ATMF-CES

All MIBs › ATMF-CES

Organization: ATM Forum Circuit Emulation Working Group

Last Updated: 1996-11-05

Category: ATM

Description: Manages ATM Forum Circuit Emulation Service (CES) configuration for carrying TDM traffic over ATM networks.

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What Is ATMF-CES?

ATMF-CES is an ATM Forum standards-based, vendor-neutral MIB implementing the Circuit Emulation Service Interworking Function (CES IWF) version 2.0, used to carry constant-bit-rate (CBR) TDM traffic such as T1/E1 circuits transparently over an ATM network. It exposes per-circuit configuration and operational data through the atmfCESConfTable, covering ATM addressing (VPI/VCI), CBR service type, clocking mode, channel-associated signaling (CAS), buffer sizing, and cell-delay-variation tolerances. From a monitoring standpoint it is primarily a configuration/performance MIB for the emulated circuit's health: cell-delay-variation and buffer-size settings reveal whether jitter buffering is adequately tuned, while clock-mode and CAS settings confirm the circuit is correctly synchronized and signaling is passed through as expected—faults here manifest as circuit drops or bit errors rather than classic CPU/memory alarms. It depends on the broader ATM Forum MIB framework and interoperates with standard ATM interface MIBs for the underlying physical/ATM layer. It is typically deployed on ATM edge switches or CES interworking function devices that emulate leased-line/TDM circuits across an ATM backbone, and because the MIB is standards-based rather than proprietary, ATMF-CES SNMP polling scripts can typically be reused across ATM equipment from different vendors.

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

vendor-neutral, standards-based MIB, not tied to a specific manufacturer
ATM edge switches / Circuit Emulation Interworking Function devices

Monitoring Examples

An operator would poll atmfCESConfTable/atmfCESConfEntry, checking atmfCESAtmVpi/atmfCESAtmVci to confirm the correct ATM virtual circuit mapping and atmfCESCbrClockMode to verify clock synchronization is set appropriately. Watching atmfCESCdvRxT (cell delay variation) alongside atmfCESBufMaxSize reveals whether the jitter buffer is undersized for observed network delay variation, which would manifest as choppy TDM circuit quality. atmfCESCas indicates whether channel-associated signaling is enabled, important for voice circuits riding the emulated CBR service.

What Can Be Monitored

CBR service/clock mode configuration
ATM VPI/VCI mapping
cell delay variation tolerance
channel-associated signaling (CAS) status
jitter buffer size setting
partial cell fill setting

Imported Objects

From IF-MIB

InterfaceIndex

From RFC1155-SMI

enterprises

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using atmfCESRetryTimer OID:

Select a device implementing ATMF-CES 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 atmfCESRetryTimer 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. It reports, in seconds, how long until the device next retries establishing this circuit-emulation SVC connection. 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 an INTEGER-type OID, Value bounds is the most useful condition here — trigger an alert if the timer has been counting down (non-zero) for an unusually long stretch of consecutive polls, which would suggest the SVC is repeatedly failing to connect. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
atmfCES	1.3.6.1.4.1.353.5.2.2			The MIB module used to describe the Circuit Emulation Interworking Function (Version 2.0)
C32 atmfCESAal1SeqErrors	1.3.6.1.4.1.353.5.2.2.1.3.1.5	Counter32	read-only	Number of times that the sequence number of an incoming AAL1 Type 1 SAR-PDU causes a transition from the 'sync' state to the 'out of sequence' state, as defined by ITU-T I.363.1.
atmfCESActiveSvcEntry	1.3.6.1.4.1.353.5.2.2.1.4.1		not-accessible	An entry in the CES active SVC table. There is one entry in the table corresponding to each active row in the atmfCESConfTable for which the atmfCESConnType takes the value 'activeSvc'.
INT atmfCESActiveSvcOperStatus	1.3.6.1.4.1.353.5.2.2.1.4.1.7	INTEGER	read-only	Describes the status of the active SVC. Valid values are: other - none of the types specified below establishmentInProgress - connection is not operational, but call attempts are ongoing connected - connection is currently operational retriesExhausted - retry limit has been reached and call attempts have ceased noAddressSupplied - no remote address has been configured, so no call attempts are initiated lowerLayerDown - underlying CES IWF is not operational When the row is not 'active', the value of this object is 'other'.
INT atmfCESActiveSvcRestart	1.3.6.1.4.1.353.5.2.2.1.4.1.6	INTEGER	read-write	When the value is set to 'restart' the active SVC is released if necessary and a new setup procedure is begun. As a result of this action, the atmfCESActiveSvcOperStatus object transitions to 'establishmentInProgress' (if not already in this state) and the atmfCESRetryFailures object is cleared. When the value is set to 'noop' no operation is performed. When read, the value 'noop' is returned.
atmfCESActiveSvcTable	1.3.6.1.4.1.353.5.2.2.1.4		not-accessible	The table used to manage active SVCs established across ATM networks between CES entities.
INT atmfCESAdminStatus	1.3.6.1.4.1.353.5.2.2.1.1.1.14	INTEGER	read-create	The desired administrative status of the CES interworking function. The up and down states indicate that the traffic flow is enabled or disabled respectively across the CES interworking function.
CES atmfCESAtmIndex	1.3.6.1.4.1.353.5.2.2.1.1.1.2	CESConnectionPort	read-create	The value of this object is equal to MIB II's ifIndex value of the ATM Port interface mapped through this CES IWF to a CBR interface. This value is overwritten whenever an active or passive SVC is established. The distinguished value zero indicates that no ATM interface has been specified.
NUM atmfCESAtmVci	1.3.6.1.4.1.353.5.2.2.1.1.1.4	VciInteger	read-create	The value of this object is equal to the VCI used by the ATM VCL mapped through this CES IWF to a CBR interface. This value is overwritten whenever an active or passive SVC is established. The distinguished value zero indicates that no ATM VCL has been specified.
NUM atmfCESAtmVpi	1.3.6.1.4.1.353.5.2.2.1.1.1.3	VpiInteger	read-create	The value of this object is equal to the VPI used by the ATM VCL mapped through this CES IWF to a CBR interface. This value is overwritten whenever an active or passive SVC is established. The value is not relevant if no ATM interface has been specified (i.e., atmfCESAtmIndex is set to zero).
atmfCESBasicConfigGroup	1.3.6.1.4.1.353.5.2.2.2.1.1			A collection of objects providing configuration information for generic Circuit Emulation Service IWFs.
atmfCESBasicStatsGroup	1.3.6.1.4.1.353.5.2.2.2.1.3			A collection of objects providing statistics information for generic Circuit Emulation Service IWFs.
INT atmfCESBufMaxSize	1.3.6.1.4.1.353.5.2.2.1.1.1.9	INTEGER	read-create	Define maximum size in 10 microsecond increments of the reassembly buffer. Some implementations may want allow the maximum buffer size to be programmed to a size less than the physical limit to reduce the maximum delay through a circuit.
C32 atmfCESBufOverflows	1.3.6.1.4.1.353.5.2.2.1.3.1.9	Counter32	read-only	Number of buffer overflows. This records the count of the number of times the CES reassembly buffer overflows. If the CES IWF is implemented with multiple buffers (such as a cell level buffer and a bit level buffer, then either buffer overflow will cause this count to be incremented
C32 atmfCESBufUnderflows	1.3.6.1.4.1.353.5.2.2.1.3.1.8	Counter32	read-only	Number of buffer underflows. This records the count of the number of times the CES reassembly buffer underflows. In the case of a continuous underflow caused by a loss of ATM cell flow, a single buffer underflow should be counted. If the CES IWF is implemented with multiple buffers (such as a cell level buffer and a bit level buffer), then either buffer underflow will cause this count to be incremented.
INT atmfCESCas	1.3.6.1.4.1.353.5.2.2.1.1.1.7	INTEGER	read-create	This parameter selects which AAL1 Format should be used: Basic does not carry CAS bits, and uses a single 125 usec frame. e1Cas, ds1SfCas, dS1EsfCas and j2Cas carry CAS bits in a multiframe structure for E1, DS1 SF, DS1 ESF and J2 respectively. This applies to structured interfaces only. Default is basic (1). For unstructured interfaces this value, if present, must be set to the default of basic (1).
INT atmfCESCbrClockMode	1.3.6.1.4.1.353.5.2.2.1.1.1.6	INTEGER	read-create	Define if DSx/Ex service clocking mode. This maps into transmit clock source of CBR interface. For structured modes this value, if present, must be set to synchronous(1).
NUM atmfCESCbrIndex	1.3.6.1.4.1.353.5.2.2.1.1.1.1	InterfaceIndex	not-accessible	The value of this object is equal to MIB II's ifIndex value of the CBR interface, channel, or bundle that is being cross-connected to an ATM VCL.
INT atmfCESCbrService	1.3.6.1.4.1.353.5.2.2.1.1.1.5	INTEGER	read-create	Define if DSx/Ex service isas structured or unstructurednot. A structured(2) interface is some nx64kbKbps. An unstructured (1) interface is 1.544Mbps, 2.048Mbps, 6.312Mbps, 44.736 Mbps, or 34.368 Mbps. unstructured(1) passes all bits through the ATM network. strucutured(2) passes data bits through the ATM network, and may also pass signalling bits At this time, only unstructured mode is defined for the 44.736 Mbps and 34.368 Mbps services.
INT atmfCESCdvRxT	1.3.6.1.4.1.353.5.2.2.1.1.1.10	INTEGER	read-create	The maximum cell arrival jitter in 10 usec increments that the reassembly process will tolerate in the cell stream without producing errors on the CBR service interface.
INT atmfCESCellLossIntegrationPeriod	1.3.6.1.4.1.353.5.2.2.1.1.1.11	INTEGER	read-create	The time in milliseconds for the cell loss integration period. If a cells are continuously lost for this period of time, atmfCESCellLossStatus is set to loss (2). The default definition is 2500.
INT atmfCESCellLossStatus	1.3.6.1.4.1.353.5.2.2.1.3.1.10	INTEGER	read-only	When cells are continuously lost for the number of milliseconds specified by atmfCESCellLossIntegrationPeriod, the value is set to loss (2). When cells are no longer lost, the value is set to noLoss (1).
atmfCESCompliance	1.3.6.1.4.1.353.5.2.2.2.2.1			The compliance statement for SNMP entities which support the ATM Forum Circuit Emulation Services.
atmfCESCompliances	1.3.6.1.4.1.353.5.2.2.2.2
atmfCESConfEntry	1.3.6.1.4.1.353.5.2.2.1.1.1		not-accessible	An entry in the CES configuration table. There is one entry in the table per CES entity, mapping one CBR interface, channel, or bundle to an ATM VCL. Creation of a row in this table with a non-zero atmfCESAtmIndex causes a corresponding entry in the atmVclTable of the ATM-MIB (RFC1695) to be created.
atmfCESConformance	1.3.6.1.4.1.353.5.2.2.2
ROW atmfCESConfRowStatus	1.3.6.1.4.1.353.5.2.2.1.1.1.16	RowStatus	read-create	This object is used to create new rows in this table, modify existing rows, and to delete existing rows.
atmfCESConfTable	1.3.6.1.4.1.353.5.2.2.1.1		not-accessible	The CES configuration table used to manage interworking between CBR interfaces or channels and ATM Virtual Channel Links (VCLs). The reverse mapping is shown in the atmfCESMappingTable.
INT atmfCESConnType	1.3.6.1.4.1.353.5.2.2.1.1.1.12	INTEGER	read-create	The type of ATM connectivity between associated CES IWF's. Valid values are: other - none of the types specified below pvc - supporting connectivity is a permanent virtual connection activeSvc - attempt calls whenever none established passiveSvc - accept calls
INT atmfCESFirstRetryInterval	1.3.6.1.4.1.353.5.2.2.1.4.1.2	INTEGER	read-write	The time to wait before attempting to establish the SVC after the first failed call attempt. The time to wait between subsequent call attempts may differ to implement a backoff scheme. Zero represents an infinite interval indicating no retries.
atmfCESGroups	1.3.6.1.4.1.353.5.2.2.2.1
C32 atmfCESHdrErrors	1.3.6.1.4.1.353.5.2.2.1.3.1.2	Counter32	read-only	The count of the number of AAL1 header errors detected, including those corrected. Header errors include correctable and uncorrectable CRC, plus bad parity.
INT atmfCESLastReleaseCause	1.3.6.1.4.1.353.5.2.2.1.4.1.8	INTEGER	read-only	Value of the Cause field of the Cause information element in the last RELEASE signalling message received for this active SVC. Indicates the reason for the release.
OCT atmfCESLastReleaseDiagnostics	1.3.6.1.4.1.353.5.2.2.1.4.1.9	OCTET STRING	read-only	Value of the first 8 bytes of diagnostic information from the Cause field of the Cause information element in the last RELEASE signalling message received for this active SVC.
ATM atmfCESLocalAddr	1.3.6.1.4.1.353.5.2.2.1.1.1.13	AtmAddr	read-create	The ATM address of the local CES IWF process. This address may be used by the automatic SVC establishment procedures to identify the intended recipient CES IWF of an incoming automatic SVC call request. Optionally, the MAX-ACCESS of this object may be read-only, for those implementations where it is not desired to manually configure this address.
C32 atmfCESLostCells	1.3.6.1.4.1.353.5.2.2.1.3.1.6	Counter32	read-only	Number of lost cells, as detected by the AAL1 sequence number processing, for example. This records the count of the number of cells detected as lost in the network prior to the destination CES IWF AAL1 layer processing.
NUM atmfCESMappingCbrIndex	1.3.6.1.4.1.353.5.2.2.1.2.1.1	InterfaceIndex	read-only	The value of this object is equal to MIB II's ifIndex value of the CBR interface, channel, or bundle that is being cross-connected to an ATM VCL. Examples of the ifType value for the CBR entity are ds1(18), ds3(30), ds0(81), or ds0bundle(82).
atmfCESMappingEntry	1.3.6.1.4.1.353.5.2.2.1.2.1		not-accessible	An entry in the CES mapping table. There is one entry in the table corresponding to each active row in the atmfCESConfTable for which there is a non-zero atmfCESAtmIndex.
atmfCESMappingGroup	1.3.6.1.4.1.353.5.2.2.2.1.8			A collection of objects providing information about the mapping from ATM VCLs to CBR interfaces or channels.
atmfCESMappingTable	1.3.6.1.4.1.353.5.2.2.1.2		not-accessible	The CES mapping table used to show the mapping from ATM VCLs to CBR interfaces or channels. The mapping and interworking functions are configured in the atmfCESConfTable.
atmfCESmib	1.3.6.1.4.1.353.5.2
C32 atmfCESMisinsertedCells	1.3.6.1.4.1.353.5.2.2.1.3.1.7	Counter32	read-only	Number of AAL1 sequence violations which the AAL Convergence sublayer interprets as a misinserted cell, as defined by ITU-T I.363.1.
atmfCESObjects	1.3.6.1.4.1.353.5.2.2.1
INT atmfCESOperStatus	1.3.6.1.4.1.353.5.2.2.1.1.1.15	INTEGER	read-only	The operational status of the CES interworking function. The up and down states indicate that the traffic flow is enabled or disabled respectively across the CES interworking function. The unknown state indicates that the state of the CES interworking function cannot be determined. The state will be down or unknown if the supporting CBR or ATM interfaces are down or unknown, respectively.
atmfCESOptionalConfigGroup	1.3.6.1.4.1.353.5.2.2.2.1.2			A collection of optional objects providing configuration information for generic Circuit Emulation Service IWFs.
atmfCESOptionalStatsGroup	1.3.6.1.4.1.353.5.2.2.2.1.4			A collection of optional objects providing statistics information for generic Circuit Emulation Service IWFs.
atmfCESOptionalStructStatsGroup	1.3.6.1.4.1.353.5.2.2.2.1.7			A collection of optional objects providing statistics information for Structured DS1, E1 or J2 Nx64 kbit/s Service IWFs.
atmfCESOptionalSvcConfigGroup	1.3.6.1.4.1.353.5.2.2.2.1.10			A collection of optional objects providing SVC connection establishment support configuration information for CES IWFs.
INT atmfCESPartialFill	1.3.6.1.4.1.353.5.2.2.1.1.1.8	INTEGER	read-create	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.
C32 atmfCESPointerParityErrors	1.3.6.1.4.1.353.5.2.2.1.3.1.4	Counter32	read-only	This records the count of the number of events in which the AAL1 reassembler detects a parity check failure at the point where a structured data pointer is expected. This count is only meaningful for structured CES modes, as unstructured CES modes do not use pointers. For unstructured CES modes, this count, if present, should indicate zero.
C32 atmfCESPointerReframes	1.3.6.1.4.1.353.5.2.2.1.3.1.3	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. This count is only meaningful for structured CES modes, as unstructured CES modes do not use pointers. For unstructured CES modes, this count, if present, should indicate zero.
C32 atmfCESReassCells	1.3.6.1.4.1.353.5.2.2.1.3.1.1	Counter32	read-only	This count gives the number of cells played out to the CES 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.
ATM atmfCESRemoteAddr	1.3.6.1.4.1.353.5.2.2.1.4.1.1	AtmAddr	read-write	The ATM address supporting the corresponding far end CES IWF process. If no address is supplied, no attempts to establish the active SVC are initiated.
G32 atmfCESRetryFailures	1.3.6.1.4.1.353.5.2.2.1.4.1.5	Gauge32	read-only	Indicates how many attempts to establish the connection have failed. This count is reset whenever a connection is successfully established or the active SVC is restarted.
INT atmfCESRetryLimit	1.3.6.1.4.1.353.5.2.2.1.4.1.4	INTEGER	read-write	Sets a maximum limit on how many consecutive unsuccessful call setup attempts can be made before stopping the attempt to set up the connection. If this limit is reached then management action will be required (e.g. setting atmfCESActiveSvcRestart to 'restart') to initiate a new attempt to establish the connection. A value of zero indicates no limit - the attempts will continue until successful. If this object is not present, no limit on call attempts is assumed.
INT atmfCESRetryTimerEx	1.3.6.1.4.1.353.5.2.2.1.4.1.3	INTEGER	read-only	Indicates the current value of the retry timer for this connection. When the value reaches zero an attempt will be made to establish the active SVC. When the timer is not running, the value zero shall be returned.
atmfCESStatsEntry	1.3.6.1.4.1.353.5.2.2.1.3.1		not-accessible	An entry in the CES AAL1 Stats table. There is one entry in this table corresponding to each entry in the atmfCESConfTable.
atmfCESStatsTable	1.3.6.1.4.1.353.5.2.2.1.3		not-accessible	The CES AAL1 statistical data table.
atmfCESStructConfigGroup	1.3.6.1.4.1.353.5.2.2.2.1.5			A collection of objects providing configuration information for Structured DS1, E1 or J2 Nx64 kbit/s Service IWFs.
atmfCESStructStatsGroup	1.3.6.1.4.1.353.5.2.2.2.1.6			A collection of objects providing statistics information for Structured DS1, E1 or J2 Nx64 kbit/s Service IWFs.
atmfCESSvcConfigGroup	1.3.6.1.4.1.353.5.2.2.2.1.9			A collection of objects providing SVC connection establishment support configuration information for CES IWFs.
atmForum	1.3.6.1.4.1.353
atmForumNetworkManagement	1.3.6.1.4.1.353.5

RFC description

ATM Forum DS1/E1 Circuit Emulation Specification MIB for managing ATM circuit emulation interworking function objects, mapping CBR interfaces to ATM VPI/VCI.

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