Mitel Technical Specification 22

MiNET Specification
Section C - Protocol Definition
1.0 General
This section (MTS22-C) describes the message formats, types and contents for the MiNET protocol. In
addition, primitives are defined for use between MiNET and upper protocol layers.
MiNET uses the services of a suitable data link layer protocol (e.g. MiLAP or MiLAP-S). MiNET utilizes
these services using primitives defined by the data link layer protocol (see, for example, MTS21 [10]. Such
primitives are used to illustrate the communication between protocol layers and are not intended to specify
or constrain implementations.
This document will not provide detailed specifications for messages used by the older DLIC-based
terminals. For those messages, refer to § 8/PS.0 [11].
Note 1: - As stated in MTS22-B, although MiNET is not in accordance with the definitions of an OSI
layer 3 protocol, the term layer 3 will at times be used in this specification.
Note 2: - The term terminal will be used throughout this specification to refer to sets and peripherals. The
term system will be used to refer to PBX and set-handler.
2.0 Elements of layer-to-layer communication
2.1 General
Communications between layers are accomplished by the means of primitives.
Primitives represent, in an abstract way, the logical exchange of information and control between layer 3
and adjacent layers. They neither specify nor constrain implementations.
Primitives consist of commands and their respective responses associated with the services requested of a
lower layer. The general syntax of a primitive is:
XX - Generic name - Type: Parameters
where XX designates the interface across which the primitive is active.
For this MTS, the following definition for XX is used:
- DL for communication between layer 3 and the data link
layer.
Data link service definitions and primitives are defined in CCITT
Recommendation X.212 [8]. It may prove helpful to consult this
document for a better understanding of primitives.
2.1.1 Generic Names
The generic name of a primitive specifies the activity that should be performed. Table 1/MTS22-C
illustrates the primitives defined in this MTS. Note that not all primitives have associated parameters.
The primitive generic names that are defined in this MTS are described in §§ 2.1.1.1 to 2.1.1.6.
2.1.1.1 DL-ESTABLISH
The DL-ESTABLISH primitives are used to request, indicate and confirm the outcome of the procedures
for establishing multiple frame operation.
2.1.1.2 DL-RELEASE
The DL-RELEASE primitives are used to request, indicate and confirm the outcome of the procedures for
terminating a previously established multiple frame operation, or for reporting an unsuccessful
establishment attempt.
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