ATMF-CES-MIB

All MIBs › ATMF-CES-MIB

Organization: The ATM Forum

Last Updated: 1999-11-06

Category: ATM

Description: Provides ATM Forum CES MIB objects for DS1/E1 circuit emulation over ATM, covering timing and cell delay parameters.

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What Is ATMF-CES-MIB?

ATMF-CES-MIB is a vendor-neutral MIB defined per the ATM Forum's Circuit Emulation Service (CES) specification, covering emulation of DS1/E1 TDM circuits over an ATM network. It exposes performance and timing parameters for circuit emulation, most notably cell delay variation (CDV) measurements on the receive side of a DS1/E1 CES connection. As a performance-monitoring MIB it lets an operator track jitter/delay variation on the emulated circuit to detect degraded circuit-emulation quality that could cause bit errors or synchronization issues on the underlying TDM service. It directly depends on and complements the ATM Forum's broader ATM and CES specifications, and typically works alongside standard ATM interface MIBs for the underlying ATM VCs carrying the emulated circuit. It is typically deployed on ATM edge devices or circuit-emulation gateways that carry legacy TDM (DS1/E1) traffic over an ATM backbone, common in older carrier and enterprise WAN deployments. Engineers implementing or auditing this functionality typically reference the ATMF-CES-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in ATMF-CES-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

ATM circuit-emulation gateway/edge device
vendor-neutral, standards-based MIB, not tied to a specific manufacturer

Monitoring Examples

An operator would poll atmfDS1E1CESCDVRxT to measure receive-side cell delay variation on a DS1/E1 circuit-emulation connection; a rising CDV value would indicate increasing jitter in the ATM network that could degrade the quality of the emulated TDM circuit and potentially cause bit errors or slips in the DS1/E1 signal.

What Can Be Monitored

DS1/E1 circuit emulation receive cell delay variation (CDV)
circuit emulation timing/jitter quality

Imported Objects

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE
enterprises

How to Use in IPNetwork Monitor

Example using atmfDS1E1CESReassCells OID:

Select an ATM circuit-emulation gateway/edge device 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 atmfDS1E1CESReassCells 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. This count gives the number of cells played out to the DS1/E1 Service Interface. 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
atmfCESmib	1.3.6.1.4.1.353.5.2			Circuit Emulation Specification
atmfDS1E1CESmib	1.3.6.1.4.1.353.5.2.1
atmfDS1E1CESConfTable	1.3.6.1.4.1.353.5.2.1.1		not-accessible	The CES configuration table. This includes mapping channels from ATM Port to CBR interfaces. There is one atmfDS1E1CESConfEntry per CES Entity
atmfDS1E1CESConfEntry	1.3.6.1.4.1.353.5.2.1.1.1		not-accessible	An entry in the CES table. For each entry there is a corresponding entry in the stack table
I32 atmfDS1E1CESMapATMIndex	1.3.6.1.4.1.353.5.2.1.1.1.1	Integer32	read-only	The value of this object is equal to MIB II's ifIndex value of the ATM Port interface mapped through this CES to a CBR interface.
I32 atmfDS1E1CESMapVPI	1.3.6.1.4.1.353.5.2.1.1.1.2	Integer32	read-only	The value of this object is equal to the VPI used for the emulated circuit represented by this entry in the ifTable. If there is no connection, this object is meaningless and will have the value zero.
I32 atmfDS1E1CESMapVCI	1.3.6.1.4.1.353.5.2.1.1.1.3	Integer32	read-only	The value of this object is equal to the VCI used for the emulated circuit represented by this entry in the ifTable. If there is no connection, this object is meaningless and will have the value zero
INT atmfDS1E1CESCBRService	1.3.6.1.4.1.353.5.2.1.1.1.4	INTEGER	read-write	Define if DS1/E1 service as structured or not. A structured(2) interface is some nx64Kbps. An unstructured (1) interface is 1.544Mbps or 2.048Mbps. unstructured(1) passes all bits through the ATM network. strucutured(2) passes data bits through the ATM network, and may also pass signalling bits
INT atmfDS1E1CESCBRClockMode	1.3.6.1.4.1.353.5.2.1.1.1.5	INTEGER	read-write	Define if DS1/E1 service clocking mode. This maps into transmit clock source of CBR interface.
INT atmfDS1E1CESCas	1.3.6.1.4.1.353.5.2.1.1.1.6	INTEGER	read-write	This parameter selects which AAL1 Format should be used: Basic does not carry CAS bits, and uses a single 125 usec frame. E1Cas, Ds1SfCas and DS1EsfCas carry CAS bits in a multiframe structure for E1, DS1 SF and DS1 ESF respectively. This applies to structured interfaces only. Default is Basic (1).
I32 atmfDS1E1CESPartialFill	1.3.6.1.4.1.353.5.2.1.1.1.7	Integer32	read-write	If partial cell fill is used, the number of user octets per cell must be set with this parameter. Setting this parameter to zero disables partial cell fill, and causes all cells to be completely filled before they are sent.
I32 atmfDS1E1CESBufMaxSize	1.3.6.1.4.1.353.5.2.1.1.1.8	Integer32	read-write	Define maximum size in octets of the reassembly buffer. Some implementations may want allow the maximum buffer size to programmed to a size less than the physical limit to reduce the maximum delay through a circuit.
I32 atmfDS1E1CESCDVRxT	1.3.6.1.4.1.353.5.2.1.1.1.9	Integer32	read-write	UNITS `10usec'. The maximum cell arrival jitter in 10usec increments that the reassembly process will tolerate in the cell stream without producing errors in the CBR service interface
I32 atmfDS1E1CESCellLossIntegrationPeriod	1.3.6.1.4.1.353.5.2.1.1.1.10	Integer32	read-write	The time in milliseconds for the cell loss integration period. If a cells are lost for this period of time. atmfDS1E1CESCellLossStatus is set to loss (2).The mandatory definition is 2500 UNITS `msec'
atmfDS1E1CESStatsTable	1.3.6.1.4.1.353.5.2.1.2		not-accessible	The CES AAL1 statistical data table.
atmfDS1E1CESStatsEntry	1.3.6.1.4.1.353.5.2.1.2.1		not-accessible	An entry in the CES AAL1 Stats table.
C32 atmfDS1E1CESReassCellsEx	1.3.6.1.4.1.353.5.2.1.2.1.1	Counter32	read-only	This count gives the number of cells played out to the DS1/E1 Service Interface. It excludes cells that were discarded for any reason, including cells that were not used due to being declared misinserted, or discarded while the reassembler was waiting to achieve synchronization.
C32 atmfDS1E1CESHdrErrors	1.3.6.1.4.1.353.5.2.1.2.1.2	Counter32	read-only	The count of the number of AAL1 header errors detected and possibly corrected. Header errors include correctable and uncorrectable CRC, plus bad parity.
C32 atmfDS1E1CESPointerReframes	1.3.6.1.4.1.353.5.2.1.2.1.3	Counter32	read-only	This records the count of the number of events in which the AAL1 reassembler found that an SDT pointer is not where it is expected, and the pointer must be reacquired.
C32 atmfDS1E1CESLostCells	1.3.6.1.4.1.353.5.2.1.2.1.4	Counter32	read-only	Number of lost cells.
C32 atmfDS1E1CESBufUnderflows	1.3.6.1.4.1.353.5.2.1.2.1.5	Counter32	read-only	Number of buffer underflows.
C32 atmfDS1E1CESBufOverflows	1.3.6.1.4.1.353.5.2.1.2.1.6	Counter32	read-only	Number of buffer overflows.
INT atmfDS1E1CESCellLossStatus	1.3.6.1.4.1.353.5.2.1.2.1.7	INTEGER	read-only	When cells are lost for the number of milliseconds specified by atmfDS1E1CESCellLossIntegrationPeriod, the value is set to loss (2). When cells are no longer lost, the value is set to noLoss (1). An additional variable idle os added to indicate cbrct connections status of Idle.

RFC description

ATM Forum standard MIB for Circuit Emulation Service (CES) managing emulation of circuit-switched services over ATM networks.

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Download ATMF-CES-MIB