NBS-PRBS-MIB

All MIBs › NBS-PRBS-MIB

Organization: NBS

Last Updated: 2010-10-12

Category: OAM, Optical Networking

Description: Controls and monitors pseudo-random bit sequence testing for optical signal quality verification on NBS equipment.

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What Is NBS-PRBS-MIB?

NBS-PRBS-MIB is a private enterprise MIB for controlling and monitoring Pseudo-Random Bit Sequence (PRBS) test pattern generation and checking, used to verify optical/digital signal quality and bit-error performance on NBS transmission equipment. It defines paired pattern and generator tables — one describing available PRBS test patterns by name/description, and another configuring which pattern is being generated on a given interface. This is fundamentally a diagnostic/test-mode MIB rather than a continuous health-monitoring one: it lets an operator verify a circuit's signal integrity by injecting a known bit pattern and checking for errors, which indirectly reveals the operational health of the transmission hardware (e.g. detecting bit errors caused by a failing optical transceiver or noisy line). It is a self-contained vendor MIB depending mainly on standard interface indexing (IF-MIB ifIndex) for associating PRBS generators/checkers with physical ports. It is typically used in field or lab testing of NBS optical/transmission gear during installation, turn-up, or troubleshooting of suspected line-quality issues, with technicians commonly loading the module into an NBS-PRBS-MIB MIB Browser view first to identify the exact generator and pattern objects available on the device.

IPNetwork Monitor allows you to monitor SNMP objects defined in NBS-PRBS-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

NBS optical/digital transmission equipment

Monitoring Examples

A technician would configure nbsPrbsGenTable/nbsPrbsGenEntry, setting nbsPrbsGenIfIndex and nbsPrbsGenPatternIndex to select a PRBS pattern (looked up via nbsPrbsPatternTable/nbsPrbsPatternName/nbsPrbsPatternDesc) to transmit on a specific interface. They would then monitor the corresponding checker side for bit errors to confirm the physical link or optical path is clean before placing it into service. nbsPrbsGenPatternCaps indicates which pattern types a given interface's hardware supports, useful when selecting a test appropriate to the transmission technology in use.

What Can Be Monitored

available PRBS test patterns
active PRBS pattern per interface
PRBS generator capabilities per interface
bit error detection during pattern test

Imported Objects

From NBS-CMMC-MIB

nbs	OBJECT-IDENTITY
nbsCmmcChassisIndex	OBJECT-TYPE
nbsCmmcPortIndex	OBJECT-TYPE
nbsCmmcPortName	OBJECT-TYPE
nbsCmmcSlotIndex	OBJECT-TYPE

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
nbsPrbsMib	1.3.6.1.4.1.629.212			Pattern checking and generation
nbsPrbsPatternGrp	1.3.6.1.4.1.629.212.1			Available bit sequences
U32 nbsPrbsPatternTableSize	1.3.6.1.4.1.629.212.1.1	Unsigned32	read-only	Number of entries in nbsPrbsPatternTable
nbsPrbsPatternTable	1.3.6.1.4.1.629.212.1.2		not-accessible	List of known PRBS patterns
nbsPrbsPatternEntry	1.3.6.1.4.1.629.212.1.2.1		not-accessible	A particular PRBS pattern
INT nbsPrbsPatternIndex	1.3.6.1.4.1.629.212.1.2.1.1	INTEGER	not-accessible	Index 1 is reserved. Indexing starts from 2.
STR nbsPrbsPatternName	1.3.6.1.4.1.629.212.1.2.1.2	DisplayString	read-only	Name of this pattern
STR nbsPrbsPatternDesc	1.3.6.1.4.1.629.212.1.2.1.3	DisplayString	read-only	Description of this pattern
nbsPrbsGenGrp	1.3.6.1.4.1.629.212.2			PRBS pattern generation status and configuration
U32 nbsPrbsGenTableSize	1.3.6.1.4.1.629.212.2.1	Unsigned32	read-only
nbsPrbsGenTable	1.3.6.1.4.1.629.212.2.2		not-accessible	List of ports that can generate a PRBS bitstream.
nbsPrbsGenEntry	1.3.6.1.4.1.629.212.2.2.1		not-accessible	An individual port's PRBS pattern generation status and configuration
NUM nbsPrbsGenIfIndex	1.3.6.1.4.1.629.212.2.2.1.1	InterfaceIndex	not-accessible	The Mib2 ifIndex of this pattern generator port.
OCT nbsPrbsGenPatternCaps	1.3.6.1.4.1.629.212.2.2.1.2	OCTET STRING	read-only	Bitmask indicating which patterns can be generated from this port. Bits 0 and 1 are reserved. Subsequent bits refer to the nbsPrbsPatternTable. Bit 2 corresponds to nbsPrbsPatternIndex 2, bit 3 to nbsPrbsPatternIndex 3, and so on. A bit is set (1) if that pattern can be generated by this port, cleared (0) otherwise. OCTET STRING bitmasks count the leftmost bit (MSB) as 0. A zero length OCTET STRING indicates that this object is not supported.
INT nbsPrbsGenPatternIndex	1.3.6.1.4.1.629.212.2.2.1.3	INTEGER	read-write	The nbsPrbsPatternIndex to utilize. When read, the value -1 indicates pattern generation is not supported. When read, the value 1 indicates there is no pattern currently selected. Values less than 2 cannot be written.
INT nbsPrbsGenDurationMax	1.3.6.1.4.1.629.212.2.2.1.4	INTEGER	read-only	The maximum length of time, in seconds, that a bitstream can be generated from this port. The value 0 indicates there is no limit on the length of time. The value -1 indicates the duration cannot be set, either because generation is not supported, or because there is no way to limit the duration. The generator will not stop without user intervention. It may also indicate there is no valid protocol currently selected, so the maximum duration cannot be calculated.
INT nbsPrbsGenDuration	1.3.6.1.4.1.629.212.2.2.1.5	INTEGER	read-write	The length of time, in seconds, to generate a bitstream. The value 0 indicates test should run until terminated manually by user. When read, the value -1 indicates setting a duration is not supported. Values less than 0 cannot be written.
INT nbsPrbsGenAction	1.3.6.1.4.1.629.212.2.2.1.6	INTEGER	read-write	Used to initiate and terminate pattern generation from this port. If pattern generation is not available from this port, Agent will report notSupported(1). Any SET attempts will be rejected. To generate a bitstream, user should SET this object to start(3). To terminate a bitstream, user should SET this object to stop(2). When read, Agent should report the value last SET. Agent may report stop(2) after a system reboot, or after it halts pattern generation because the time specified in nbsPrbsGenDuration elapsed.
INT nbsPrbsGenStatus	1.3.6.1.4.1.629.212.2.2.1.7	INTEGER	read-only	Indicates whether this port is generating a test bitstream. If notSupported(1), this port cannot generate a test bitstream. If unknown(2), this port can generate a test bitstream but cannot report the status. If idle(3), this port is currently not generating a test bitstream. If generating(4), this port currently is generating a test bitstream.
C32 nbsPrbsGenProgress	1.3.6.1.4.1.629.212.2.2.1.8	Counter32	read-only	Indicates how long, in seconds, the port has been generating a bitstream. When nbsPrbsGenStatus changes to generating(4), this.counter should be cleared to zero(0) and then increment once each second. When nbsPrbsGenStatus changes to idle(3), this.counter should be frozen at its then current value.
nbsPrbsCheckGrp	1.3.6.1.4.1.629.212.3			PRBS pattern checking status and configuration
U32 nbsPrbsCheckTableSize	1.3.6.1.4.1.629.212.3.1	Unsigned32	read-only
nbsPrbsCheckTable	1.3.6.1.4.1.629.212.3.2		not-accessible	List of ports that can check a PRBS bitstream.
nbsPrbsCheckEntry	1.3.6.1.4.1.629.212.3.2.1		not-accessible	An individual port's PRBS pattern checking status and configuration
NUM nbsPrbsCheckIfIndex	1.3.6.1.4.1.629.212.3.2.1.1	InterfaceIndex	not-accessible	The Mib2 ifIndex of this pattern checker port.
OCT nbsPrbsCheckPatternCaps	1.3.6.1.4.1.629.212.3.2.1.2	OCTET STRING	read-only	Bitmask indicating which patterns can be checked from this port. Bits 0 and 1 are reserved. Subsequent bits refer to the nbsPrbsPatternTable. Bit 2 corresponds to nbsPrbsPatternIndex 2, bit 3 to nbsPrbsPatternIndex 3, and so on. A bit is set (1) if that pattern can be generated by this port, cleared (0) otherwise. OCTET STRING bitmasks count the leftmost bit (MSB) as 0. A zero length OCTET STRING indicates that this object is not supported.
INT nbsPrbsCheckPatternIndex	1.3.6.1.4.1.629.212.3.2.1.3	INTEGER	read-write	The nbsPrbsPatternIndex to check for. When read, the value -1 indicates pattern checking is not supported. When read, the value 1 indicates there is no pattern currently selected. Values less than 2 cannot be written.
INT nbsPrbsCheckDurationMax	1.3.6.1.4.1.629.212.3.2.1.4	INTEGER	read-only	The maximum length of time, in seconds, that a bitstream can be checked from this port. The value 0 indicates there is no limit on the length of time. The value -1 indicates the duration cannot be set, either because checking is not supported, or because there is no way to limit the duration. The checker will not stop without user intervention. It may also indicate there is no valid protocol currently selected, so the maximum duration cannot be calculated.
INT nbsPrbsCheckDuration	1.3.6.1.4.1.629.212.3.2.1.5	INTEGER	read-write	The length of time, in seconds, to check a bitstream. The value 0 indicates test should run until terminated manually by user. When read, the value -1 indicates setting a duration is not supported. Values less than 0 cannot be written.
INT nbsPrbsCheckAction	1.3.6.1.4.1.629.212.3.2.1.6	INTEGER	read-write	Used to initiate and terminate pattern checking from this port. If pattern checking is not available from this port, Agent will report notSupported(1). Any SET attempts will be rejected. To check a bitstream, user should SET this object to start(3). To terminate checking, user should SET this object to stop(2). When read, Agent should report the value last SET. Agent may report stop(2) after a system reboot, or after it halts pattern checking because the time specified in nbsPrbsCheckDuration elapsed.
INT nbsPrbsCheckStatus	1.3.6.1.4.1.629.212.3.2.1.7	INTEGER	read-only	Indicates whether this port is checking a bitstream. If notSupported(1), this port cannot check a test bitstream. If idle(2), this port is currently not checking a test bitstream. If syncIn(3), this port currently is checking a bitstream and is synchronized with the pattern specified in nbsPrbsCheckPatternIndex. If syncOut(4), this port currently is checking a bitstream and is out of synchronization with the pattern specified in nbsPrbsCheckPatternIndex. If error(5), this port currently is checking a bitstream and an unspecified error occured in the checker. If errOverflow(6), the Error Counter reached its maximum and checking has been suspended. To clear this condition, user should set nbsPrbsCheckAction to stop(2). If gaveUp(7), the pattern checker was unable to synchronize and aborted.
C32 nbsPrbsCheckProgress	1.3.6.1.4.1.629.212.3.2.1.8	Counter32	read-only	Indicates how long, in seconds, the port has been checking a bitstream. When nbsPrbsCheckStatus changes to idle(2), this.counter should be cleared to zero(0) and then increment once each second. When nbsPrbsCheckStatus changes to syncIn(3) or syncOut(4), this.counter should be frozen at its then current value.
C32 nbsPrbsCheckErrors	1.3.6.1.4.1.629.212.3.2.1.9	Counter32	read-only	Indicates how many errors were detected during the last pattern checking session. The Agent should clear this counter to zero(0) when nbsPrbsCheckStatus changes from idle(2). While pattern checking, Agent may increase this counter as errors occur. Once nbsPrbsCheckStatus changes to idle(2), this counter should report the final error count. If errors were detected but the count is unknown, Agent should report the number 1.
INT nbsPrbsCheckUpdateFreq	1.3.6.1.4.1.629.212.3.2.1.10	INTEGER	read-write	Indicates how frequently, in minutes, the nbsPrbsTrapCheckerStatusUpdate Notification should be sent. The value zero (0) disables update Notifications.
nbsPrbsTrapGrp	1.3.6.1.4.1.629.212.200			Objects used as varbinds in traps
nbsPrbsTraps0	1.3.6.1.4.1.629.212.200.0			PRBS event notifications
NTF nbsPrbsTrapGeneratorStarted	1.3.6.1.4.1.629.212.200.0.10			Sent when nbsPrbsGenStatus transitions to generating(4). This Notification should be of Severity INFO.
NTF nbsPrbsTrapGeneratorStopped	1.3.6.1.4.1.629.212.200.0.11			Sent when nbsPrbsGenStatus transitions from generating(4). This Notification should be of Severity INFO.
NTF nbsPrbsTrapCheckerStarted	1.3.6.1.4.1.629.212.200.0.20			Sent when an interface begins checking for a bitstream. This Notification should be of Severity INFO.
NTF nbsPrbsTrapCheckerStopped	1.3.6.1.4.1.629.212.200.0.21			Sent when an interface stops checking for a bitstream. This Notification should be of Severity INFO.
NTF nbsPrbsTrapCheckerOverflowed	1.3.6.1.4.1.629.212.200.0.22			Sent when nbsPrbsCheckStatus transitions to errOverflow(6). This event indicates that the checker was unable to continue and is now in a suspended state which requires a user to manually stop the checker. This Notification should be of Severity ERROR.
NTF nbsPrbsTrapCheckerErrorDetected	1.3.6.1.4.1.629.212.200.0.23			Sent when nbsPrbsCheckErrors transitions from zero (0). This event indicates the first error was detected in the incoming bitstream. This Notification should be of Severity ERROR.
NTF nbsPrbsTrapCheckerStatusUpdate	1.3.6.1.4.1.629.212.200.0.24			This Notification periodically reports the status, error counts, and running time of the Checker process. This Notification should be of Severity INFO.
NTF nbsPrbsTrapCheckerSyncIn	1.3.6.1.4.1.629.212.200.0.25			Sent when a checker port synchronizes with a bitstream. This Notification should be of Severity ERROR.
NTF nbsPrbsTrapCheckerSyncOut	1.3.6.1.4.1.629.212.200.0.26			Sent when a checker port loses synchronization with a bitstream. This Notification should be of Severity ERROR.

RFC description

NBS vendor MIB for PRBS (Pseudo-Random Bit Sequence) pattern generation and checking on test ports.

Start monitoring NBS optical/digital transmission equipment (PRBS pattern test) 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 NBS-PRBS-MIB

What Is NBS-PRBS-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description