ETSI ETS 300 609-3 ed.1 (1999-01)

SLOVENSKI STANDARD
SIST ETS 300 609-3 E1:2003
01-december-2003
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Digital cellular telecommunications system (Phase 2) (GSM); Base Station System (BSS)
equipment specification; Part 3: Transcoder aspects (GSM 11.24 version 4.3.1)
Ta slovenski standard je istoveten z: ETS 300 609-3 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 609-3 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 609-3 E1:2003

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SIST ETS 300 609-3 E1:2003
EUROPEAN ETS 300 609-3
TELECOMMUNICATION January 1999
STANDARD
Source: SMG Reference: DE/SMG-081124P
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile Communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2);
Base Station System (BSS) equipment specification;
Part 3: Transcoder aspects
(GSM 11.24 version 4.3.1)
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
Internet: secretariat@etsi.fr - http://www.etsi.org
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 1999. 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 Standards Making Support Dept." at the address shown on the title page.

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Contents
Intellectual Property Rights.5
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .9
3.1 Definitions .9
3.2 Abbreviations .9
4 Transcoding and rate adaption.10
4.1 Transcoder test points .10
4.1.1 External interfaces.10
4.1.1.1 Test signals applied to the antenna connector .10
4.1.2 Internal test points and interfaces .11
5 Test descriptions for speech related transcoding function.17
5.1 Test descriptions for full rate speech related transcoding functions.17
5.1.1 Uplink tests.17
5.1.1.1 Uplink speech transcoding - 13 kbit/s to 104 kbit/s
conversion .17
5.1.1.2 Uplink speech transcoding - 13 kbit/s to 16 kbit/s
conversion .18
5.1.1.3 Uplink speech transcoding - 16 kbit/s to 104 kbit/s
conversion .18
5.1.1.4 Uplink speech transcoding - 104 kbit/s to 64 kbit/s
conversion .19
5.1.1.5 Uplink Speech Decoder - 13 kbit/s to 104 kbit/s
conversion with DTX.19
5.1.1.6 Uplink Speech Decoder - 13 kbit/s to 16 kbit/s conversion
with DTX .23
5.1.1.7 Uplink Speech Decoder - 16 kbit/s to 104 kbit/s
conversion with DTX.24
5.1.2 Downlink tests .26
5.1.2.1 Downlink speech transcoding - 64 kbit/s to 104 kbit/s
conversion .26
5.1.2.2 Downlink speech transcoding - 104 kbit/s to 13 kbit/s
conversion .26
5.1.2.3 Downlink speech transcoding - 104 kbit/s to 16 kbit/s
conversion .27
5.1.2.4 Downlink speech transcoding - 16 kbit/s to 13 kbit/s
conversion .28
5.1.2.5 Downlink transmitter DTX/VAD functions - 104 kbit/s to
13 kbit/s level conversion with DTX.28
5.1.2.6 Downlink transmitter DTX/VAD functions - 104 kbit/s to
16 kbit/s conversion process .29
5.1.2.7 Downlink transmitter DTX/VAD functions - 16 kbit/s to 13
kbit/s conversion.30
5.2 Test descriptions for half rate speech related transcoding functions.31
5.3 Test descriptions for enhanced full rate speech related transcoding functions.31
5.4 Alternative use of the 64 kbit/s A-Interface for full, half and enhanced full rate speech
transcoding tests.32

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6 Test descriptions for full rate data rate adaption functions. 32
6.1 Uplink rate adaptation data tests. 33
6.1.1 Uplink rate adaptation, transparent data: radio rate to 64 kbit/s level. 33
6.1.2 Uplink rate adaptation, transparent data - radio rate to 16kbit/s conversion 34
6.1.3 Uplink rate adaption, transparent data: 16 kbit/s to 64 kbit/s. 35
6.1.4 Uplink rate adaptation, non-transparent data: radio rates to 64 kbit/s. 36
6.1.5 Uplink rate adaptation, non-transparent data: radio rate to 16kbit/s
conversion . 37
6.1.6 Uplink rate adaption, non-transparent data: 16 kbit/s to 64 kbit/s . 38
6.2 Downlink rate adaptation data tests . 39
6.2.1 Downlink rate adaptation, transparent data : 64 kbit/s to radio rates . 39
6.2.2 Downlink rate adaptation, transparent data - 64 kbit/s to 16 kbit/s
conversion . 40
6.2.3 Downlink rate adaptation, transparent data: 16 kbit/s to radio rate . 41
6.2.4 Downlink rate adaptation, non-transparent data: 64 kbit/s to radio rates
conversion . 41
6.2.5 Downlink rate adaptation, non-transparent data - 64 kbit/s to 16 kbit/s
conversion . 42
6.2.6 Downlink rate adaptation, non-transparent data: 16 kbit/s to radio rate . 43
Annex A (informative): Change history. 45
History. 46

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Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The
information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-
members, and can be found in SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially
Essential, IPRs notified to ETSI in respect of ETSI standards", which is available free of charge from the
ETSI Secretariat. Latest updates are available on the ETSI Web server (http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.
No guarantee can be given as to the existence of other IPRs not referenced in SR 000 314 (or the
updates on the ETSI Web server) which are, or may be, or may become, essential to the present
document.
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This European Telecommunication Standard (ETS) describes the tests for transcoding functions within
the digital cellular telecommunications system (Phase 2).
The contents of this ETS is subject to continuing work within SMG and may change following formal SMG
approval. Should SMG modify the contents of this ETS, it will be resubmitted for OAP by ETSI with an
identifying change of release date and an increase in version number as follows:
Version 4.x.y
where:
4 indicates GSM Phase 2;
x the second digit is incremented for all changes of substance, i.e. technical enhancements,
corrections, updates, etc.
y the third digit is incremented when editorial only changes have been incorporated in the
specification.
Transposition dates
Date of adoption of this ETS: 22 January 1999
Date of latest announcement of this ETS (doa): 30 April 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 October 1999
Date of withdrawal of any conflicting National Standard (dow): 31 October 1999
Introduction
This ETS contains the test specifications relating to the speech and transcoding aspects of a Base Station
System (BSS). It provides a means to ensure that the BSS operates in accordance with the core
specifications defined for GSM phase 2.
This ETS is a guide for manufacturers and users of GSM equipment and provides a common basis for the
characterization of the relevant system operational aspects.

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1 Scope
This European Telecommunication Standard (ETS) specifies the testing requirements and methods for
GSM 900 and DCS 1800 Base Station Systems.
Unless otherwise specified, references to GSM also includes DCS1800.
This test specification covers the following functions in the BSS:
- definition of test points;
- speech coding/decoding;
- data rate adaption;
- speech and data transcoding with DTX;
- control of remote TRAU.
The tests in this document are based on the full set of GSM phase 2 ETSs. In cased of any inconsistency
between this specification and the source specifications, the source specifications shall prevail.
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] ETR 100 (GSM 01.04): "Digital cellular telecommunication system (Phase 2);
Abbreviations and acronyms".
[2] ETS 300 557 (GSM 04.08): "Digital cellular telecommunication system
(Phase 2); Mobile radio interface layer 3 specification".
[3] ETS 300 562 (GSM 04.21): "Digital cellular telecommunication system
(Phase 2); Rate adaption on the Mobile Station - Base Station System (MS -
BSS) interface".
[4] ETS 300 574 (GSM 05.02): "Digital cellular telecommunication system
(Phase 2); Multiplexing and multiple access on the radio path".
[5] ETS 300 575 (GSM 05.03): "Digital cellular telecommunication system
(Phase 2); Channel coding".
[6] ETS 300 578 (GSM 05.08): "Digital cellular telecommunication system
(Phase 2); Radio subsystem link control".
[7] ETS 300 580-1 (GSM 06.01): "Digital cellular telecommunication system
(Phase 2); Full rate speech processing functions".
[8] ETS 300 580-2 (GSM 06.10): "Digital cellular telecommunication system
(Phase 2); Full rate speech transcoding".
[9] ETS 300 580-3 (GSM 06.11): "Digital cellular telecommunication system
(Phase 2); Substitution and muting of lost frames for full rate speech channels".
[10] ETS 300 580-4 (GSM 06.12): "Digital cellular telecommunication system
(Phase 2); Comfort noise aspect for full rate speech traffic channels".
[11] ETS 300 580-5 (GSM 06.31): "Digital cellular telecommunication system
(Phase 2); Discontinuous Transmission (DTX) for full rate speech traffic
channel".

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[12] ETS 300 580-6 (GSM 06.32): "Digital cellular telecommunication system
(Phase 2); Voice Activity Detection (VAD)".
[13] ETS 300 591 (GSM 08.20): "Digital cellular telecommunications system
(Phase 2); Rate adaption on the Base Station System -Mobile- services
Switching Centre (BSS - MSC) interface".
[14] ETS 300 593 (GSM 08.52): "Digital cellular telecommunication system
(Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS)
interface; Interface principles".
[15] ETS 300 594 (GSM 08.54): "Digital cellular telecommunication system
(Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS)
interface; Layer 1 structure of physical circuits".
[16] ETS 300 596 (GSM 08.58): "Digital cellular telecommunications system
(Phase 2); Base Station Controller - Base Transceiver Station (BSC -BTS)
interface Layer 3 specification".
[17] ETS 300 597 (GSM 08.60): "Digital cellular telecommunications system
(Phase 2); Inband control of remote transcoders and rate adaptors for full rate
traffic channels".
[18] ETS 300 607-1 (GSM 11.10-1): "Digital cellular telecommunications system
(Phase 2); Mobile Station (MS) conformance specification; Part 1: Conformance
specification".
[19] ETS 300 609-1 (GSM 11.21): "Digital cellular telecommunications system
(Phase 2); Base Station System (BSS) equipment specification; Part 1: Radio
aspects".
[20] ITU-T Recommendation I.460: "Multiplexing, rate adaption and support of
existing interfaces".
[21] ITU-T Recommendation V.110: "Support of data terminal equipments with
V-Series type interfaces by an integrated services digital network".
[22] ETS 300 581-1 (GSM 06.02): "Digital cellular telecommunication system
(Phase 2); Half Rate speech; Part 1: Half rate speech processing functions".
[23] ETS 300 581-7 (GSM 06.06): Digital cellular telecommunications system; Half
rate speech; Part 7: ANSI-C code for the GSM half rate speech codec“.
[24] ETS 300 581-8 (GSM 06.07): "Digital cellular telecommunication system
(Phase 2); Half rate speech; Part 8: Test sequences for the GSM half rate
speech codec".
[25] ETS 300 581-2 (GSM 06.20): "Digital cellular telecommunication system
(Phase 2); Half rate speech; Part 2: Half rate speech transcoding".
[26] ETS 300 581-3 (GSM 06.21): "Digital cellular telecommunication system
(Phase 2);Half rate speech; Part 3: Substitution and muting of lost frames for
half rate speech channels".
[27] ETS 300 581-4 (GSM 06.22): "Digital cellular telecommunication system
(Phase 2); Half rate speech; Part 4: Comfort noise aspects for the half rate
speech traffic channels".
[28] ETS 300 581-5 (GSM 06.41): "Digital cellular telecommunication system
(Phase 2);Half rate speech; Part 5: Discontinuous Transmission (DTX) for half
rate speech traffic channel".

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[29] ETS 300 581-6 (GSM 06.42): "Digital cellular telecommunication system
(Phase 2); Half rate speech; Part 6: Voice Activity Detection (VAD)".
[30] ETS 300 598 (GSM 08.61): "Digital cellular telecommunications system
(Phase 2); Inband control of remote transcoders and rate adaptors for half rate
traffic channels".
[31] ETS 300 725 (GSM 06.54 ): "Digital cellular telecommunications system (Phase
2); Test vectors for the GSM Enhanced Full Rate (EFR) speech codec".
[32] ETS 300 723 (GSM 06.51): "Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech coding functions; General description".
[33] ETS 300 724 (GSM 06.53): "Digital cellular telecommunications system; ANSI-C
code for the GSM Enhanced Full Rate (EFR) speech codec".
[34] ETS 300 726 (GSM 06.60): "Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech transcoding".
[35] ETS 300 727 (GSM 06.61): "Digital cellular telecommunications system;
Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech
traffic channels".
[36] ETS 300 728 (GSM 06.62): "Digital cellular telecommunications system;
Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels".
[37] ETS 300 729 (GSM 06.81): "Digital cellular telecommunications system;
Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic
channels".
[38] ETS 300 730 (GSM 06.82): "Digital cellular telecommunications system; Voice
Activity Detection (VAD) for Enhanced Full Rate (EFR) speech traffic channels".
[39] ETS 300 609-2 (GSM 11.23): "Digital cellular telecommunications system
(Phase 2); Base Station System (BSS) equipment specification; Part 1:
Signalling aspects".
3 Definitions and abbreviations
3.1 Definitions
Error-free radio conditions A condition for a test signal applied to the antenna connector, defined in
subclause 4.1.1.1
Perfect radio conditions A condition for a test signal applied to the antenna connector, defined in
subclause 4.1.1.1
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply in addition to those given in ETR 100
(GSM 01.04) [1]:
AGCH Access Grant CHannel
BCCH Broadcast Control CHannel
BSS Base Station System
BTS Base Transceiver Station
CCU Channel Coder Unit
DTX Discontinuous Transmission
FACCH Fast Associated Control CHannel
FS Full rate Speech
HS Half rate Speech
MSC Mobile Switching Centre

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OMC Operations and Maintenance Centre
PCH Paging CHannel
PCM Pulse Code Modulation
RA Rate Adaption
RACH Random Access CHannel
TCH Traffic CHannel
SACCH Slow Associated Control CHannel
SDCCH Standalone Dedicated Control CHannel
SCH Synchronization Channel
4 Transcoding and rate adaption
The Transcoding and Rate Adaption Unit (TRAU) is a GSM entity which converts between the 64 kbit/s
per channel bit rate at the MSC and a net rate of 13 kbit/s for the radio interface in the case of Full Rate
(FR) speech. For terrestrial links the 13 kbit/s data is transmitted over 16 kbit/s after the addition of
synchronisation and control information. On the radio interface the 13 kbit/s is padded to 22.8 kbit/s after
channel coding. In the case of data the net bit rates used as the bearer can be either 12 kbit/s, 6 kbit/s or
3,6 kbit/s. Again channel coding results in a radio interface data rate of 22.8 kbit/s. While the transcoder is
considered functionally part of the BSS it can be located at either the MSC location, BSC location or BTS
location. This aspect is illustrated in figure 11.24-1. The 16 kbit/s terrestrial link to the remote transcoder
may be (4 to 1) multiplexed onto a single 64 bit/s link as shown in BSS types 2,4 and 6.
In situations where the TRAU is located remote from the radio interface (i.e. BSS type 2, 4-7) speech or
data is transferred between the TRAU and channel codec unit (CCU) in frames of fixed length of 320 bits
(20ms). These "TRAU frames" also carry control signals that signal frame type and timing information. For
example in-call modifications from speech to data will be signalled from the CCU to the TRAU within the
frame structure. In the case of timing control the CCU checks the synchronisation of the downlink radio
link and signals advance/retard information to the TRAU over the uplink TRAU frames. Corrections are
then made to the downlink phasing of the TRAUs. For more information see GSM 08.60 [17].
Testing for the transcoding function will be divided into three categories:
- speech transcoding/DTX which is independent of BSS type;
- data rate adaption;
and
- In-band control which relates to types 2,4-7.
4.1 Transcoder test points
To facilitate the standardization of the testing the following interfaces are required:
4.1.1 External interfaces
The mandatory external interfaces of the BSS (according to figure 11.24-1) are listed below:
1. The antenna connector.
2. The A-interface to the MSC.
An additional optional external interface may be required:
3. The separate OMC-interface.
4.1.1.1 Test signals applied to the antenna connector
The purpose of the tests in this specification are to test the transcoding function of the BSS. Where tests
are performed using the antenna connector as an external interface, the characteristics of the RF test
signal should be chosen so as to minimise the contribution of the BTS (especially its RF parts) the
measurement results.

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NOTE: The BTS can contribute to the measurement result is due to the introduction of bit
errors. This is most likely to occur if the level of the input signal is not large enough
compared to the noise floor of the receiver, but can also occur if the input signal
overloads the receiver.
The manufacturer may specify the RF characteristics of the test signal for these tests, which meet these
requirements.
If the manufacturer does not specify the characteristics of the test signal, the signal and general test
method defined in GSM 11.21 [19] for static reference sensitivity may be used, except that the level of the
signal should be increased by at least 20dB.
Perfect radio conditions: Using a test signal as defined above, applied continuously to the antenna
connector.
Error-free radio conditions: Using a test signal as defined above, applied for certain parts of the GSM
radio interface frame structure, as defined in each test.
Alternatively, an internal interface point within the BTS may be used, with a test signal comprising the bit
sequence which would result at the internal interface point for an error free test signal applied to the
antenna connector.
4.1.2 Internal test points and interfaces
In addition to the external interfaces in clause 4.1.1 the following internal logical interfaces shall as a
minimum be accessible in the equipment in order to carry out the measurements in this specification:
1. Input and output bit access to 104 kbit/s level, 13 bit linear PCM for full rate speech channels
(TCH/FS) in both directions of transmission and reset control of the speech encoder and decoder.
2. Output bit access after channel decoding including frame erasure information (FEI or BFI) for all
channel types.
3. Input bit access before channel encoding for all channel types.
4. The optional internal TRAU interface (referred to as Abis in GSM 08.60 [17]), if used.
Where an internal access is required, the implementation of this is up to the manufacturer. However, in
order to physically interface with the BSSTE, the implementation is restricted to the following options:
a. Direct physical access to the logical interface.
b. Physical access via a dedicated external interface adapter.
c. Physical access to bits (insertion and monitoring) before channel encoding/after channel decoding
via a loop-back over the radio path as defined in GSM 11.10-1 [18] for the Mobile Station.
d. Physical access to bits (insertion and monitoring) before channel encoding/after channel decoding
from the A-interface using the A-interface rate adaptation functions.
e. Physical access to bits (insertion and monitoring) before channel encoding/after channel decoding
from the Abis-interface using the 16 kbit/s Abis-interface rate adaptation and speech handling
functions, if any.
f. Physical access to 13 bit/8 kHz PCM samples via a special combination of 2 x A- or Abis-interface
64 kbit/s channels.
A dedicated external adapter shall, if used, be supplied by the BSS manufacturer.
The internal test points or interfaces are illustrated in figure 11.24-2 and figure 11.24-3 for the various
Base Station System types described in figure 11.24-1.
The detailed specifications of the interface points are:

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- Interface point x:
TCH/FS: Input and output 104 kbit/s = 13 bit linear PCM at 8 kHz sampling rate
Reset control of the full rate speech encoder
TCH/HS: Input and output 104 kbit/s = 13 bit linear PCM at 8 kHz sampling rate
Reset control of the half rate speech encoder
No other channels are applicable.
- Interface point x':
TCH/FS: Input and output 104 kbit/s = 13 bit linear PCM at 8 kHz sampling rate
Reset control of the full rate speech decoder (or at interface point y')
TCH/HS: Input and output 104 kbit/s = 13 bit linear PCM at 8 kHz sampling rate
Reset control of the half rate speech decoder
No other channels are applicable.
- Interface point y:
Speech:
TCH/FS: Input/output 13 kbit/s = 260 bits every 20 ms
TCH/HS: Input/output 5.6 kbit/s = 112 bits every 20 ms
NOTE 1: For BSS types 4-7 input/output control can be handled via the Abis-interface.
Data:
TCH/F9,6: Input 12 kbit/s = 60 bits every 5 ms
TCH/F4,8: Input 6 kbit/s = 60 bits every 10 ms
TCH/F2,4: Input 3,6 kbit/s = 72 bits every 10 ms
TCH/H4,8: Input 6 kbit/s = 60 bits every 20 ms
TCH/H2,4: Input 3,6 kbit/s = 72 bits every 20 ms
Signalling:
FACCH/F: Input 184 bits (23 octets) every 20 ms
FACCH/H: Input 184 bits (23 octets) every 40 ms
SACCH/TF: Input 184 bits (23 octets) every 480 ms
SACCH/TH: Input 184 bits (23 octets) every 480 ms
SACCH/C8: Input 184 bits (23 octets) every 470.77 ms
SACCH/C4: Input 184 bits (23 octets) every 470.77 ms
SDCCH/8: Input 184 bits (23 octets) every 235.38 ms
SDCCH/4: Input 184 bits (23 octets) every 235.38 ms
BCCH: Input 184 bits (23 octets) every 235.38 ms
PCH: Input 184 bits (23 octets) every 235.38 ms
AGCH: Input 184 bits (23 octets) every 235.38 ms
RACH: Not applicable
SCH: Input 5 x 25 = 125 bits every 235.38 ms
- Interface point y':
Speech:
TCH/FS: Input/Output 13 kbit/s = 260 bits every 20 ms
Reset control of the full-rate speech decoder (or at interface point x')
TCH/HS: Input/Output 5.6 kbit/s = 112 bits every 20 ms
NOTE 2: For BSS types 4-7 input/output and reset control can be handled via the Abis-interface.
All outputs of speech channels shall include the Bad Frame Indication (BFI). All bits shall be
available, i.e. also bits in erased frames. No extrapolation shall be done.

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Data:
TCH/F9,6: Output 12 kbit/s = 60 bits every 5 ms
TCH/F4,8: Output 6 kbit/s = 60 bits every 10 ms
TCH/F2,4: Output 3,6 kbit/s = 72 bits every 10 ms
TCH/H4,8: Output 6 kbit/s = 60 bits every 20 ms
TCH/H2,4: Output 3,6 kbit/s = 72 bits every 20 ms
Signalling:
FACCH/F: Output 184 bits (23 octets) every 20 ms
FACCH/H: Output 184 bits (23 octets) every 40 ms
SACCH/TF: Output 184 bits (23 octets) every 480 ms
SACCH/TH: Output 184 bits (23 octets) every 480 ms
SACCH/C8: Output 184 bits (23 octets) every 470.77 ms
SACCH/C4: Output 184 bits (23 octets) every 470.77 ms
...