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- All drawings appearing in this Recommendation have been done in Autocad.
- Recommendation Q.513
- EXCHANGE INTERFACES FOR OPERATIONS, ADMINISTRATION AND MAINTENANCE
- 1 General
- This 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).
- The field of application of this Recommendation is more fully defined in
- Recommendation Q.500.
- This 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.
- In the text of this Recommendation, references are made to operation,
- administration and maintenance (OAM) equipment which comprises either or both of
- the following:
- a) operations systems (OS) which support personnel responsible for
- exchange OAM. Note that the word exchange includes both signalling and
- switching equipment;
- b) human-machine terminals which provide access to exchanges or operations
- systems.
- 2 General characteristics of the interfaces to OAM equipment
- 2.1 Interfaces 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.)
- a) The 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.
- b) The 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.
- 2.2 An exchange may have access to one or more OAM equipment.
- 2.3 Access may be provided using separate data links, multiplexed data links,
- or one or more data networks to each OAM equipment.
- 2.4 The 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 The 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 Functional characteristics of the interface to OAM equipment
- 3.1 The exchange should not depend for its basic operation on the correct
- functioning of the OAM equipment.
- 3.2 The interface should provide basic initialization, error detection and
- automatic recovery procedures for the data link.
- 3.3 The 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 The interface should support the setting of priorities by the exchange or
- OAM equipment for the use of the transmission medium (data links).
- 3.5 The interface should support priority transfer of urgent messages.
- 4 Exchange OAM interfaces
- Exchange OAM interfaces are shown in Figure 1/Q.513.
- There are two general classes of OAM interfaces:
- a) human-machine interfaces;
- b) interfaces to OAM OSs and workstations.
- The interfaces for local and remote human-machine functions should conform
- to the MML Z.300-Series of Recommendations.
- It is planned to provide Recommendations which specify interfaces between
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- Fascicle VI.5 - Rec. Q.513 PAGE1
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- 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.
- 4.1 TMN interfaces
- 4.1.1 Q3 interface
- Interface Q3 connects exchanges to OSs via the Data Communication Network
- (DCN).
- Figure 1/Q.513 - T1108850-87
-
- The interface shall be capable of supporting the following two broad
- categories of information to be communicated:
- a) transactions: low data volumes to be transported, e.g., exchange alarm
- messages;
- b) bulk data transfers: large data volumes to be transported, e.g.,
- billing data.
- The characterization of these information types is for further study.
- The 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:
- a) X.25
- b) Signalling System No. 7 MTP/SCCP
- c) Q.921/Q.931.
- Their use in TMN applications is for further study.
- It 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.
- 4.1.2 Q2 interface
- Interface Q2 may be used to connect exchanges to Mediation Devices (MDs)
- or to Network Elements (NEs) which contain a mediation function.
- The need for the Q2 interface on an exchange is for further study.
- 4.1.3 Q1 interface
- Interface Q1 may be used to connect exchanges to NEs which support only
- the Network Element Function and no mediation function.
- The need for the Q1 interface on an exchange is for further study.
- 4.1.4 F interface
- Interface F connects exchanges to workstations. The definition of
- functions and protocols is for further study.
- 4.1.5 G interface
- Interface 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).
- This interface is specified in the Z.300-Series of Recommendations which
- may be enhanced in the future.
- 4.2 Other OAM interfaces
- These interfaces are intended to represent existing OAM interfaces during
- the period of transition to TMN. They are not subject to CCITT Recommendations.
- 4.2.1 Q0 interface
- Interface Q0 connects exchanges to OSs, MDs and NEs using protocols and
- functions other than those defined in TMN Recommendations.
- 4.2.2 F0 interface
- Interface F0 connects exchanges to workstations, using function and
- protocols not specified in TMN Recommendations.
- 4.2.3 G0 interface
- Interface G0 is a human-machine interface not subject to CCITT
- Recommendations.
- 4.3 ISDN access interfaces
- The exchange requirements for interworking between the exchange ISDN
- access sub-system including the V interfaces and the exchange TMN sub-system are
- for futher study.
- 4.4 Signalling System No. 7 network interface
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- The exchange requirements for interworking between the exchange Signalling
- System No. 7 sub-systems and the exchange TMN sub-system are for further study.
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