Fore-J2-MIB

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Organization: FORE

Last Updated: 1999-11-05

Category: ATM, Vendor: Fore Systems (ATM)

Description: Fore Systems J2 module MIB providing configuration and status management for the ForeRunner J2 ATM switch blade or expansion module.

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What Is Fore-J2-MIB?

Fore-J2-MIB is a vendor-specific MIB from Fore Systems, a pioneer ATM equipment vendor later acquired by Marconi, for the J2 line module, a T3/E3-class trunk interface blade used in ForeRunner ATM switches. It exposes configuration data for board/module/port identification, line framing parameters (line length, loopback configuration, transmit clock source), plus operational status and error counters for the line. It is used to monitor the hardware status of the J2 line card, including line status (up/down/alarm), loopback state, idle unassigned cell counts, and per-port error statistics, which are key indicators of physical-layer WAN link health on the ATM switch. It is a self-contained proprietary Fore Systems MIB with no notable dependency on external standard MIBs beyond the base SNMPv2 SMI conventions. It's typically deployed on legacy ForeRunner ATM switches equipped with J2 T3/E3 trunk modules in carrier or enterprise ATM backbone networks. Engineers can download the Fore-J2-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Fore-J2-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 (J2 module)

Monitoring Examples

An operator would poll j2ConfTable/j2ConfEntry (indexed by j2ConfBoard, j2ConfModule, j2ConfPort) to confirm each J2 port's line length, loopback configuration, and transmit clock source settings match the expected provisioning. j2LineStatus reveals whether the T3/E3 line is currently in an alarm or normal state, and j2IdleUnassignedCells tracks ATM cell-layer idle traffic, useful for detecting cell-level framing issues. The j2ErrorTable/j2ErrorEntry pair provides per-port error counters, so a rising error count alongside an abnormal j2LineStatus would indicate a degrading physical WAN link.

What Can Be Monitored

line status (up/down/alarm)
loopback configuration
transmit clock source
line length setting
idle unassigned cell count
per-port error counters

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 j2B8ZSCodingErrors OID:

Select a Fore Systems (later Marconi) ForeRunner ATM switch (J2 T3/E3 trunk line 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 j2B8ZSCodingErrors 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 B8ZS coding violation errors. 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
foreJ2	1.3.6.1.4.1.326.2.2.1.1.6			write something interesting here
j2ConfGroup	1.3.6.1.4.1.326.2.2.1.1.6.1
j2ConfTable	1.3.6.1.4.1.326.2.2.1.1.6.1.1		not-accessible	A table of J2 switch port configuration information.
j2ConfEntry	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1		not-accessible	A table entry containing J2 configuration information for each port.
I32 j2ConfBoard	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1.1	Integer32	read-only	The index of this port's switch board.
I32 j2ConfModule	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1.2	Integer32	read-only	The network module of this port.
I32 j2ConfPort	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1.3	Integer32	read-only	The number of this port.
INT j2LineLength	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1.4	INTEGER	read-write	This variable represents the length of the physical medium connected to the J2 interface: j2ShortLine (1) means the line is a short line with less than 4db of attenuation from the transmitting source. j2LongLine (2) means the line is a long line, with greater than 4db of attenuation from the transmitting source.
INT j2LoopbackConfig	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1.5	INTEGER	read-write	This variable represents the loopback configuration of the J2 interface. j2NoLoop (1) means that the interface is not in a loopback state. j2LineLoop (2) means that receive signal is looped back for retransmission without passing through the port's reframing function. j2DiagLoop (3) means that the transmit data stream is looped back to the receiver. j2OtherLoop (4) means that the interface is in a loopback that is not defined here.
INT j2TxClockSource	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1.6	INTEGER	read-write	The source of the transmit clock.
INT j2LineStatus	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1.7	INTEGER	read-only	This variable indicates the Line Status of the interface. The variable contains loopback state information and failure state information. It is a bit map represented as a sum. The j2NoAlarm should be set if and only if no other flag is set. The various bit positions are: 1 j2NoAlarm 2 j2RxLOF Receive Loss of Frame 4 j2RxLOC Receive Loss of Clock (Not used anymore) 8 j2RxAIS Receive Alarm Indication Signal 16 j2TxLOC Transmit Loss of Clock (Not used anymore) 32 j2RxRAIS Receive Remote Alarm Indication Signal 64 j2RxLOS Receive Loss of Signal 128 j2TxRAIS Transmit Yellow ( Remote Alarm Indication Signal) 256 j2Other any line status not defined here 32768 j2RxLCD Receiving LCD failure indication.
INT j2IdleUnassignedCells	1.3.6.1.4.1.326.2.2.1.1.6.1.1.1.8	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 in case there is no data to send.
j2StatsGroup	1.3.6.1.4.1.326.2.2.1.1.6.2
j2ErrorTable	1.3.6.1.4.1.326.2.2.1.1.6.2.1		not-accessible	A table of J2 error counters.
j2ErrorEntry	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1		not-accessible	A table entry containing J2 error counters.
I32 j2ErrorBoard	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.1	Integer32	read-only	The index of this port's switch board.
I32 j2ErrorModule	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.2	Integer32	read-only	The network module of this port.
I32 j2ErrorPort	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.3	Integer32	read-only	The number of this port.
C32 j2B8ZSCodingErrorsEx	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.4	Counter32	read-only	The number of B8ZS coding violation errors.
C32 j2CRC5Errors	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.5	Counter32	read-only	The number of CRC-5 received errors.
C32 j2FramingErrors	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.6	Counter32	read-only	The number of framing patterns received in error.
C32 j2RxLossOfFrame	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.7	Counter32	read-only	The number of seconds during which the receiver was experiencing Loss Of Frame.
C32 j2RxLossOfClock	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.8	Counter32	read-only	The number of seconds during which the receiver was not observing transitions on the received clock signal.
C32 j2RxAIS	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.9	Counter32	read-only	The number of seconds during which the receiver detected an Alarm Indication Signal.
C32 j2TxLossOfClock	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.10	Counter32	read-only	The number of seconds during which the transmitter was experiencing Loss Of Clock.
C32 j2RxRemoteAIS	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.11	Counter32	read-only	The number of seconds during which the receiver observed the Alarm Indication Signal in the m-bits channel.
C32 j2RxLossOfSignal	1.3.6.1.4.1.326.2.2.1.1.6.2.1.1.12	Counter32	read-only	The number of seconds during which the transmitter was experien cing Loss Of Signal.
j2AtmTable	1.3.6.1.4.1.326.2.2.1.1.6.2.2		not-accessible	A table of J2 ATM statistics information.
j2AtmEntry	1.3.6.1.4.1.326.2.2.1.1.6.2.2.1		not-accessible	A table entry containing J2 ATM statistics information.
I32 j2AtmBoard	1.3.6.1.4.1.326.2.2.1.1.6.2.2.1.1	Integer32	read-only	The index of this port's switch board.
I32 j2AtmModule	1.3.6.1.4.1.326.2.2.1.1.6.2.2.1.2	Integer32	read-only	The network module of this port.
I32 j2AtmPort	1.3.6.1.4.1.326.2.2.1.1.6.2.2.1.3	Integer32	read-only	The number of this port.
C32 j2AtmHCSs	1.3.6.1.4.1.326.2.2.1.1.6.2.2.1.4	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 j2AtmRxCells	1.3.6.1.4.1.326.2.2.1.1.6.2.2.1.5	Counter32	read-only	Number of ATM cells that were received.
C32 j2AtmTxCells	1.3.6.1.4.1.326.2.2.1.1.6.2.2.1.6	Counter32	read-only	Number of non-null ATM cells that were transmitted.
C32 j2AtmLCDs	1.3.6.1.4.1.326.2.2.1.1.6.2.2.1.7	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

Configures and monitors J2 port modules on FORE Systems ATM switches including line status and timing.

Start monitoring Fore Systems (later Marconi) ForeRunner ATM switch (J2 T3/E3 trunk line module) 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.

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