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SIST ETS 300 659-1:1998
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Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop
for display (and related) services; Part 1: On hook data transmission
Ta slovenski standard je istoveten z: ETS 300 659-1 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 659-1:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ETS 300 659-1:1998
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SIST ETS 300 659-1:1998
EUROPEAN ETS 300 659-1
TELECOMMUNICATION February 1997
STANDARD
Source: ETSI TC-SPS Reference: DE/SPS-03034-1
ICS: 33.020
Key words: PSTN, protocol, service
Public Switched Telephone Network (PSTN);
Subscriber line protocol over the local loop for
display (and related) services;
Part 1: On hook data transmission
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [email protected]
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1997. All rights reserved.
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Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.
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Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Data encoding .9
5 Protocol requirements .9
5.1 Presentation layer .9
5.2 Data Link layer .9
5.3 Physical layer.10
6 Data transmission requirements: signalling, timing and tolerance.11
6.1 Data transmission associated with ringing.11
6.1.1 Data transmission during ringing.11
6.1.2 Data transmission prior to ringing.12
6.2 Data transmission not associated with ringing.14
6.3 TAS physical characteristics.16
6.3.1 DT-AS.16
6.3.2 RP-AS .16
7 Data Link message and parameter codings .17
7.1 Data Link message and general parameter requirements .17
7.2 Data Link message types .18
7.2.1 Call Setup message .19
7.2.2 Message Waiting Indicator message .19
7.2.3 Advice of Charge message .19
7.3 Parameter types.20
7.4 Parameter coding .21
7.4.1 Date and time parameter .21
7.4.2 Calling Line Identity parameter.21
7.4.3 Called Line Identity parameter.21
7.4.4 Reason for Absence of Calling Line Identity parameter.22
7.4.5 Calling Party Name parameter.22
7.4.6 Reason for Absence of Calling Party Name parameter .22
7.4.7 Visual Indicator parameter .23
7.4.8 Complementary Calling Line Identity parameter .23
7.4.9 Call Type parameter.23
7.4.10 First Called Line Identity parameter (in case of forwarded call) .24
7.4.11 Network Message System Status parameter.24
7.4.12 Type of Forwarded Call parameter (in case of forwarded call) .24
7.4.13 Type of Calling User parameter .25
7.4.14 Redirecting Number parameter (in case of forwarded call) .25
7.4.15 Charge parameter .25
7.4.16 Extension for network operator use parameter.26
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Annex A (normative): PSTN CLIP service parameter list. 27
Annex B (normative): TE connected to the LE via a pair gain system - considerations for the Z'
interface . 28
Annex C (normative): DTMF based subscriber line protocol. 29
C.1 Introduction. 29
C.2 Line seizure phase. 29
C.3 Information transfer phase. 29
C.4 Alerting phase. 30
Annex D (informative): Parameter list per service . 31
D.1 CLIP on Ring-back-when-free-call service . 31
D.2 Message Waiting Indicator service. 31
D.3 Advice of Charge service. 31
Annex E (informative): International reference alphabet - Basic code table . 32
Annex F (informative): Reference configurations. 33
Annex G (informative): Qualification parameters. 34
G.1 Parameter type . 34
G.2 Parameter coding . 34
Annex H (informative): Bibliography . 35
History. 36
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Foreword
This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols and
Switching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS 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";
The attention of ETSI has been drawn to the Intellectual Property Rights (IPRs) listed below which are, or
may be, or may become, Essential to this ETS and, in particular, on hook data transmission associated
with ringing, network operator option: "transmission during ringing". The IPR owner has undertaken to
grant irrevocable licences, on fair, reasonable and non-discriminatory terms and conditions under these
IPRs pursuant to the ETSI interim IPR Policy. Further details pertaining to these IPRs can be obtained
directly from the IPR owner.
The present information is submitted to the best of ETSI's knowledge. Pursuant to the ETSI interim IPR
Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can thus be
given as to the existence of other IPRs, which are, or may be, or may become, Essential to this ETS.
IPRs:
USA 4,582,956
Canada 1,225,726
Belgium 0,150,181
France 0,150,181
United Kingdom 0,150,181
Japan 1,832,616
Netherlands 0,150,181
Sweden 0,150,181
Germany 3,376,377
The related International Patent Application (WHO 85/00488) designated the following countries: AT, AU,
BE, BR, CH, DE, DK, FI, FR, GB, JP, LU, NL, NO, SE and SU.
IPR owner:
AT&T: 10 Independence Blvd.
Warren, NJ 07059-6799
USA
AT&T Contact: Mr. Rich De Felice
Tel: +1 (305) 569-3926
Fax: +1 (305) 569-4773
Transposition dates
Date of adoption: 21 February 1997
Date of latest announcement of this ETS (doa): 31 May 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 November 1997
Date of withdrawal of any conflicting National Standard (dow): 30 November 1997
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1 Scope
This first part of ETS 300 659 specifies the subscriber line protocol for the support of PSTN display
services at Local Exchange (LE) in "on hook" state. The subscriber line protocol is accomplished by using
asynchronous voice-band Frequency-Shift Keying (FSK) signalling. In addition, annex C is provided in
order to allow the continuation of use in those networks that already implemented a Dual Tone
Multi-Frequency (DTMF) based subscriber line protocol.
The requirements imposed on the FSK signalling-based subscriber line protocol deal with data encoding,
data transmission requirements and the three layers of the protocol at the network side of the interface:
presentation layer, data link layer and physical layer.
The requirements imposed on the DTMF-based subscriber line protocol deal with the transfer of the
DTMF coded display information. The procedures and the encoding arrangements are specified in
annex C of this ETS.
Terminal Equipment (TE) can be connected by analogue access directly to the LE or through an Access
Network (AN). In the latter case, data transmission can be applied from the LE or from elsewhere in the
network hence a transmission path needs to exist from the LE to the TE before data transmission. It is the
network operator's responsibility to ensure transmission path establishment. Transmission path
establishment procedures are outside the scope of this ETS.
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] ETS 300 001 (1996): "Attachments to the Public Switched Telephone Network
(PSTN); General technical requirements for equipment connected to an
analogue subscriber interface in the PSTN".
[2] ETS 300 648 (1996): "Public Switched Telephone Network (PSTN); Calling Line
Identification Presentation (CLIP) supplementary service; Service description".
[3] ETR 206 (1995): "Public Switched Telephone Network (PSTN); Multifrequency
signalling system to be used for push-button telephones [CEPT
Recommendation T/CS 46-02 E (1985)]".
[4] CCITT Recommendation Q.11 (1988): "Numbering plan for the international
telephone service".
[5] CCITT Recommendation T.50 (1992): "International Reference Alphabet (IRA)
(Formerly International Alphabet No.5 or IA5) - Information technology - 7-bit
coded character set for information interchange".
[6] CCITT Recommendation V.23 (1988): "600/1200-baud modem standardized for
use in the general switched telephone network".
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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
calling line identity: See ETS 300 648 [2].
graphic character: A character that has a visual representation normally hand-written, printed or
displayed; in IRA characters 2/1 to 7/14 (see CCITT Recommendation T.50 [5]).
long silent period: Silent period between ring patterns.
loop state: Status of the TE, see ETS 300 001 [1].
mark bit: Symbol "1" (see CCITT Recommendation V.23 [6]).
"off hook": Status of LE in which a DC current drawn by a TE in loop state is sufficient to activate the LE,
see ETS 300 001 [1].
"on hook": Status of the LE in which a DC current drawn by a TE in quiescent state is insufficient to
activate the LE, see ETS 300 001 [1].
ring pattern: A ring pattern consists of one or more ringing pulses separated by short silent periods.
Ringing Pulse Alerting Signal (RP-AS): Pulse of ringing current used to alert the TE that a data
transmission will follow. Duration of RP-AS is specified in this ETS.
ringing pulse: Pulse of ringing current used for call arrival indication within a ring pattern. Ringing
attributes (current values, duration of ringing pulses, number of ringing pulses in the ring patterns,
cadence, etc.) are network specific.
short silent period: Silent period between ringing pulses in a ring pattern.
space bit: Symbol "0" (see CCITT Recommendation V.23 [6]).
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AN Access Network
AS Alerting Signal
CLIP Calling Line Identification Presentation
CLIR Calling Line Identification Restriction
DC Direct Current
DT-AS Dual Tone-Alerting Signal
DTMF Dual Tone Multi-Frequency
FSK Frequency-Shift Keying
IRA International Reference Alphabet
LE Local Exchange
PSTN Public Switched Telephone Network
RP-AS Ringing Pulse Alerting Signal
TAS TE Alerting Signal
TE Terminal Equipment
TE-ACK TE Acknowledgement Signal
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4 Data encoding
Graphic characters and the "space" character are coded according to national versions of the IRA as
specified in CCITT Recommendation T.50 [5] (see annex E).
Control characters 0/0 to 1/15 and 7/15 are not used within this protocol. Characters 8/0 to 15/15 are
reserved for network operator use.
5 Protocol requirements
5.1 Presentation layer
The Presentation layer specifies the formats and sequence of information that LE transmits to the TE
(Presentation layer message).
The Presentation layer message format is illustrated in figure 1.
TRANSMISSION DIRECTION
PARAMETER PARAMETER PARAMETER PARAMETER PARAMETER PARAMETER
TYPE LENGTH DATA TYPE LENGTH DATA
OCTET(S) OCTET(S)
Bit 0 7 8 15 16
PARAMETER 1 PARAMETER N
Figure 1: Presentation layer message format
Each parameter consists of a Parameter type, a Parameter length and Parameter octets(s).
Parameter type (1 octet): shall contain an assigned binary encoded value to identify the Parameter.
Parameter length (1 octet): shall contain the binary encoded number of Parameter octets that follow.
Parameter data octet(s): shall contain 1 or more (up to 253) octets. The value shall be either binary
encoded or encoded in accordance with CCITT Recommendation T.50 [5].
5.2 Data Link layer
The Data Link layer is responsible for providing bit error detection capability and for prepending the
Channel Seizure Signal and the Mark Signal to the Presentation layer message.
The Data Link layer message format is illustrated in figure 2.
TRANSMISSION DIRECTION
CHANNEL MARK MESSAGE MESSAGE PRESENTATION
SEIZURE SIGNAL TYPE LENGTH LAYER CHECKSUM
SIGNAL MESSAGE
Figure 2: Data Link message format
Channel Seizure Signal: shall consist of a block of 300 continuous bits of alternating "0"s and "1"s. The
first bit to be transmitted shall be a "0". The last bit to be transmitted shall be a "1". It shall start the data
transmission only in "on hook" data transmission.
Mark Signal: shall either consist of a block of 180 ± 25 mark bits or, as a network operator option, Mark
Signal may consist of 80 ± 25 mark bits.
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Message type (1 octet): shall contain an assigned binary encoded value to identify the message.
Message length (1 octet): shall contain the binary encoded number of octets of the Data Link layer
message (not including the Message type, Message length and Checksum octets). This allows a
presentation-layer message length between 3 and 255 octets.
Checksum octet (1 octet): shall contain the two's complement of the modulo 256 sum of all the octets in
the message starting from the Message type octet up to the end of the message (excluding the
Checksum itself).
The protocol does not support error correction or message retransmission. No sequence number or
acknowledgement shall be used for the data messages transmitted from the LE to the TE.
NOTE: Any incorrect Data Link message should be discarded by the TE.
5.3 Physical layer
Physical layer requirements refer to the network end of the local loop (interface point Z, see annex F).
Simplex asynchronous voiceband data transmission technique is used to transfer data to the TE. A
frequency modulator is required in the LE and a demodulator in the TE. The frequency modulator shall
meet 1 200 baud V.23 standard characteristics as specified in CCITT Recommendation V.23 [6] for the
forward data transmission channel.
The transmission levels are described in table 1.
Table 1: Transmission levels
Signal Level -13,5 dBm ± 1,5 dB (When the line is looped on an impedance equivalent to the
source impedance).
Signal Purity Total power of all extraneous signal in the band 300-3 400 Hz shall be at least
30 dB lower than the power of signal fundamental frequency, measured at the point
of application to the loop .
Source impedance Network specific.
When sending a Data Link message the following requirements shall be met:
- each data octet (i.e. Message type, Message length, each Presentation layer message octet and
Checksum) shall be enveloped by a Start bit (space) and a Stop bit (mark) in the format shown in
figure 3; in order to avoid corruption of the checksum by premature cessation of transmission, the
Stop bit following the checksum shall be followed by an additional one to ten Mark bits;
1H GFEDCB A 0
7 654321 0
2 222222 2
Stop bit (most significant) (least significant) Start bit
Figure 3
- the order of bits transmitted to line is: Start bit first, Stop bit last;
- the octets are transmitted according to the growing order of their number: octet 1 first, octet 2
second, etc.;
- the data signal shall be continuous.
FSK modulation shall be applied only during transmission of data hence it shall be immediately stopped
after the last bit of Data Link message has been transmitted.
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6 Data transmission requirements: signalling, timing and tolerance
Data transmission requirements refer to the network end of the local loop (interface point Z, see annex F).
Interface Z shall support data transmission to TE in either or both of the following modes:
- transmission is associated with ringing;
- transmission is not associated with ringing.
The data transmission mode is service-dependant.
6.1 Data transmission associated with ringing
Two methods associated with ringing are defined to transmit information to the TE:
- data transmission during ringing;
- data transmission prior to ringing.
It is a network operator option as to which method is used.
6.1.1 Data transmission during ringing
Data transmission shall occur during the first long silent period between two ring patterns (see figure 4).
The first long silent period shall be of sufficient duration for the data to be transmitted.
The initial application of ringing will provide an alert signal to the TE that data transmission is to be
expected.
If the TE goes in loop state before or during the data transmission, normal incoming call procedure shall
occur and the data transmission shall be aborted.
Timing
FSK modulation transmission shall begin not less than 500 ms, but less than 2 000 ms after the end of the
first ring pattern. The second ring pattern shall start not less than 200 ms after FSK modulation
transmission is stopped (see figure 4 and table 2). The lower limits are required to enable TE to apply and
remove appropriate impedance for data reception.
TR AN SM ISSION D IR EC TION
T5 T6
First Ring FSK modulation Second Ring
Pattern Pattern
Ringing
Pulse(s)
transmission
First Long Silent Period
Short Silent Period
Figure 4: Data transmission during ringing
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Table 2: Data transmission during ringing - timer values
500 ms ≤ T5 < 2 000 ms
T6 ≥ 200 ms
6.1.2 Data transmission prior to ringing
A TE Alerting Signal (TAS) will be used to signal to the TE that data transmission is to be expected.
Data transmission shall occur prior to normal first ring pattern, after the TAS.
The TAS shall be either:
a) a Dual Tone Alerting Signal (DT-AS); or
b) a Ringing Pulse Alerting Signal (RP-AS); or
c) a line reversal followed by a DT-AS.
It will be a network operator option as to which method is used: the same method shall be used for data
transmission not associated with ringing (see subclause 6.2).
In case c) at the beginning of the first ringing pattern, those polarity conditions which are pertinent during
ringing will apply.
If the TE goes in loop state before or during the data transmission, normal incoming call procedures shall
occur and the data transmission shall be aborted.
Timing
a) DT-AS
TAS (DT-AS) shall precede FSK modulation transmission by not less than 45 ms; DT-AS shall precede
FSK modulation transmission by not more than 500 ms. The application of ringing current shall start not
less than 200 ms and not more than 500 ms after FSK modulation transmission is stopped (see figure 5
and table 3). The lower limits are required to enable TE to apply and remove appropriate impedance for
data reception.
TRANSMISSION DIRECTION
T4
T2
FSK modulation First Ring Second Ring
TAS:
transmission Pattern Pattern
DT-AS
Figure 5: Data transmission prior to ringing - case a) DT-AS
Table 3: Data transmission prior to ringing - timer values for case a)
45 ms ≤ T4 ≤ 500 ms (note)
200 ms ≤ T2 ≤ 500 ms
NOTE: Exceptionally, during maintenance and testing operation, T4 could be up to 5 seconds. Other
situation where T4 may be greater than 500 ms are for further study.
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b) RP-AS
TAS (RP-AS) shall precede FSK modulation transmission by not less than 500 ms; RP-AS shall precede
data transmission by not more than 800 ms. The application of ringing current shall start not less than
200 ms and not more than 500 ms after FSK modulation transmission is stopped (see figure 6 and
table 4). The lower limits are required to enable TE to apply and remove appropriate impedance for data
reception.
TRANSMISSION DIRECTION
T3 T2
First Ring
TAS: FSK m odulation Second R ing
RP-AS transm ission Pattern
Pattern
Figure 6: Data transmission prior to ringing - case b) RP-AS
Table 4: Data transmission prior to ringing - timer values for case b)
500 ms ≤ T3 ≤ 800 ms
200 ms ≤ T2 ≤ 500 ms
c) Line reversal followed by DT-AS
A silent period of at least 100 ms shall immediately follow the line reversal; TAS (Line reversal followed by
DT-AS) shall precede FSK modulation transmission by not less than 45 ms; the total period between line
reversal and the start of FSK modulation transmission shall not be greater then 700 ms. The application of
ringing current shall start not less than 200 ms and not more than 500 ms after FSK modulation
transmission is stopped (see figure 7 and table 5). The lower limits are required to enable TE to apply and
remove appropriate impedance for data reception.
TRANSMISSION DIRECTION
T7
T0 T1
T2
TAS: Line reversal + DT-AS FSK m odulation First Ring Second Ring
transm ission Pattern Pattern
Figure 7: Data transmission prior to ringing - case c) line reversal + DT-AS
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Table 5: Data transmission prior to ringing - timer values for case c)
T7 ≤ 700 ms (note)
T0 ≥ 100 ms
T1 ≥ 45 ms
200 ms ≤T2 ≤ 500 ms
NOTE: Exceptionally, during maintenance and testing operation, T7 could be up to 5 seconds. Other
situations where T1 may be greater than 500 ms are for further study.
6.2 Data transmission not associated with ringing
A TAS will be used to signal to the TE that data transmission is to be expected.
Data transmission shall occur after the TAS.
The TAS shall be either:
a) a DT-AS; or
b) a RP-AS; or
c) a line reversal followed by a DT-AS.
It is a network operator option as to which method is being used; nevertheless, it shall be the same
method as used for data transmission associated with ringing (see subclause 6.1.2), in case a network
operator uses a prior to ringing method for it.
If it is necessary a network operator using option c) (line reversal followed by DT-AS) may apply option a)
(DT-AS only) to some subscribers in order to avoid unacceptable bell tinkle.
If the TE goes in loop state before or during the FSK modulation, the FSK modulation shall be aborted and
normal outgoing call procedure shall occur.
Timing
a) DT-AS
TAS (DT-AS) shall precede FSK modulation transmission by not less than 45 ms; DT-AS shall precede
FSK modulation transmission by not more than 500 ms. The LE shall re-establish the condition existing
before the TAS is sent within a minimum of 200 ms and a maximum of 500 ms after FSK modulation
transmission is stopped (see figure 8 and table 6).The lower limit is required to enable TE to apply and
remove appropriate impedance for data reception
TRANSMISSION DIRECTION
T4
T8
FSK modulation
TAS:
DT-AS transmission
Figure 8: Data transmission not associa
...