ÿWPCL ûÿ2BJ|xÐ ` ÐÐÌÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿH øÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÌÐÐ °°°è ÐÁà1ÁÑ Âx„|ü@Ž ÑÐ Å@8Ø'@8Ø'Å ÐÓÓÃÃContents of Recommendation Q.513Äă ÁàAÁƒ Áà0ÁEXCHANGE INTERFACES FOR OPERATIONS,ƒ Áà2ÁADMINISTRATION AND MAINTENANCEƒ 1.ÁHÁGeneral 2.ÁHÁGeneral characteristics of the interface to OAM equipment Ð ø Ð3.ÁHÁFunctional characteristics of the interface to OAM equipment 4.ÁHÁExchange OAM interfaces ÁàðDÁƒ ÁàðDÁƒ ÁàðDÁ*ƒ ÁàðCÁ*     * ƒ ÃÃRecommendation Q.513ÄÄ Áàð#ÁEXCHANGE INTERFACES FOR OPERATIONS, ADMINISTRATION AND MAINTENANCEƒ 1.ÁHÁÃÃGeneralÄÄ Ð 8 ÐÁHÁThis Recommendation applies to digital local, combined, transit and international exchanges for telephony in Integrated Digital Networks (IDN) and mixed (analogue/digital) networks, and also to local, combined, transit and international exchanges in an Integrated Services Digital Network (ISDN). ÁHÁThe field of application of this Recommendation is more fully defined in Recommendation Q.500. Ð Ð ÐÁHÁThis Recommendation is not intended to define any systems or equipment in or connected to, a digital exchange via these interfaces. Therefore only the interfaces characteristics are described. ÁHÁIn the text of this Recommendation, references are made to operation, administration and maintenance (OAM) equipment which comprises either or both of the following: ÁHÁa)Âh   Âoperations systems (OS) which support personnel responsible for exchange OAM. Note that the word exchange includes both signalling and switching equipment;ÆÆ ÁHÁb)Âh   Âhuman©machine terminals which provide access to exchanges or operations systems.ÆÆ 2.ÁHÁÃÃGeneral characteristics of the interfaces to OAM equipmentÄÄ 2.1ÁHÁInterfaces are provided for the transfer of information between exchanges and locations where OAM functions are performed. Items a) and b) below illustrate examples of information that may cross the interface and which may need to be catered for. (The choice of information that crosses the interface is a matter for each administration/RPOA.) ÁHÁa)Âh   ÂThe information transferred from the exchange to OAM equipment may include customer usage and charging data, exchange system status indication, system resource utilization data, system performance measurements, alarms and messages alerting operating personnel to the current state of the exchange and other data.ÆÆ ÁHÁb)Âh   ÂThe information transferred to the exchange from the OAM equipment may include commands for system initializations and configuration control, data to effect changes in system operation, commands to initiate, terminate, or otherwise modify the services provided to customers, requests for status information and other commands.ÆÆ 2.2  ÁHÁAn exchange may have access to one or more OAM equipment. 2.3  ÁHÁAccess may be provided using separate data links, multiplexed data links, or one or more data networks to each OAM equipment. 2.4  ÁHÁThe exchange shall not become unavailable due to the failure or malfunction of OAM equipment, or the failure of links between the exchange and OAM equipment. 2.5  ÁHÁThe choice between single and multiple physical links at the exchange, and the configuration of the OAM equipment is a national matter, not subject to CCITT Recommendations. 3. ÁHÁÃÃFunctional characteristics of the interface to OAM equipmentÄÄ 3.1  ÁHÁThe exchange should not depend for its basic operation on the correct functioning of the OAM equipment. 3.2  ÁHÁThe interface should provide basic initialization, error detection and automatic recovery procedures for the data link. 3.3   Á  ÁThe interface should support data transport mechanisms that may be employed by the exchange and the OAM equipment to assure the reliable transfer of particular information (e.g. charging data). 3.4  ÁHÁThe interface should support the setting of priorities by the exchange or OAM equipment for the use of the transmission medium (data links). 3.5  ÁHÁThe interface should support priority transfer of urgent messages. 4.ÁHÁÃÃExchange OAM interfacesÄÄ ÁHÁExchange OAM interfaces are shown in Figure 1/Q.513. ÁHÁThere are two general classes of OAM interfaces: ÁHÁÁ  Áa) human©machine interfaces; ÁHÁÁ  Áb) interfaces to OAM OSs and workstations. ÁHÁThe interfaces for local and remote human©machine functions should conform to the MML Z.300©Series of Recommendations. ÁHÁIt is planned to provide Recommendations which specify interfaces between exchanges and operations systems and between exchanges and workstations. Such specifications will be based on the concept of the Telecommunications Management Network (TMN). The principles and architecture of the TMN are defined in Recommendation M.30. 4.1ÁHÁÃÃTMN interfacesÄÄ 4.1.1ÁHÁÃÃQ3 interfaceÄÄ ÁHÁInterface Q3 connects exchanges to OSs via the Data CommunicationÔ w.Ô Network (DCN). ÁHÁThe interface shall be capable of supporting the following two broad categories of information to be communicated: ÁHÁa)Âh   Âtransactions: low data volumes to be transported, e.g. exchange alarm messages;ÆÆ ÁHÁb)Âh   Âbulk data transfers: large data volumes to be transported, e.g. billing data.ÆÆ ÁHÁThe characterization of these information types is for further study. ÁHÁThe protocols used across the Q3 interface will be based on the OSI model and will use OSI protocols specified by CCITT where possible. To allow for alternative DCNs, alternative lower layer protocol sets may be used, depending on the specific situation. Several protocol sets for layers 1, 2 and 3 have been used for similar data communications networks. Examples include: ÁHÁa)Âh   ÂX.25ÆÆ ÁHÁb)Âh   ÂSignalling System No. 7 MTP/SCCPÆÆ ÁHÁc)Âh   ÂQ.921/Q.931.ÆÆ ÁHÁTheir use in TMN applications is for further study. ÁHÁIt is recommended that each set of TMN application functions with similar protocol needs be supported with unique protocol selections for layers 4 through 7 as defined by the OSI Reference Model (Recommendation X.200). The nulling of service options of individual layers above layer 3 and even entire layers above layer 3 may be necessary where justifiable. WS =  Work Station OS =  Operations System DCN = Data Communication Network ÁHÁAn exchange is an example of a Network Element (NE) as defined in Recommmendation M.30. ÁàHHÁFIGURE 1/Q.513ƒ ÁàHOÁƒ ÁàH3ÁÃÃInterfaces associated with Operations, Administration andÄă ÁàH1ÁÃÃMaintenance in a digital, transit, local or combined exchangeÄă ÁàHOÁƒ 4.1.2ÁHÁÃÃQ2 interfaceÄÄ ÁHÁInterface Q2 may be used to connect exchanges to Mediation Devices (MDs) or to Network Elements (NEs) which contain a mediation function. ÁHÁThe need for the Q2 interface on an exchange is for further study. 4.1.3ÁHÁÃÃQ1 interfaceÄÄ ÁHÁInterface Q1 may be used to connect exchanges to NEs which support only the Network Element Function and no mediation function. ÁHÁThe need for the Q1 interface on an exchange is for further study. 4.1.4ÁHÁÃÃF interfaceÄÄ ÁHÁInterface F connects exchanges to workstations. The definition of functions and protocols is for further study. 4.1.5ÁHÁÃÃG interfaceÄÄ ÁHÁInterface G is the human©machine interface for OAM functions, providing output displays and text (e.g. CRT, printer, light panel) and input capabilities (e.g., keyboard). ÁHÁThis interface is specified in the Z.300©Series of Recommendations which may be enhanced in the future. 4.2ÁHÁÃÃOther OAM interfacesÄÄ ÁHÁThese interfaces are intended to represent existing OAM interfaces during the period of transition to TMN. They are not subject to CCITT Recommendations. 4.2.1ÁHÁÃÃQO interfaceÄÄ ÁHÁInterface QO connects exchanges to OSs, MDs and NEs using protocols and functions other than those defined in TMN Recommendations. 4.2.2ÁHÁÃÃFO interfaceÄÄ ÁHÁInterface FO connects exchanges to workstations, using function and protocols not specified in TMN Recommendations. 4.2.3ÁHÁÃÃGO interfacesÄÄ ÁHÁInterface GO is a human machine interface not subject to CCITT Recommendations. 4.3ÁHÁÃÃISDN access interfacesÄÄ ÁHÁThe exchange requirements for interworking between the exchange ISDNÔ w.Ô access sub©system including the V interfaces and the exchange TMN sub©system are for futher study. 4.4ÁHÁÃÃSignalling System No. 7 network interfaceÄÄ ÁHÁThe exchange requirements for interworking between the exchange Signalling System No. 7 sub©systems and the exchange TMN sub©system are for further study.