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2001-08-20
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Specification "Compliance to ITU-T
Recommendation Q.921"
6B. ISDN USER-NETWORK INTERFACE-DATA LINK
LAYER SPECIFICATION
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116107532
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2001-08-20
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FOREWORD .................................................................................................................................................................... 5
6.1 INTRODUCTION ..................................................................................................................................................... 6
6.2 FRAME STRUCTURE FOR PEER-TO-PEER COMMUNICATION .................................................................................... 6
6.2.1
General ...................................................................................................................................................... 6
6.2.2
Flag sequence ............................................................................................................................................ 6
6.2.3
Address field ............................................................................................................................................... 6
6.2.4
Control field ............................................................................................................................................... 6
6.2.5
Information field ........................................................................................................................................ 6
6.2.6
Transparency ............................................................................................................................................. 7
6.2.7
Frame check sequence (FCS) field ............................................................................................................. 7
6.2.8
Frame convention ...................................................................................................................................... 7
6.2.8.1
6.2.8.2
6.2.8.3
Numbering convention............................................................................................................................................ 7
Order of bit transmission ........................................................................................................................................ 7
Field mapping convention....................................................................................................................................... 7
6.2.9
Invalid frames ............................................................................................................................................ 7
6.2.10 Frame abort ............................................................................................................................................... 7
6.3 ELEMENTS OF PROCEDURES AND FORMATS OF FIELDS FOR DATA LINK LAYER PEER-TO-PEER COMMUNICATION ... 7
6.3.1
General ...................................................................................................................................................... 7
6.3.2
Address field format ................................................................................................................................... 8
6.3.3
Address fields variables ............................................................................................................................. 8
6.3.3.1
6.3.3.2
6.3.3.3
6.3.3.4
6.3.4
Control field format ................................................................................................................................... 9
6.3.4.1
6.3.4.2
6.3.4.3
6.3.5
Inform transfer (I) format ........................................................................................................................................ 9
Supervisory (S) format ............................................................................................................................................ 9
Unnumbered (U) format.......................................................................................................................................... 9
Control field parameters and associated state variables ........................................................................... 9
6.3.5.1
6.3.5.2
6.3.5.3
6.3.6
Address field extension bit (EA) ............................................................................................................................. 8
Command/response field bit (C/R) ......................................................................................................................... 8
Service access point identifier (SAPI) .................................................................................................................... 8
Terminal endpoint identifier (TEI).......................................................................................................................... 8
Poll/Final (P/F) bit .................................................................................................................................................. 9
Multiple frame operation - variables and sequence numbers .................................................................................. 9
Unacknowledge operation - variables and parameters .......................................................................................... 10
Frame types .............................................................................................................................................. 10
6.3.6.1
6.3.6.2
6.3.6.3
6.3.6.4
6.3.6.5
6.3.6.6
6.3.6.7
6.3.6.8
6.3.6.9
6.3.6.10
6.3.6.11
6.3.6.12
Commands and responses ..................................................................................................................................... 10
Information (I) commands .................................................................................................................................... 10
Set asynchronous balanced mode extended (SABME) command ......................................................................... 10
Disconnect (DISC) command ............................................................................................................................... 11
Unnumbered information (UI) command .............................................................................................................. 11
Received ready (RR) command/response ............................................................................................................. 11
Reject (REJ) command/response .......................................................................................................................... 11
Receive not ready (RNR) command/response....................................................................................................... 11
Unnumbered acknowledgement (UA) response .................................................................................................... 11
Disconnected mode (DM) response ................................................................................................................. 11
Frame Reject (FRMR) response ...................................................................................................................... 11
Exchange identification (XID) command/response ......................................................................................... 11
6.4 ELEMENTS FOR LAYER-TO-LAYER COMMUNICATION .......................................................................................... 12
6.4.1
General .................................................................................................................................................... 12
6.4.1.1
6.4.1.2
6.4.1.3
Generic names ....................................................................................................................................................... 12
Primitive types ...................................................................................................................................................... 14
Parameter definition .............................................................................................................................................. 14
6.4.2
Primitive procedures ................................................................................................................................ 14
6.5 DEFINITION OF THE PEER-TO-PEER PROCEDURES OF THE DATA LINK LAYER ........................................................ 15
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6.5.1
Procedure for the use of the P/F bit ......................................................................................................... 15
6.5.1.1
6.5.1.2
6.5.2
6.5.3
N(S) sequence error .............................................................................................................................................. 20
N(R) sequence error .............................................................................................................................................. 20
Timer recovery condition ...................................................................................................................................... 20
Invalid frame condition ......................................................................................................................................... 20
Frame rejection condition ..................................................................................................................................... 20
Receipt of an FRMR response frame .................................................................................................................... 20
Unsolicited response frames ................................................................................................................................. 20
Multiple assignement of a TEI value .................................................................................................................... 20
List of system parameters ......................................................................................................................... 21
6.5.9.1
6.5.9.2
6.5.9.3
6.5.9.4
6.5.9.5
6.5.9.6
6.5.9.7
6.5.9.8
6.5.9.9
6.5.10
Criteria for re-establishement ................................................................................................................................ 19
Procedures ............................................................................................................................................................ 19
Exception condition reporting and recovery ............................................................................................ 19
6.5.8.1
6.5.8.2
6.5.8.3
6.5.8.4
6.5.8.5
6.5.8.6
6.5.8.7
6.5.8.8
6.5.9
Transmitting I frames ............................................................................................................................................ 18
Receiving I frames ................................................................................................................................................ 18
Sending and receiving acknowledgements ............................................................................................................ 18
Receiving REJ frames ........................................................................................................................................... 19
Receiving RNR frames ......................................................................................................................................... 19
Data link layer own receiver busy conditions ....................................................................................................... 19
Waiting acknowledgement .................................................................................................................................... 19
Re-establishment of multiple frame operation ......................................................................................... 19
6.5.7.1
6.5.7.2
6.5.8
Establishment of multiple frame operation ........................................................................................................... 16
Information transfer .............................................................................................................................................. 17
Termination of multiple frame operation .............................................................................................................. 17
TEI-assign state ..................................................................................................................................................... 17
Collision of unnumbered commands and responses ............................................................................................. 17
Procedures for information transfer in multiple frame operation ........................................................... 18
6.5.6.1
6.5.6.2
6.5.6.3
6.5.6.4
6.5.6.5
6.5.6.6
6.5.6.7
6.5.7
General .................................................................................................................................................................. 15
TEI assignment procedure .................................................................................................................................... 15
TEI check procedure ............................................................................................................................................. 16
TEI removal procedure ......................................................................................................................................... 16
TEI identity verify procedure ................................................................................................................................ 16
Formats and codes ................................................................................................................................................ 16
Automatic negotiation of data link layer parameters ............................................................................... 16
Procedure for establishment and release of multiple frame operation .................................................... 16
6.5.5.1
6.5.5.2
6.5.5.3
6.5.5.4
6.5.5.5
6.5.6
Unacknowledged information transfer .................................................................................................................. 15
Acknowledgeed multiple frame information transfer ............................................................................................ 15
Procedures for unknowledged information transfer ................................................................................ 15
Terminal endpoint (TEI) management procedures .................................................................................. 15
6.5.3.1
6.5.3.2
6.5.3.3
6.5.3.4
6.5.3.5
6.5.3.6
6.5.4
6.5.5
Tillhör/File
Timer T200 ........................................................................................................................................................... 21
Maximum number of re-transmission (N200) ....................................................................................................... 21
Maximum number of octets in an information field (N201) ................................................................................. 21
Maximum number of transmissions of the TEI Identity request message (N202) ................................................ 21
Maximum number of outstanding I frames (k) ..................................................................................................... 21
Timer T201 ........................................................................................................................................................... 21
Timer T202 ........................................................................................................................................................... 21
Timer T203 ........................................................................................................................................................... 22
Additional parameters for Telia Datapak X.25 Bastjänst ISDN D and Telia POS ISDN (non-ITU-T) ................ 22
Data link monitor functions ..................................................................................................................... 22
6.5.10.1
6.5.10.2
6.5.10.3
Annex A
Annex B
Annex C
Annex D
Telia Nättjänster
General ............................................................................................................................................................ 22
Data link layer supervision in the multiple-frame-established state................................................................. 22
Connection verification procedures ................................................................................................................. 22
Provision of point-to-point signalling connections ......................................................................................... 23
SDL for point-to-point procedures .................................................................................................................. 23
SDL representation of the broadcast procedures ............................................................................................. 23
State transition table of the point-to-point procedures of the data link layer ................................................... 23
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2001-08-20
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Appendix I
Retransmission of REJ response frames ..................................................................................................... 23
I.1
Introduction ................................................................................................................................................................ 23
I.2
Procedure ................................................................................................................................................................... 23
I2.1 Recovery state variable V(M) .................................................................................................................................... 23
I2.2 N(S) sequence error supplementary procedure........................................................................................................... 24
Appendix II
Occurrence of MDL-ERROR-INDICATION within the basic states and actions to be taken by the
management entity ................................................................................................................................................................ 24
Appendix III Optional basic access deactivation procedure ................................................................................................. 24
Appendix IV Automatic negotiation of data link layer parameters ....................................................................................... 24
REVISION HISTORY ................................................................................................................................................ 25
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Foreword
This document contains the compliance of Telia X.25 ISDN D
implementation of ITU-T Recommendation Q.921 in terms of
interworking with ISDN and X.31 access.
The access service is based on ITU-T Q.921 Recommendation (1993),
Nortel software release generic G.36.04 and Ericsson AXE software
Telia-release Local 7.
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6.1
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Introduction
Implemented as specified.
6.2
Frame structure for peer-to-peer communication
6.2.1
General
Implemented as specified.
6.2.2
Flag sequence
Implemented as specified.
6.2.3
Address field
Implemented as specified with the following interpretation:
Each terminal on the user D channel is preassigned a terminal endpoint
identifier (TEI) at subscription time. Each terminal is also assigned a
logical terminal ID (LTID) which specified in both ET and PH service
data at service provisioning time.
The ET performs a translation (SAPI/TEI) to/from (SAPI, LTID) for
each received from the TE, or from the PH before relaying it to the PH,
or the TE when SAPI=16. The number of terminals supported reqires the
address field to be extende to 4 bytes long, where LTID is the 14-bit or
21-bit field logical terminal identified, depending on how the
L2_addressing format is chosen.
6.2.4
Control field
Implemented as specified with the following interpretation:
See comment above.
6.2.5
Information field
Implemented as specified.
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6.2.6
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Transparency
Implemented as specified.
6.2.7
Frame check sequence (FCS) field
Implemented as specified.
6.2.8
Frame convention
6.2.8.1
Numbering convention
Implemented as specified.
6.2.8.2
Order of bit transmission
Implemented as specified.
6.2.8.3
Field mapping convention
Implemented as specified.
6.2.9
Invalid frames
Implemented as specified with the following interpretation:
Not support (b) where the number of octets shown for invalid frame for
acknowledged operation should be incremented by two.
6.2.10
Frame abort
Implemented as specified.
6.3
Elements of procedures and formats of fields for data
link layer peer-to-peer communication
6.3.1
General
Implemented as specified.
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6.3.2
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Address field format
Implemented as specified with the following interpretation:
Tbd.
6.3.3
Address fields variables
6.3.3.1
Address field extension bit (EA)
Implemented as specified.
6.3.3.2
Command/response field bit (C/R)
Implemented as specified.
6.3.3.3
Service access point identifier (SAPI)
Implemented as specified.
SAPI = 16 is used for Packet communication conforming to X.25 Level
3 procedures.
6.3.3.4
Terminal endpoint identifier (TEI)
Implemented as specified with the following interpretation:
TEI for brocast data is not supported.
6.3.3.4.1
TEI for broadcast data link connection
Not supported.
6.3.3.4.2
TEI for point-to-point link connection
Implemented as specified with the following interpretation:
TEI Value 0-63 (Non-automatic TEI assigment user equipment) is assign
at the subscription time.
TEI Value 64-126 (Automatic TEI assignement user equipment) is not
supported.
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6.3.4
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Control field format
Implemented as specified.
6.3.4.1
Inform transfer (I) format
Implemented as specified.
6.3.4.2
Supervisory (S) format
Implemented as specified.
6.3.4.3
Unnumbered (U) format
Implemented as specified.
6.3.5
Control field parameters and associated state variables
Implemented as specified.
6.3.5.1
Poll/Final (P/F) bit
Implemented as specified.
6.3.5.2
Multiple frame operation - variables and sequence
numbers
6.3.5.2.1
Modulus
Implemented as specified.
6.3.5.2.2
Send state variables (VS)
Implemented as specified.
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6.3.5.2.3
Tillhör/File
Acknowledge state variable V(A)
Implemented as specified.
6.3.5.2.4
Send sequence number N(S)
Implemented as specified.
6.3.5.2.5
Receive state variable v(R)
Implemented as specified.
6.3.5.2.6
Receive sequence number N(R)
Implemented as specified.
6.3.5.3
Unacknowledge operation - variables and parameters
Not supported.
6.3.6
Frame types
6.3.6.1
Commands and responses
Implemented as specified.
6.3.6.2
Information (I) commands
Implemented as specified.
6.3.6.3
Set asynchronous balanced mode extended (SABME)
command
Implemented as specified.
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6.3.6.4
Tillhör/File
Disconnect (DISC) command
Implemented as specified.
6.3.6.5
Unnumbered information (UI) command
Not supported.
6.3.6.6
Received ready (RR) command/response
Implemented as specified.
6.3.6.7
Reject (REJ) command/response
Implemented as specified.
6.3.6.8
Receive not ready (RNR) command/response
Implemented as specified.
6.3.6.9
Unnumbered acknowledgement (UA) response
Implemented as specified.
6.3.6.10
Disconnected mode (DM) response
Implemented as specified.
6.3.6.11
Frame Reject (FRMR) response
Implemented as specified.
6.3.6.12
Exchange identification (XID) command/response
Not supported.
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6.4
Elements for layer-to-layer communication
6.4.1
General
Implemented as specified with the following interpretation:
6.4.1.1
Generic names
Implemented as specified with the following interpretation:
6.4.1.1.1
DL-ESTABLISH
Implemented as specified.
6.4.1.1.2
DL-RELEASE
Implemented as specified.
6.4.1.1.3
DL-DATA
Implemented as specified.
6.4.1.1.4
DL-UNIT-DATA
Implemented as specified.
6.4.1.1.5
MDL-ASSIGN
Not supported.
6.4.1.1.6
MDL-REMOVE
Not supported.
6.4.1.1.7
MDL-ERROR
Not supported.
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6.4.1.1.8
MDL-UNIT-DATA
Not supported.
6.4.1.1.9
MDL-XID
Not supported.
6.4.1.1.10
PH-DATA
Implemented as specified.
6.4.1.1.11
PH-ACTIVATE
Implemented as specified.
6.4.1.1.12
PH-DEACTIVATE
Implemented as specified.
6.4.1.1.13
MPH-ACTIVATE
Not supported.
6.4.1.1.14
MPH-DEACTIVATE
Not supported.
6.4.1.1.15
MPH-INFORMATION
Not supported.
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6.4.1.2
Primitive types
6.4.1.2.1
REQUEST
Implemented as specified.
6.4.1.2.2
INDICATION
Implemented as specified.
6.4.1.2.3
RESPONSE
Implemented as specified.
6.4.1.2.4
CONFIRM
Implemented as specified.
6.4.1.3
Parameter definition
6.4.1.3.1
Priority indicator
Not supported.
6.4.1.3.2
Message unit
Not supported.
6.4.2
Primitive procedures
Not supported.
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6.5
Definition of the peer-to-peer procedures of the data
link layer
6.5.1
Procedure for the use of the P/F bit
6.5.1.1
Unacknowledged information transfer
Not supported.
6.5.1.2
Acknowledgeed multiple frame information transfer
Implemented as specified.
6.5.2
Procedures for unknowledged information transfer
Not supported.
6.5.3
Terminal endpoint (TEI) management procedures
Implemented as specified with the following interpretation:
Implemented at the ET.
6.5.3.1
General
Implemented as specified.
6.5.3.2
TEI assignment procedure
Implemented as specified with the following interpretation:
Automatic TEI assignment is not supported.
6.5.3.2.1
Expiry of timer T202
Not supported.
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6.5.3.3
Tillhör/File
TEI check procedure
Not supported.
6.5.3.4
TEI removal procedure
Not supported.
6.5.3.5
TEI identity verify procedure
Not supported.
6.5.3.6
Formats and codes
Not supported.
6.5.4
Automatic negotiation of data link layer parameters
Not supported.
6.5.5
Procedure for establishment and release of multiple
frame operation
6.5.5.1
Establishment of multiple frame operation
Implemented as specified with the following interpretation:
Tbd.
6.5.5.1.1
General
Implemented as specified.
6.5.5.1.2
Establishment procedure
Implemented as specified.
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6.5.5.1.3
Tillhör/File
Procedure on expiry of timer T200
Implemented as specified with the following interpretation:
Implemented without MDL-ERROR-INDICATION.
6.5.5.2
Information transfer
Implemented as specified.
6.5.5.3
Termination of multiple frame operation
6.5.5.3.1
General
Implemented as specified.
6.5.5.3.2
Release procedure
Implemented as specified.
6.5.5.3.3
Procedure on expiry of timer T200
Implemented as specified with the following interpretation:
Implemented without MDL-ERROR-INDICATION.
6.5.5.4
TEI-assign state
Implemented as specified with the following interpretation:
Implemented without MDL-ERROR-INDICATION.
6.5.5.5
Collision of unnumbered commands and responses
6.5.5.5.1
Identical transmitted and received commands
Implemented as specified.
Telia Nättjänster
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18 (25)
SPECIFICATION
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Nr No.
LZBA 506 403/6B
Stefan Wärgner, TeleCom TBN
Dokumentansvarig/Godkänd Document responsible/Approved
Datum Date
Rev
NwS, Kerstin Erlandsson
2001-08-20
B
6.5.5.5.2
Tillhör/File
Different transmitted and received commands
Implemented as specified.
6.5.5.5.3
Unsolicited DM response and SABME or DISC
command
Implemented as specified.
6.5.6
Procedures for information transfer in multiple frame
operation
6.5.6.1
Transmitting I frames
Implemented as specified.
6.5.6.2
Receiving I frames
Implemented as specified.
6.5.6.2.1
P bit set to 1
Implemented as specified.
6.5.6.2.2
P bit set to 0
Implemented as specified.
6.5.6.3
Sending and receiving acknowledgements
6.5.6.3.1
Sending acknowledgements
Implemented as specified.
6.5.6.3.2
Receiving acknowledgement
Implemented as specified.
Telia Nättjänster
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Datum Date
Rev
NwS, Kerstin Erlandsson
2001-08-20
B
6.5.6.4
Tillhör/File
Receiving REJ frames
Implemented as specified.
6.5.6.5
Receiving RNR frames
Implemented as specified.
6.5.6.6
Data link layer own receiver busy conditions
Implemented as specified.
6.5.6.7
Waiting acknowledgement
Implemented as specified with the following interpretation:
Implemented without MDL-ERROR-INDICATION.
6.5.7
Re-establishment of multiple frame operation
6.5.7.1
Criteria for re-establishement
Implemented as specified.
6.5.7.2
Procedures
Implemented as specified with the following interpretation:
Implemented without MDL-ERROR-INDICATION.
6.5.8
Exception condition reporting and recovery
Implemented as specified with the following interpretation:
Implemented without MDL-ERROR-INDICATION.
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Datum Date
Rev
NwS, Kerstin Erlandsson
2001-08-20
B
6.5.8.1
Tillhör/File
N(S) sequence error
Implemented as specified.
6.5.8.2
N(R) sequence error
Implemented as specified.
6.5.8.3
Timer recovery condition
Implemented as specified.
6.5.8.4
Invalid frame condition
Implemented as specified.
6.5.8.5
Frame rejection condition
Implemented as specified with the following interpretation:
Implemented without MDL-ERROR-INDICATION.
6.5.8.6
Receipt of an FRMR response frame
Implemented as specified.
6.5.8.7
Unsolicited response frames
Not supported.
6.5.8.8
Multiple assignement of a TEI value
Not supported.
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Datum Date
Rev
NwS, Kerstin Erlandsson
2001-08-20
B
6.5.9
List of system parameters
6.5.9.1
Timer T200
Tillhör/File
Implemented as specified with the following interpretation:
T200 = 2,5 seconds
6.5.9.2
Maximum number of re-transmission (N200)
Implemented as specified withthe following interpretation:
N200 = 3
6.5.9.3
Maximum number of octets in an information field
(N201)
Implemented as specified with the following interpretation:
N201 = 260 octets
6.5.9.4
Maximum number of transmissions of the TEI Identity
request message (N202)
Not supported.
6.5.9.5
Maximum number of outstanding I frames (k)
Implemented as specified with the following interpretation:
k=3
6.5.9.6
Timer T201
Not supported.
6.5.9.7
Timer T202
Not supported.
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Stefan Wärgner, TeleCom TBN
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Datum Date
Rev
NwS, Kerstin Erlandsson
2001-08-20
B
6.5.9.8
Tillhör/File
Timer T203
Implemented as specified with the following interpretation:
T203 = 10 seconds.
6.5.9.9
Additional parameters for Telia Datapak X.25
Bastjänst ISDN D and Telia POS ISDN (non-ITU-T)
Trsp
This timer indicates the amount of time available before
the acknowledgeing frame must be initiated;
Trsp = 200 ms
6.5.10
Data link monitor functions
6.5.10.1
General
Implemented as specified.
6.5.10.2
Data link layer supervision in the multiple-frameestablished state
Implemented as specified.
6.5.10.3
Connection verification procedures
Implemented as specified.
6.5.10.3.1
Start timer T203
Implemented as specified.
6.5.10.3.2
Stop timer T203
Implemented as specified.
Telia Nättjänster
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SPECIFICATION
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Nr No.
LZBA 506 403/6B
Stefan Wärgner, TeleCom TBN
Dokumentansvarig/Godkänd Document responsible/Approved
Datum Date
Rev
NwS, Kerstin Erlandsson
2001-08-20
B
6.5.10.3.3
Tillhör/File
Expiry of timer T203
Implemented as specified.
Annex A
Provision of point-to-point signalling connections
Implemented as specified.
Annex B
SDL for point-to-point procedures
Noted.
Annex C
SDL representation of the broadcast procedures
Not supported.
Annex D
State transition table of the point-to-point procedures
of the data link layer
Noted.
Appendix I Retransmission of REJ response frames
I.1
Introduction
Noted.
I.2
Procedure
Noted.
I2.1
Recovery state variable V(M)
Not supported.
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Stefan Wärgner, TeleCom TBN
Dokumentansvarig/Godkänd Document responsible/Approved
Datum Date
Rev
NwS, Kerstin Erlandsson
2001-08-20
B
I2.2
Tillhör/File
N(S) sequence error supplementary procedure
Not supported.
Appendix II Occurrence of MDL-ERROR-INDICATION within the
basic states and actions to be taken by the management
entity
Not supported.
Appendix III Optional basic access deactivation procedure
Not supported.
Appendix IV Automatic negotiation of data link layer parameters
Not supported.
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Stefan Wärgner, TeleCom TBN
Dokumentansvarig/Godkänd Document responsible/Approved
Datum Date
Rev
NwS, Kerstin Erlandsson
2001-08-20
B
Tillhör/File
REVISION HISTORY
Telia Nättjänster
Rev. A
2000-04-26
New document.
Rev. B
2001-08-20
Updating of section 6.5.9.8.
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