop (1) means that the interface is not in a loopback state. ds3CellLoop (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. ds3PayloadLoop (3) means that the receive signal is looped back for retransmission after it has passed through the port's reframing function. ds3DiagLoop (4) means that the transmit data stream is looped back to the receiver. ds3LineLoop (5) is only supported on series B and later netmods. ds3OtherLoop (6) means that the interface is in a loopback that is not defined here.
INT ds3TxClockSource	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.9	INTEGER	read-write	The source of the transmit clock.
INT ds3RxScrambling	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.10	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 ds3TxScrambling	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.11	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.
I32 ds3LineStatus	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.12	Integer32	read-only	This variable indicates the Line Status of the interface. A similar object is defined in the rfc1407 configuration table as dsx3LineStatus (the ds3RxFERF bit is not defined in rfc1407) . The variable contains loopback state information and failure state information. It is a bit map represented as a sum. The ds3NoAlarm 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 FERF. 32 Transmiting FERF. 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. 16384 Receiving IDLE failure indication. 32768 Receiving LCD failure indication.
INT ds3IdleUnassignedCells	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.13	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 ds3LineTypeFraming	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.14	INTEGER	read-write	This variable indicates the way ATM cells are constructed from the DS3 stream. ds3Hcs(1) indicates that the ATM cells are constructed upon the Header Check Sequence (HCS) inside the ATM cell header. ds3Plcp(2) indicates that the ATM cells are constructed from the DS3 PLCP (Physical Layer Convergence Protocol) bits.
INT ds3LineLength	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.15	INTEGER	read-write	This variable represents the length of the physical cable connected to the ds3 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: ds3LineLt225 (1) means the line is shorter than 225 ft, ds1LineGt225 (2) means the line length is greater than 220 ft. This value is not settable for Series A netmods and the value for these netmods is Gt225
I32 ds3PbitPErrThrSeconds	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.16	Integer32	read-write	This variable represents the consecutive number of BAD/GOOD seconds to detect/clear an Excessive P-bit Parity Error Defect. The range of values it can take is between 2 and 10 inclusive.
I32 ds3PbitPErrThrErrors	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.17	Integer32	read-write	This variable is a threshold for the number of P-bit Parity Errors per second and is used as a parameter to the Excessive P-bit Parity Error Defect. If the number of errors exceeds the threshold, the particular second is declared BAD, otherwise it is declared GOOD.
INT ds3PbitPErrFailEnable	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.18	INTEGER	read-write	This variable controls whether declaration of an Excessive P-bit Parity Error Defect forces the port's operState to Down.
I32 ds3SigFailBer	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.19	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 ds3BerErrorModel is set to errorModelRandom.
I32 ds3SigDegradeBer	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.20	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 ds3BerErrorModel is set to errorModelRandom.
INT ds3BerErrorModel	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.21	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 ds3SigDegradeBer and ds3SigFailBer. errorModelBurst selects a burst error model and declares signal degrade conditions based on the thresholds set in ds3PErrThrSeconds and ds1PErrThrErrors. errorModelNone disables detection of signal conditions.
INT ds3BerState	1.3.6.1.4.1.326.2.2.1.1.3.1.1.1.22	INTEGER	read-only	This value describes the current state of the port as determined through bit error rate analysis.
ds3StatsGroup	1.3.6.1.4.1.326.2.2.1.1.3.2
ds3FramingTable	1.3.6.1.4.1.326.2.2.1.1.3.2.1		not-accessible	A table of DS3 framing statistics information.
ds3FramingEntry	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1		not-accessible	A table entry containing DS3 framing statistics information.
I32 ds3FramingBoard	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.1	Integer32	read-only	The index of this port's switch board.
I32 ds3FramingModule	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.2	Integer32	read-only	The network module of this port.
I32 ds3FramingPort	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.3	Integer32	read-only	The number of this port.
C32 ds3FramingLOSsEx	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.4	Counter32	read-only	The number of seconds in which Loss Of Signal (LOS) errors were detected by the DS3 Receive Framer block.
C32 ds3FramingLCVs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.5	Counter32	read-only	The number of Line Code Violations (LCV) that were detected by the DS3 Receive Framer block.
C32 ds3FramingSumLCVs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.6	Counter32	read-only	The number of DS3 information blocks (85 bits) which contain one or more Line Code Violations (LCV).
C32 ds3FramingFERRs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.7	Counter32	read-only	Number of DS3 framing error (FERR) events.
C32 ds3FramingOOFs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.8	Counter32	read-only	Number of seconds DS3 Out Of Frame (OOF) error events were experienced.
C32 ds3FramingFERFs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.9	Counter32	read-only	The number of seconds in which Far End Receive Failure (FERF) state has been detected by the DS3 Receive Framer block. FERF signal alerts the upstream terminal that a failure has been detected along the downstream line.
C32 ds3FramingAISs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.10	Counter32	read-only	The number of seconds in which Alarm Indication Signals (AIS) were detected by the DS3 Receive Framer block. AIS indicates that an upstream failure has been detected by the far end.
C32 ds3FramingPbitPERRs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.11	Counter32	read-only	Number of P-bit parity error (PERR) events.
C32 ds3FramingCbitPERRs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.12	Counter32	read-only	Number of C-bit parity error (PERR) events.
C32 ds3FramingFEBEs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.13	Counter32	read-only	Number of DS3 far end block error (FEBE) events.
C32 ds3FramingIDLEs	1.3.6.1.4.1.326.2.2.1.1.3.2.1.1.14	Counter32	read-only	The number of seconds in which IDLE signal was detected by the DS3 Receive Framer block.
ds3PlcpTable	1.3.6.1.4.1.326.2.2.1.1.3.2.2		not-accessible	A table of DS3 Physical Layer Convergence Protocol (Procedure) statistics information.
ds3PlcpEntry	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1		not-accessible	A table entry containing DS3 PLCP statistics information.
I32 ds3PlcpBoard	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1.1	Integer32	read-only	The index of this port's switch board.
I32 ds3PlcpModule	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1.2	Integer32	read-only	The network module of this port.
I32 ds3PlcpPort	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1.3	Integer32	read-only	The number of this port.
C32 ds3PlcpFERRs	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1.4	Counter32	read-only	Number of Physical Layer Convergence Protocol (PLCP) octet error events.
C32 ds3PlcpLOFs	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1.5	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 ds3PlcpBIP8s	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1.6	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 ds3PlcpFEBEs	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1.7	Counter32	read-only	Number of ATM Far End Block Error (FEBE) events.
C32 ds3PlcpYellows	1.3.6.1.4.1.326.2.2.1.1.3.2.2.1.8	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.
ds3AtmTable	1.3.6.1.4.1.326.2.2.1.1.3.2.3		not-accessible	A table of DS3 ATM statistics information.
ds3AtmEntry	1.3.6.1.4.1.326.2.2.1.1.3.2.3.1		not-accessible	A table entry containing DS3 ATM statistics information.
I32 ds3AtmBoard	1.3.6.1.4.1.326.2.2.1.1.3.2.3.1.1	Integer32	read-only	The index of this port's switch board.
I32 ds3AtmModule	1.3.6.1.4.1.326.2.2.1.1.3.2.3.1.2	Integer32	read-only	The network module of this port.
I32 ds3AtmPort	1.3.6.1.4.1.326.2.2.1.1.3.2.3.1.3	Integer32	read-only	The number of this port.
C32 ds3AtmHCSs	1.3.6.1.4.1.326.2.2.1.1.3.2.3.1.4	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 ds3AtmRxCells	1.3.6.1.4.1.326.2.2.1.1.3.2.3.1.5	Counter32	read-only	Number of ATM cells that were received.
C32 ds3AtmTxCells	1.3.6.1.4.1.326.2.2.1.1.3.2.3.1.6	Counter32	read-only	Number of non-null ATM cells that were transmitted.
C32 ds3AtmLCDs	1.3.6.1.4.1.326.2.2.1.1.3.2.3.1.7	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

FORE Systems DS3 port module MIB for configuration and statistics on DS3 switch port interfaces.

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