SIST EN 300 659-2 V1.3.1:2003

• Abstract:

  Definition of the protocol for off hook data transmission on analogue lines required to support display services such as Calling Line Identification Presentation for the PSTN.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.35 - Telephone networks
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 659-2 V1.3.1 (2001-01) - Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 2: Off-hook data transmission

SIST EN 300 659-2 V1.3.1:2003 is the Slovenian adoption of ETSI EN 300 659-2 for analogue access to the Public Switched Telephone Network (PSTN). It specifies the subscriber line protocol for off-hook data transmission over the local loop so that display services such as Calling Line Identification Presentation can work on analogue lines.

What does SIST EN 300 659-2 V1.3.1:2003 specify?

SIST EN 300 659-2 V1.3.1:2003 specifies the off-hook part of the PSTN subscriber line protocol for display and related services. It is a complement to Part 1 and contains only the differences and extensions needed when the terminal is already off-hook.

The document is organized into these main clauses:

• Scope
• References
• Definitions and abbreviations
• Data Encoding
• Protocol Requirements
• Data transmission requirements: signalling, timing and tolerance

This structure matters in practice because implementers can use Part 1 for the common behaviour and then apply the off-hook-specific rules in this part.

What are the key requirements of SIST EN 300 659-2 V1.3.1:2003?

SIST EN 300 659-2 V1.3.1:2003 defines how the local exchange and the terminal equipment coordinate off-hook data transfer, using tone signalling first and then FSK modulation if the terminal acknowledges the request. The key point is that the speech path is controlled during signalling so the data transmission does not interfere with the call.

Data encoding and protocol layers

• Clause 4 says data encoding follows EN 300 659-3. That means the message and parameter coding are taken from the companion part, not redefined here.
• Clause 5.1 and Clause 5.3 state that the presentation layer and physical layer follow EN 300 659-1. In practice, implementers reuse the on-hook framework for those layers.
• Clause 5.2 adds two data-link layer differences: the Channel Seizure Signal shall not be transmitted, and the Mark Signal shall consist of a block of 80 ± 25 mark bits. This is the part that directly changes transmitter behaviour for off-hook operation.

Off-hook signalling sequence

• Clause 6.1 requires Interface Z to support data transmission to the terminal equipment in the off-hook state. This is the network-side rule that enables display services while the line is already engaged.
• The local exchange blocks the speech path, sends the TE Alerting Signal (TAS), and waits for the TE-Acknowledgement Signal (TE-ACK). If a valid TE-ACK is recognized within the timeout, FSK modulation transmission follows; if not, the exchange restores speech and sends no data.
• If the terminal goes to quiescent state, the signalling process should be aborted. In practice, that gives the terminal a way to stop the exchange from continuing a failed attempt.

Timing and tone characteristics

• Clause 6.1.1 says TAS is a Dual Tone-Alerting Signal (DT-AS) in the off-hook case, with the same nominal frequencies, level, tone power difference and purity as in EN 300 659-1, and a duration of 80 ms ± 5 ms.
• Clause 6.1.2 defines the off-hook timing windows, including the delay before TAS, the TE-ACK recognition time, the delay before FSK starts, and the time to restore speech after transmission.
• The network-end constraint limits the combined blocking and signalling sequence to 400 ms. That matters for terminals such as videotex equipment that expect the carrier to be released quickly.

Acceptance of the acknowledgement

• Clause 6.1.3 says the local exchange shall accept DTMF "D" as a valid TE-ACK, as described in ES 201 235. This tells implementers exactly which tone the exchange must recognize as the terminal acknowledgement.

What terms does SIST EN 300 659-2 V1.3.1:2003 define?

SIST EN 300 659-2 V1.3.1:2003 uses a small set of defined terms and abbreviations that are central to the protocol.

• loop state - The line condition used in TR 101 182 for describing the local loop status.
• quiescent state - The inactive line condition used in TR 101 182; in this standard, if the terminal enters it, signalling should be aborted.
• DT-AS (off-hook) - The Dual Tone-Alerting Signal used to alert the terminal that off-hook data transmission is coming.
• SAS - Subscriber Alerting Signal, which may be sent before protocol signalling but is outside the scope of this document’s procedure.
• TAS - TE Alerting Signal, the signal used here to tell the terminal that data transmission is expected.
• TE-ACK - TE-Acknowledgement Signal, the response the exchange waits for before starting FSK modulation transmission.

Who uses SIST EN 300 659-2 V1.3.1:2003?

SIST EN 300 659-2 V1.3.1:2003 is used by PSTN network operators, local exchange equipment designers, analogue terminal manufacturers, and test laboratories. It is also relevant to quality managers and buyers who need to verify that display services work correctly on analogue lines in the off-hook state.

What changed in SIST EN 300 659-2 V1.3.1:2003 from the previous edition?

SIST EN 300 659-2 V1.3.1:2003 follows ETSI EN 300 659-2 V1.2.1, which was withdrawn after substantial technical comments in the One-step Approval Procedure. The foreword also records the approval and publication history for version 1.3.1.

Which standards are used with SIST EN 300 659-2 V1.3.1:2003?

• ETSI EN 300 659-1 - provides the on-hook transmission part, the common presentation layer requirements, the physical layer requirements, and the interface point reference used here.
• ETSI EN 300 659-3 - provides the data encoding and codings for messages and parameters.
• ETSI ES 201 235 - provides the DTMF transmitter and receiver specification, including the DTMF "D" tone accepted as TE-ACK.
• ETSI TR 101 182 - provides the definitions used for loop state and quiescent state.

What does the SIST EN 300 659-2 V1.3.1:2003 document contain?

SIST EN 300 659-2 V1.3.1:2003 contains the protocol description, timing rules, and signalling sequence for off-hook data transmission on analogue PSTN lines. It includes a timing table for off-hook events, a table for TAS physical characteristics, and network-end constraints that implementers must respect.

The document also includes two time diagrams showing a successful and an unsuccessful attempt, which help engineers understand when the speech path is blocked, when TAS is sent, when TE-ACK is expected, and when speech is restored. These figures are useful for design reviews, interoperability testing, and troubleshooting.

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Access and Terminals (AT); Analogue access to the Public Switched Telephone Network
(PSTN); Subscriber line protocol over the local loop for display (and related) services;
Part 2: Off-hook data transmission
Ta slovenski standard je istoveten z: EN 300 659-2 Version 1.3.1
ICS:
33.040.35 Telefonska omrežja Telephone networks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

European Standard (Telecommunications series)
Access and Terminals (AT);
Analogue access to the
Public Switched Telephone Network (PSTN);
Subscriber line protocol over the local loop for
display (and related) services;
Part 2: Off-hook data transmission

2 ETSI EN 300 659-2 V1.3.1 (2001-01)
Reference
REN/AT-030006-2
Keywords
data, PSTN, protocol, service
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© European Telecommunications Standards Institute 2001.
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ETSI
3 ETSI EN 300 659-2 V1.3.1 (2001-01)
Contents
Intellectual Property Rights .4
Foreword.4
1 Scope.5
2 References.5
3 Definitions and abbreviations.5
3.1 Definitions . 5
3.2 Abbreviations. 5
4 Data Encoding.6
5 Protocol Requirements.6
5.1 Presentation Layer. 6
5.2 Data-link Layer . 6
5.3 Physical Layer. 6
6 Data transmission requirements: signalling, timing and tolerance .6
6.1 Off-hook data transmission. 6
6.1.1 TAS physical characteristics. 8
6.1.2 Timing. 8
6.1.3 TE-Acknowledgement Signal. 8
History .9
ETSI
4 ETSI EN 300 659-2 V1.3.1 (2001-01)
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Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Access and
Terminals (AT).
Version 1.2.1 of the present document had been submitted to One-step Approval Procedure 200017 but was withdrawn
due to the receipt of substantial technical comments.
The present document is part 2 of a multi-part standard covering the PSTN subscriber line protocol over the local loop
for display (and related) services, as described below:
Part 1: "On-hook data transmission";
Part 2: "Off-hook data transmission";
Part 3: "Data link message and parameter codings".
National transposition dates
Date of adoption of this EN: 12 January 2001
Date of latest announcement of this EN (doa): 30 April 2001
Date of latest publication of new National Standard
...