ETSI ETS 300 737 ed.2 (1998-02)

Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels (GSM 08.60 version 5.1.1)

RE/SMG-020860QR1

Digitalni celični telekomunikacijski sistem (faza 2+) – Znotrajpasovno krmiljenje oddaljenih prekodirnikov (transkoderjev) in prilagodilnikov hitrosti za prometne kanale izboljšanega govora s polno hitrostjo (EFR) (GSM 08.60, različica 5.1.1)

General Information

• Status: Published
• Publication Date: 26-Feb-1998
• Technical Committee: SMG 2 - Radio
• Current Stage: 12 - Completion
• Due Date: 13-Feb-1998
• Completion Date: 27-Feb-1998
• Ref Project: SIST ETS 300 737 E2:2003 - Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels (GSM 08.60 version 5.1.1)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 737 E2:2003
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±=QRWUDMSDVRYQRNUPLOMHQMH
RGGDOMHQLKSUHNRGLUQLNRYWUDQVNRGHUMHYLQSULODJRGLOQLNRYKLWURVWL]DSURPHWQH
NDQDOHL]EROMãDQHJDJRYRUDVSROQRKLWURVWMR()5*60UD]OLþLFD
Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote
transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels
(GSM 08.60 version 5.1.1)
Ta slovenski standard je istoveten z: ETS 300 737 Edition 2
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 737 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 737 E2:2003

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SIST ETS 300 737 E2:2003
EUROPEAN ETS 300 737
TELECOMMUNICATION February 1998
STANDARD Second Edition
Source: SMG Reference: RE/SMG-020860QR1
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+);
Inband control of remote transcoders and rate adaptors for
Enhanced Full Rate (EFR) and full rate traffic channels
(GSM 08.60 version 5.1.1)
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
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
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 1998. All rights reserved.

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ETS 300 737 (GSM 08.60 version 5.1.1): February 1998
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
1.1 Normative references.7
1.2 Abbreviations .8
2 General Approach .8
3 Frame Structure .11
3.1 Speech Frames.11
3.2 O&M Frames .12
3.3 Data Frames.13
3.3.1 Data Frame (for Synchronisation) .13
3.3.2 Extended data frame (E-TRAU : data transport) .14
3.4 Idle Speech Frames .15
3.5 Coding.15
3.5.1 Coding of Speech Frames.16
3.5.2 Coding of O&M Frames .18
3.5.3 Coding of Data Frames.18
3.5.4 Coding of Extended Data Frames .18
3.5.5 Coding of Idle Speech Frames.19
3.6. Order of Bit Transmission .19
4 Procedures .19
4.1 Remote Control of Transcoders and Rate Adaptors .19
4.2 Resource Allocation.20
4.3 Resource Release.20
4.4 In Call Modification .20
4.5 Transfer of Idle Frames .21
4.5.1 In Full rate data case:.21
4.5.2 In Full rate speech case:.21
4.5.3 In Enhanced Full rate speech case:.21
4.6 Procedures for Speech Frames.21
4.6.1 Time Alignment of Speech Frames.21
4.6.1.1 Initial Time Alignment State.21
4.6.1.2 The Static Time Alignment State .22
4.6.1.3 Initiation at Resource Allocation.24
4.6.1.4 Time Alignment During Handover.24
4.6.1.4.1 BSS External Handover.24
4.6.1.4.2 BSS Internal Handover.24
4.6.2 Procedures for Discontinuous Transmission (DTX) .24
4.6.2.1 DTX procedures in the uplink direction.24
4.6.2.2 DTX procedures in the downlink direction.24
4.7 Procedures for Data Frames.25
4.7.1 9.6 and 4.8 kbit/s channel coding.25
4.7.1.1 The RAA Function.25
4.7.1.2 The RA1/RA1' Function.26
4.7.1.3 The RA2 Function.26
4.7.1.4 Procedures for 8 kbit/s intermediate rate adaption rate .26
4.7.1.5 Procedures for 16 kbit/s intermediate rate adaption rate.26
4.7.1.6 Support of Non-Transparent Bearer Applications.27
4.7.2 14.5 kbit/s channel coding.27
4.7.2.1 The RAA’ Function.27
4.7.2.2 The RA1’/RAA' Function.27

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4.7.2.3 The RA2 Function .27
4.8 Frame Synchronization.27
4.8.1 Search for Frame Synchronization.27
4.8.2 Frame Synchronization After Performing Downlink Timing Adjustments.27
4.8.3 Frame Synchronization Monitoring and Recovery.28
4.9 Correction/detection of bit errors on the terrestrial circuits .29
4.9.1 Error Detection on the Control Bits.29
4.9.1.1 General Procedure.29
4.9.1.2 Speech Frames .29
4.9.2 Handling of frames received with errors.29
4.9.2.1 In case of Full Rate: .29
4.9.2.2 In case of Enhanced Full rate:.30
4.10 Procedures for Operation & Maintenance.30
4.10.1 Transfer of O&M Information Between the TRAU and the BSC.30
4.10.2 Procedures in the TRAU.30
4.10.3 Procedures in the BSC.30
4.10.3.1 Use of O&M Frames .31
4.10.4 Procedures in the BTS .31
History.32

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the inband control of remote transcoders and rate adaptors for full rate speech,
Enhanced Full rate speech and full rate data within the Digital cellular telecommunications system
(Phase 2+).
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI/PNE Rules.
Transposition dates
Date of adoption of this ETS: 23 January 1998
Date of latest announcement of this ETS (doa): 31 May 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 November 1998
Date of withdrawal of any conflicting National Standard (dow): 30 November 1998

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1 Scope
When 64 kbit/s traffic channels are used on the Abis interface, the speech shall be coded according to
CCITT Recommendation G.711 and the data rate adaptation shall be as specified in GSM 04.21 and GSM
08.20.
In the case where 16 kbit/s traffic channels are used for full rate speech or enhanced full rate speech or
full rate data service, then this specification shall apply for frame structure and for control of remote
transcoders and additional rate adaptors.
The use and general aspects of the Abis interface are given in GSM 08.51.
NOTE: This specification should be considered together with the GSM 06 series of
specifications, GSM 04.21 (Rate Adaptation on the MS-BSS Interface) and GSM
08.20 (Rate Adaptation on the BS/MSC Interface).
1.1 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] GSM 01.04 (ETR 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 04.06 (ETS 300 938): "Digital cellular telecommunications system; Mobile
Station - Base Station System (MS - BSS) interface; Data Link (DL) layer
specification".
[3] GSM 04.21 (ETS 300 945): "Digital cellular telecommunications system; Rate
adaption on the Mobile Station - Base Station System (MS - BSS) interface".
[4] GSM 06.01 (ETS 300 960): "Digital cellular telecommunications system; Full rate
speech; Processing functions".
[5] GSM 06.10 (ETS 300 961): "Digital cellular telecommunications system; Full rate
speech; Transcoding".
[6] GSM 06.11 (ETS 300 962): "Digital cellular telecommunications system; Full rate
speech; Substitution and muting of lost frames for full rate speech channels".
[7] GSM 06.12 (ETS 300 963): "Digital cellular telecommunications system; Full rate
speech; Comfort noise aspect for full rate speech traffic channels".
[8] GSM 06.31 (ETS 300 964): "Digital cellular telecommunications system; Full rate
speech; Discontinuous Transmission (DTX) for full rate speech traffic channels".
[9] GSM 06.32 (ETS 300 965): "Digital cellular telecommunications system; Voice
Activity Detector (VAD)".
[10] GSM 08.20: "Digital cellular telecommunications system; Rate adaption on the
Base Station System - Mobile-services Switching Centre (BSS - MSC)
interface".
[11] GSM 08.51: "Digital cellular telecommunications system; Base Station Controller
- Base Transceiver Station (BSC - BTS) interface; General aspects".

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[12] GSM 08.54: "Digital cellular telecommunications system (Phase 2+); Base
Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 1
structure of physical circuits".
[13] GSM 08.58: "Digital cellular telecommunications system (Phase 2+); Base
Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 3
specification".
[14] GSM 12.21 (ETS 300 623): "Digital cellular telecommunications system
(Phase 2); Network Management (NM) procedures and message on the A-bis
interface".
[15] CCITT Recommendation G.711: "Pulse code modulation (PCM) of voice
frequencies".
[16] CCITT Recommendation I.460: "Multiplexing, rate adaption and support of
existing interfaces".
[17] CCITT Recommendation V.110: "Support of data terminal equipments (DTEs)
with V-Series interfaces by an integrated services digital network".
[18] GSM 06.51 (ETS 300 723): "Digital cellular telecommunications system;
Enhanced Full rate speech processing functions".
[19] GSM 06.60 (ETS 300 726): "Digital cellular telecommunications system;
Enhanced Full rate speech transcoding".
[20] GSM 06.61 (ETS 300 727): "Digital cellular telecommunications system;
Substitution and muting of lost frames for Enhanced Full rate speech channels".
[21] GSM 06.62 (ETS 300 728): "Digital cellular telecommunications system; Comfort
noise aspect for Enhanced Full rate speech traffic channels".
[22] GSM 06.81 (ETS 300 729): "Digital cellular telecommunications system;
Discontinuous Transmission (DTX) for Enhanced Full rate speech traffic
channel".
[23] GSM 06.82 (ETS 300 730): "Digital cellular telecommunications system; Voice
Activity Detection (VAD)".
1.2 Abbreviations
Abbreviations used in this specification are listed in GSM 01.04.
2 General Approach
When the transcoders/rate adaptors are positioned remote to the BTS, the information between the
Channel Codec Unit (CCU) and the remote Transcoder/Rate Adaptor Unit (TRAU) is transferred in frames
with a fixed length of 320 bits (20 mS). In this specification, these frames are denoted "TRAU frames".
Within these frames, both the speech/data and the TRAU associated control signals are transferred.
The Abis interface should be the same if the transcoder is positioned 1) at the MSC site of the BSS or if it
is positioned 2) at the BSC site of the BSS. In case 1), the BSC should be considered as transparent for
16 kbit/s channels.
In case of 4,8 and 9,6 kbit/s channel coding when data is adapted to the 320 bit frames, a conversion
function is required in addition to the conversion/rate adaption specified in GSM 08.20. This function
constitutes the RAA. In case of 14,5 kbit/s channel coding, no RAA rate adaption is required because
V.110 framing is not used.

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The TRAU is considered a part of the BSC, and the signalling between the BSC and the TRAU (e.g.
detection of call release, handover and transfer of O&M information) may be performed by using BSC
internal signals. The signalling between the CCU and the TRAU, using TRAU frames as specified in this
specification, is mandatory when the Abis interface is applied.
NOTE: If standard 64 kbit/s switching is used in the BSC, multiplexing according to CCITT
Recommendation I.460 should apply at both sides of the switch.
In figure 2.1, a possible configuration of the TRAU and the CCU is shown.
The functions inside the TRAU are:
- "Remote Transcoder and Rate Adaptor Control Function" (RTRACF);
- "Remote Speech Handler Function" (RSHF);
- The RAA function in case of 4.8 and 9.6 kbit/s channel coding;
- The RAA’ function in case of 14.5 kbit/s channel coding;
- The RA2 function;
- The transcoder function.
The functions inside the CCU are:
- "Transcoder and Rate Adaptor Control Function" (TRACF);
- "Speech Handler Function" (SHF);
- The RAA function in case of 4.8 and 9.6 kbit/s channel coding;
- The RA1/RA1' function in case of 4.8 and 9.6 kbit/s channel coding;
- The RA1’/RAA’ function in case of 14.5 kbit/s channel coding;
- The channel codec function.
This specification will not describe the procedures inside the TRAU and the CCU. The layout in figure 2.1 is
only intended as a reference model.

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Figure 2.1: Functional entities for handling of remote control of remote transcoders and rate
adaptors
NOTE: This figure applies only for 4,8 and 9,6 kbit/s channel coding

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3 Frame Structure
3.1 Speech Frames
Bit number
Octet no. 12345678
0 00000000
1 00000000
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 C14 C15
4 1 D1 D2 D3 D4 D5 D6 D7
5 D8 D9 D10 D11 D12 D13 D14 D15
6 1 D16 D17 D18 D19 D20 D21 D22
7 D23 D24 D25 D26 D27 D28 D29 D30
8 1 D31 D32 D33 D34 D35 D36 D37
9 D38 D39 D40 D41 D42 D43 D44 D45
10 1 D46 D47 D48 D49 D50 D51 D52
11 D53 D54 D55 D56 D57 D58 D59 D60
12 1 D61 D62 D63 D64 D65 D66 D67
13 D68 D69 D70 D71 D72 D73 D74 D75
14 1 D76 D77 D78 D79 D80 D81 D82
15 D83 D84 D85 D86 D87 D88 D89 D90
16 1 D91 D92 D93 D94 D95 D96 D97
17 D98 D99 D100 D101 D102 D103 D104 D105
18 1 D106 D107 D108 D109 D110 D111 D112
19 D113 D114 D115 D116 D117 D118 D119 D120
20 1 D121 D122 D123 D124 D125 D126 D127
21 D128 D129 D130 D131 D132 D133 D134 D135
22 1 D136 D137 D138 D139 D140 D141 D142
23 D143 D144 D145 D146 D147 D148 D149 D150
24 1 D151 D152 D153 D154 D155 D156 D157
25 D158 D159 D160 D161 D162 D163 D164 D165
26 1 D166 D167 D168 D169 D170 D171 D172
27 D173 D174 D175 D176 D177 D178 D179 D180
28 1 D181 D182 D183 D184 D185 D186 D187
29 D188 D189 D190 D191 D192 D193 D194 D195
30 1 D196 D197 D198 D199 D200 D201 D202
31 D203 D204 D205 D206 D207 D208 D209 D210
32 1 D211 D212 D213 D214 D215 D216 D217
33 D218 D219 D220 D221 D222 D223 D224 D225
34 1 D226 D227 D228 D229 D230 D231 D232
35 D233 D234 D235 D236 D237 D238 D239 D240
36 1 D241 D242 D243 D244 D245 D246 D247
37 D248 D249 D250 D251 D252 D253 D254 D255
38 1 D256 D257 D258 D259 D260 C16 C17
39 C18 C19 C20 C21 T1 T2 T3 T4

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3.2 O&M Frames
Bit number
Octet no. 1 2345 678
0 0 0000 000
1 0 0000 000
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 C14 C15
4 1 D1 D2 D3 D4 D5 D6 D7
5 D8 D9 D10 D11 D12 D13 D14 D15
6 1 D16 D17 D18 D19 D20 D21 D22
7 D23 D24 D25 D26 D27 D28 D29 D30
8 1 D31 D32 D33 D34 D35 D36 D37
9 D38 D39 D40 D41 D42 D43 D44 D45
10 1 D46 D47 D48 D49 D50 D51 D52
11 D53 D54 D55 D56 D57 D58 D59 D60
12 1 D61 D62 D63 D64 D65 D66 D67
13 D68 D69 D70 D71 D72 D73 D74 D75
14 1 D76 D77 D78 D79 D80 D81 D82
15 D83 D84 D85 D86 D87 D88 D89 D90
16 1 D91 D92 D93 D94 D95 D96 D97
17 D98 D99 D100 D101 D102 D103 D104 D105
18 1 D106 D107 D108 D109 D110 D111 D112
19 D113 D114 D115 D116 D117 D118 D119 D120
20 1 D121 D122 D123 D124 D125 D126 D127
21 D128 D129 D130 D131 D132 D133 D134 D135
22 1 D136 D137 D138 D139 D140 D141 D142
23 D143 D144 D145 D146 D147 D148 D149 D150
24 1 D151 D152 D153 D154 D155 D156 D157
25 D158 D159 D160 D161 D162 D163 D164 D165
26 1 D166 D167 D168 D169 D170 D171 D172
27 D173 D174 D175 D176 D177 D178 D179 D180
28 1 D181 D182 D183 D184 D185 D186 D187
29 D188 D189 D190 D191 D192 D193 D194 D195
30 1 D196 D197 D198 D199 D200 D201 D202
31 D203 D204 D205 D206 D207 D208 D209 D210
32 1 D211 D212 D213 D214 D215 D216 D217
33 D218 D219 D220 D221 D222 D223 D224 D225
34 1 D226 D227 D228 D229 D230 D231 D232
35 D233 D234 D235 D236 D237 D238 D239 D240
36 1 D241 D242 D243 D244 D245 D246 D247
37 D248 D249 D250 D251 D252 D253 D254 D255
38 1 D256 D257 D258 D259 D260 D261 D262
39 D263 D264 S1 S2 S3 S4 S5 S6

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3.3 Data Frames
3.3.1 Data Frame (for Synchronisation)
Bit number
Octet no. 12345678
0 00000000
1 00000000
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 C14 C15
41 .
51 .
61 .
7 1 Data frame position 1
8 1 63 bits.
9 1 (72 bits including bit position 1)
10 1
11 1
12 1
13 1
14 1
15 1
161 1 Data frame position 2
17 1
18 1
19 1
20 1
21 1
22 1
23 1
24 1
25 1 Data frame position 3
26 1
27 1
28 1
29 1
30 1
31 1
32 1
33 1 Data frame position 4
34 1
35 1
36 1
37 1
38 1
39 1

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3.3.2 Extended data frame (E-TRAU : data transport)
Bit number
Octet no. 12345678
0 00000000
1 00000000
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 M1 M2
4 D1 D2 .
5
6
7 Data block of 288 data bits and M1, M2.
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39 . D287 D288

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3.4 Idle Speech Frames
Bit number
Octet no. 12345678
0 00000000
1 00000000
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 C14 C15
4 11111111
5 11111111
6 11111111
7 11111111
8 11111111
9 11111111
10 11111111
11 11111111
12 11111111
13 11111111
14 11111111
15 11111111
16 11111111
17 11111111
18 11111111
19 11111111
20 11111111
21 11111111
22 11111111
23 11111111
24 11111111
25 11111111
26 11111111
27 11111111
28 11111111
29 11111111
30 11111111
31 11111111
32 11111111
33 11111111
34 11111111
35 11111111
36 11111111
37 11111111
38 111111 C16 C17
39 C18 C19 C20 C21 T1 T2 T3 T4
3.5 Coding
In the following sections, the coding of the frames is described. Any spare or not used control bits should
be coded binary "1".
For all frame types the octet 0, 1 and the first bit of octets 2, 4, 6, 8, . 38 are used as frame sync.

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3.5.1 Coding of Speech Frames
Control bits (C-bits):
Description Uplink Downlink
C1C2C3C4 C5 C1C2C3C4 C5
Frame type FR Speech: 0 0 0 1 0. Speech: 1 1 1 0 0
(Bits C1 - C5).    EFR Speech: 1 1 0 1 0 Speech: 1 1 0 1 0
Time Binary number indicating the Binary number indicating
Alignment required timing adjustment to the timing adjustment made.
(Bits C6 - C11) be made in steps of 250/500 ms.
The following values apply for the coding
C6C7  . . .  C11
0 0 0 0 0 0 No change in frame timing
0 0 0 0 0 1 Delay frame 1 x 500 ms
0 0 0 0 1 0 Delay frame 2 x 500 ms
      .  .  . .
      .  .  . .
1 0 0 1 1 1 Delay frame 39 x 500 ms
1 0 1 0 0 0 Not used
      .  .  . .
1 1 1 1 0 1 Not used
1 1 1 1 1 0 Delay frame 1 x 250 ms
1 1 1 1 1 1 Advance frame 250 ms
Frame indicators. The definition C12: BFI C12 - C15: Spare
and coding of these indicators 0 : BFI = 0
are given in GSM 06.31. 1 : BFI = 1 IF FR. Speech
C13 C14: SID ELSE
Bits C12 - C16 0   0 :SID = 0 C12: UFE
0   1 :SID = 1 0 :UFE=0 bad uplink frame
1   0 :SID = 2 1 : UFE=1 good up-link frame
Downlink
Uplink Frame Error C15: TAF
(UFE) C12 0 : TAF = 0
(see subclause 4.8.3) 1 : TAF = 1 C13 - C15: spare
C16: Spare C16: SP
0 : SP = 0
1 : SP = 1
DTX indicator C17: DTXd C17: Spare
0 : DTX not applied
1 : DTX applied
Bits C18 - C21 Spare Spare

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Data Bits (D-bits):
Bits D1 . D260: Speech block transferred in the same order as output from the transcoder (see
GSM 06.10).
For Enhanced Full Rate Speech:
The speech block is subdivided in five subsets. The order within a given subset is the same as output from
the transcoder (see ETS 300 726, GSM 06.60). Three parity bits are added at the end of each sub-set.
These parity bits are added to the bits of the subset, according to a degenerate (shortened) cyclic code
using the generator polynomial:
3
g(D) = D + D + 1
The encoding of the cyclic code is performed in a systematic form which means that, in GF(2), the
polynomial:
n n-1 3 2
d(m)D + d(m+1)D + .+ d(m + n-3)D + p(0)D + p(1)D + p(2)
where p(0), p(1), p(2) are the parity bits, when divided by g(D), yields a remainder equal to:
2
1 + D + D
For every CRC, the transmission order is p(0) first followed by p(1) and p(2) successively.
Bit D1 : spare (binary "1").
Bits D2.D39 : Indexes of the LSF submatrices.
Bits D40.D42 : CRC over bits D1 to D22, D25 to D27 and D29.
Bits D43.D95 : Indexes of the parameters of first sub-frame.
Bits D96.D98 : CRC over bits D43 to D52, D91 and D92.
Bits D99.D148 : Indexes of the parameters of second sub-frame.
Bits D149.D151 : CRC over bits D99 to D103, D105, D144 and D145.
Bits D152.D204 : Indexes of the parameters of third sub-frame.
Bits D205.D207 : CRC over bits D152 to D161, D200 and D201.
Bits D208.D257 : Indexes of the parameters of fourth sub-frame.
Bits D258.D260 : CRC over bits D208 to D212, D214, D253 and D254.
Time Alignment Bits:
Bits T1 . T4: Bits positioned at the end of the downlink frames. If the timing of the frame is to
be advanced 250 μS, these 4 bits are not transferred in order to reduce the frame
length accordingly. When transferred the bits are set to binary "1".

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3.5.2 Coding of O&M Frames
Control bits (C-bits):
Description Uplink Downlink
C1C2C3C4 C5 C1C2C3C4 C5
Frame type 0 0 1 0 1 : O&M 1 1 0 1 1 : O&M
Bits C1 - C5
Bits C6 - C15 Spare Spare
Data Bits (D-bits):
Bits D1 . D264: Bits used for transfer of O&M information. The coding and use of these bits are
left to the manufacturer of the BSC/TRAU.
Spare Bits:
Bits S1 . S6: Spare
3.5.3 Coding of Data Frames
Control bits (C-bits):
Description Uplink Downlink
Frame type. C1C2C3C4 C5 C1C2C3C4 C5
Bits C1 - C5 0 1 0 0 0 : Data 1 0 1 1 0 : Data
except 14.5 except 14.5
1) 1)
1 0 1 0 0 : Data14.5 1 0 1 0 0 : Data 14.5
Intermediate RA bit 0: 8 kbit/s 0: 8 kbit/s
rate. 1: 16 kbit/s 1: 16 kbit/s
Bit C6
for data services
except 14.5
Spare Spare Spare
for Data 14.5
Bits C7 - C15 Spare Spare
NOTE 1: The Data frame is in case of data 14.5 kbit/s used only for synchronization purposes.
The data bits are in this case set according to subclause 4.5.1.
3.5.4 Coding of Extended Data Frames
Control bits (C-bits):

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Description Uplink Downlink
Frame type. C1C2C3C4 C5 C1C2C3C4 C5
Bits C1 - C5 1 1 1 1 1 : 1 1 1 1 1 :
Extended Data Extended data
frame 14.5 kbit/s Frame 14.5
Bit C6
Idle/Data/UFE Idle/data UFE
Frame indication
Bits C7 - C13 Spare Spare
Multi Frame Structure M1, M2 M1, M2
defined in GSM 04.21
Bits M1, M2
3.5.5 Coding of Idle Speech Frames
Control bits (C-bits):
Description Uplink Downlink
C1C2C3C4 C5 C1C2C3C4 C5
Frame type. 1 0 0 0 0 : Idle Speech 0  1 1 1 0 : Idle Speech
Bits C1 - C5
Bits C6 - C21 Coding as for Coding as for
Speech frames. Speech frames.
Time Alignment Bits:
Bits T1 . T4: Coding as for Speech frames.
3.6. Order of Bit Transmission
The order of bit transmission is:
The first octet
...