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I — Discrimination of calls in a VPN context by means of the Network-specific facilities information element This Recommendation is intended to specify the essential features, procedures, and messages required for call control in the D-channel.
However, there are some details of procedure which have not yet been specified, and which will be the subject of further study. The transport of other message-based information flows on the D-channel is a subject for further study and will be included in related Recommendations.
The terms "data link layer" and "layer 2" are used interchangeably to refer to the layer immediately below layer 3.
They use the functions and services provided by layer 2. The unacknowledged information transfer service is used by layer 3 to provide point-to-multipoint operation as described in 5.
The layer 3 procedures request the services of layer 2 and receive information from layer 2 using the primitives defined in Recommendation Q. These primitives are used to illustrate the communication between the protocol layers and are not intended to specify or constrain implementations.
In the subclauses which follow, states are defined for circuit-switched calls in 2. This clause defines the basic call control states that individual calls may have. These definitions do not apply to the state of the interface itself, any attached equipment, the D-channel, or the logical Recommendation Q.
Because several calls may exist simultaneously at a user- network interface, and each call may be in a different state, the state of the interface itself cannot be unambiguously defined. A detailed description of the procedures for call control is given in clauses 5, 6, 7, and 8 in terms of: a the messages defined in clause 3 which are transferred across the user-network interface; and b the information processing and actions that take place at the user side and the network side.
Overview and detailed SDL diagrams for call control of circuit-switched calls are contained in Annex A. Throughout this Recommendation, references are made to B-channels. For services using H- channels, the references to B-channels should be taken to refer to the appropriate H-channel.
Further study may be needed on other enhancements to support such services. The procedures for call control are given in clause 5. Annex D contains optional procedures as an extension to the basic procedures to allow symmetric signalling.
These states are defined in Annex D. This state exists for an outgoing call when the user has received an indication that the remote user has answered the call. This state exists for an outgoing call when the network has indicated that the remote user has answered the call. The procedures for access connection control are given in clause 6. This state exists for an outgoing access connection when the user has received an indication that the local network has completed the access connection.
This state exists for an outgoing access connection when the local network has indicated that the access connection has been completed. The procedures for call control are given in 7. There is only one global call reference per interface.
Each definition includes: a A brief description of the message direction and use, including whether the message has: 1 local significance, i. For each information element, the table indicates: 1 the clause of this Recommendation describing the information element; 2 the direction in which it may be sent; i.
None of these information elements, however, are listed in any of the tables in clause 3. Recommendation X. Details on this capability explicit and implicit Type 1 user-user signalling are given in Recommendation Q. See Table When present, progress description No. NOTE 4 — Included in the event of interworking.
NOTE 5 — Included if the network provides information that can be presented to the user. NOTE 6 — The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets. NOTE 7 — Included if the network optionally provides information describing tones or alerting signals. NOTE 2 — Included in the event of interworking. NOTE 3 — Included if the network provides information that can be presented to the user. NOTE 4 — The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.
When present, progress indication No. The T reference point is the point between the customer site switching equipment NT2 and the local loop termination NT1. The pins are numbered left to right as you look at the socket with the pin at the bottom. The polarity of the transmit and receive lines indicate the polarity of the framing pulses according to the Alternate Mark Inversion AMI electrical specification.
Refer to Transmission for more information on T1 and E1 structure. The term H0 is given to a group of 6 B-channels. The D-channel is the signalling channel and is used for call setup and control and can also be used for packet switched networks like X. The overhead is the framing and synchronisation bits. This protocol is concerned only with the terminal to the local switch link. The frame format is shown below:. The switch dynamically assigns the terminal with an address between 64 and The address is used for broadcasts.
Reloading the router forces the switch to reassign a TEI. SAPI 63 is used by layer 2 management e. Just like in HDLC, the control field indicates the type of message being used. Different switch vendors have different bit interpretations hence why the switch type is important. Like Q. The fields for Q. The Call Reference Flag is 0 when the frame comes from the call originator and 1 when to the call originator.
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