Digital audio broadcasting system - Specification of the DAB command set for receivers (DCSR)

This standard describes a command set which should be used to control DAB receivers. The coding of these commands is also described. This command set is intended to be used on different physical bus systems. The coding should be mapped transparently on different physical interfaces. Selection conflict management, dynamic bandwidth problems and the device addressing are not within the scope of this document.

Digitales Tonrundfunksystem - Spezifikation des DAB-Befehlssatzes für Empfänger (DCSR)

Dieses Schriftstück beschreibt einen Befehlssatz, der für die Steuerung von DAB-Empfängern benutzt werden sollte und auch die Codierung der Befehle. Dieser Befehlssatz ist dazu bestimmt, in verschiedenen physikalischen Bussystemen benutzt zu werden. Die Codierung sollte an verschiedenen physikalischen Schnittstellen transparent konvertiert werden. Auswahl-Konfliktmanagement, dynamische Bandbreitenprobleme und die Adressierung der Baueinheiten liegen nicht im Anwendungsbereiches dieser Norm.

Système de radiodiffusion sonore numérique - Spécifications du jeu de commande DAB pour le récepteur (DCSR)

Le présent document décrit un ensemble de commandes qu’il convient d’utiliser pour les récepteurs DAB. Il décrit également le codage de ces commandes. Cet ensemble de commandes est destiné à être utilisé avec différents systèmes de bus physiques. Il est recommandé que le codage soit appliqué de manière transparente sur différentes interfaces physiques. Le présent document ne couvre pas les points suivants : gestion des conflits de sélection, problèmes de largeur de bande dynamique et adressage des appareils.

Digital audio broadcasting system - Specification of the DAB command set for receivers (DCSR)

General Information

Status
Published
Publication Date
09-Nov-2000
Current Stage
6060 - Document made available
Due Date
10-Nov-2000
Completion Date
10-Nov-2000

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SLOVENSKI STANDARD
SIST EN 50320:2001
01-september-2001
Digital audio broadcasting system - Specification of the DAB command set for
receivers (DCSR)

Digital audio broadcasting system - Specification of the DAB command set for receivers

(DCSR)
Digitales Tonrundfunksystem - Spezifikation des DAB-Befehlssatzes für Empfänger
(DCSR)

Système de radiodiffusion sonore numérique - Spécifications du jeu de commande DAB

pour le récepteur (DCSR)
Ta slovenski standard je istoveten z: EN 50320:2000
ICS:
33.160.20 Radijski sprejemniki Radio receivers
SIST EN 50320:2001 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50320:2001
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SIST EN 50320:2001
EUROPEAN STANDARD EN 50320
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2000
ICS 33.160.20
English version
Digital audio broadcasting system
Specification of the DAB command set for receivers (DCSR)
Système de radiodiffusion sonore Digitales Tonrundfunksystem -
numérique - Spécifications du jeu de Spezifikation des DAB-Befehlssatzes
commande DAB pour le récepteur (DCSR) für Empfänger (DCSR)

This European Standard was approved by CENELEC on 2000-01-01. CENELEC members are bound to

comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and

notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,

Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,

Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2000 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50320:2000 E
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Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 206,
Consumer equipment for entertainment and information and related sub-systems.

The text of the draft was submitted to the Unique Acceptance Procedure and was approved by

CENELEC as EN 50320 on 2000-01-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2001-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2003-01-01
__________
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Contents

1 General..................................................................................................................................5

1.1 Scope................................................................................................................................5

1.2 Structure of DCSR.............................................................................................................5

2 Reference table.....................................................................................................................7

3 Responses............................................................................................................................8

3.1 accepted............................................................................................................................8

3.2 rejected..............................................................................................................................8

3.3 interim................................................................................................................................9

3.4 command_not_implemented.............................................................................................9

3.5 busy.................................................................................................................................10

3.6 syntax_error.....................................................................................................................10

4 Commands and notifications ...............................................................................................11

4.1 get_receiver_capability....................................................................................................11

4.2 notify_receiver_capability................................................................................................12

4.3 tune..................................................................................................................................24

4.4 get_tii...............................................................................................................................25

4.5 notify_tii...........................................................................................................................27

4.6 select_tii...........................................................................................................................30

4.7 get_pad............................................................................................................................32

4.8 notify_pad........................................................................................................................33

4.9 select_pad.......................................................................................................................34

4.10 get_figs........................................................................................................................36

4.11 notify_fig......................................................................................................................42

4.12 select_figs....................................................................................................................43

4.13 get_channel.................................................................................................................44

4.14 notify_channel.............................................................................................................46

4.15 select_channel.............................................................................................................48

4.16 get_selection_status....................................................................................................51

4.17 notify_selection_status................................................................................................52

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4.18 search_for_ensemble..................................................................................................54

4.19 notify_search_for_ensemble.......................................................................................59

4.20 set_drc.........................................................................................................................60

4.21 get_audio_info.............................................................................................................62

4.22 notify_audio_info.........................................................................................................63

4.23 get_dab_status............................................................................................................64

4.24 notify_dab_status........................................................................................................64

4.25 set_dab_status_auto_notification................................................................................68

4.26 get_active_info............................................................................................................71

4.27 notify_active_info.........................................................................................................72

4.28 notify_service_following...............................................................................................72

4.29 manufacturer_specific_command................................................................................73

4.30 manufacturer_specific_notification..............................................................................74

4.31 notify_error_message..................................................................................................75

5 Example of DCSR coding....................................................................................................77

6 Guidelines for data fields, reserved for future use (Rfu’s) or addition (Rfa’s) and

table entries, reserved for future definition (Rfd’s)...............................................................83

7 Glossary..............................................................................................................................84

8 References..........................................................................................................................84

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1 General
1.1 Scope

This standard describes a command set which should be used to control DAB receivers. The

coding of these commands is also described. This command set is intended to be used on

different physical bus systems. The coding should be mapped transparently on different

physical interfaces.

Selection conflict management, dynamic bandwidth problems and the device addressing are not

within the scope of this document.
1.2 Structure of DCSR

The DCSR paper describes the Instruction Set, which consists of three types of messages as

follows:

The “Command” is used by a controlling device in order to tell the DAB receiver to perform a

certain action, to deliver certain information or to move into a certain state.

The “Response” contains only a quick reaction (t1 < 100 ms, bus transfer time not included) to

the “Command”, e.g. accepted, rejected, busy. If the final response cannot be provided within

100 ms an interim response shall be sent within 100 ms. t1x shall be zero if no interim response

is sent. This response is mandatory and returned to the sender of the command.

The “Notification” contains the entire answer to the “Command”. The commands are considered

from the DAB receiver point of view. The notifications are sent to the controller or to the

specified output.

A new command shall not be sent before the final response of the previous command was

received (t2 ≥ 0)
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DAB
Controller
Receiver
t1x
time
Figure 1 - General command response structure
NOTE All parameter fields are always present unless otherwise stated.
The DCSR structure is coded as follows:
2 bits 6 bits bytes
b b b b b b
1 0 5 0 *8-1 0
category_code reference_code parameters
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2 Reference table
category code reference code
get_receiver_capability 0x1 0x01
tune 0x1 0x02
get_tii 0x1 0x03
select_tii 0x1 0x04
get_pad 0x1 0x05
select_pad 0x1 0x06
get_figs 0x1 0x07
select_figs 0x1 0x08
get_channel 0x1 0x09
select_channel 0x1 0x0A
get_selection_status 0x1 0x0B
search_for_ensemble 0x1 0x0C
set_drc 0x1 0x0D
get_audio_info 0x1 0x0E
get_dab_status 0x1 0x0F
set_dab_status_auto_notification 0x1 0x10
get_active_info 0x1 0x11
manufacturer_specific_command 0x1 0x20
accepted 0x2 0x01
rejected 0x2 0x02
interim 0x2 0x03
command_not_implemented 0x2 0x04
busy 0x2 0x05
syntax_error 0x2 0x06
notify_receiver_capability 0x3 0x01
notify_tii 0x3 0x03
notify_pad 0x3 0x05
notify_fig 0x3 0x07
notify_channel 0x3 0x09
notify_selection_status 0x3 0x0B
notify_search_for_ensemble 0x3 0x0C
notify_audio_info 0x3 0x0E
notify_dab_status 0x3 0x0F
notify_active_info 0x3 0x11
notify_service_following 0x3 0x12
manufacturer_specific_notification 0x3 0x20
notify_error_message 0x3 0x30
Category code 0x1: Command
0x2: Response
0x3: Notification
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3 Responses
3.1 accepted
Category:
Response (mandatory)
Purpose:

The receiver indicates to the controller that it is able to start the execution of the

command. No notify_error_message is allowed to follow, but other notifications may

follow.
Syntax:
accepted ()
Parameter:
none
3.2 rejected
Category:
Response (mandatory)
Purpose:

The receiver indicates to the controller that it can not process the command (e.g.

parameter out of range).

A notify_error_message will follow or in case of a manufacturer_specific_command a

manufacturer_specific_notification (containing the error message) will follow.
Syntax:
rejected ()
Parameter:
none
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3.3 interim
Category:
Response (mandatory)
Purpose:

The receiver indicates to the controller that it can not start executing the command within

100 ms. Subsequent to an initial response of INTERIM, the receiver shall not send any

additional INTERIM responses for this command. The receiver shall send a final
response when the command execution is started. No further command is allowed
before the final response is received.
Syntax:
interim ()
Parameter:
none
3.4 command_not_implemented
Category:
Response (mandatory)
Purpose:

The receiver indicates to the controller that it can not process the command, because

this command is not implemented in the receiver.
No notification will follow.
Syntax:
command_not_implemented ()
Parameter:
none
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3.5 busy
Category:
Response (mandatory)
Purpose:

The receiver indicates to the controller that it can not process the command at this time,

because the receiver is busy. The controller should send this command again later.

No notification will follow.
Syntax:
busy ()
Parameter:
none
3.6 syntax_error
Category:
Response (mandatory)
Purpose:

The receiver indicates to the controller that he can not process the command, because

there is a syntactical error in the received command (e.g. wrong number of parameters).

No notification will follow.
Syntax:
syntax_error ()
Parameter:
none
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4 Commands and notifications

All meaningless command parameters are to be ignored (handled as ‘don’t care’) by the

receiver.
4.1 get_receiver_capability
Category:
Command (mandatory)
Purpose:
The controller asks the DAB receiver for its capabilities.
Syntax:
get_receiver_capability ()
Parameter:
none
Reaction:
response(accepted)
notify_receiver_capability(...)
The receiver provides the receiver capabilities.
response(rejected)
notify_error_message(…)
response(interim)
response(busy)
response(syntax_error)
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4.2 notify_receiver_capability
Category:
Notification (mandatory)
Purpose:
The DAB receiver provides its capabilities to the controller.
Syntax:

notify_receiver_capability (dcsr_id, dcsr_profile, manufacturer_id, model_number,

model_year, serial_number, freq_range, transmission_mode, max_net_bitrate,
max_cu_num, num_subch, tii, sf, drc, acs, pad, aic, audio_info, aud_dec,
vid_dec, fig_filtering, Rfa, service_following, interface_descriptor)
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1 byte 4 bytes 2 bytes 2 bytes 1 byte
b b b b b b b b b b
7 0 31 0 15 0 15 0 7 0
dcsr_id dcsr_profile manufacturer_id model_number model_year ...
1 byte 1 byte
b b b b
15 8 7 0
asc_1 asc_2
3 bytes 1 byte 1 byte 10 bits
b b b b b b b b
23 0 7 0 7 0 9 0
serial_number freq_range transmission_mode max_net_bitrate max_cu_num ...
16 bytes 2 bytes
b b b b
127 0 15 0
freq_table freq_band freq_band_flex
1 byte 19 bits 19 bits 19 bits 19 bits bits
b b b b b b b b b b b b
7 0 18 0 18 0 18 0 18 0 -1 0
num_freq_flex start_freq 1 end_freq 1 ... start_freq n end_freq n padding
6 bits 1 byte 4 bits 4 bits 1 byte 4 bits 1 bit 3 bit 1 bit 1 bit
b b b b b b b b b b b b b b b b b
5 0 7 0 3 0 3 0 7 0 3 0 0 2 0 0 0
num_subch tii sf drc acs pad aic audio_info aud_dec vid_dec ...
2 bits 4 bits 2 byte
b b b b b b
1 3 0 15 0
fig_filtering Rfa service_following interface_descriptor
1 byte
b b
7 0
num_i/o interface 1 ... interface n
1 bit 7 bit 4 bit 4 bit 1 byte 1 byte
b b b b b b b b b b b
0 6 0 3 0 3 0 7 0 7 0
in/out I/O_Id Rfa num_protocols protocol 1 ... protocol m
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Parameter:
dcsr_id

This 8-bit field, coded as unsigned binary number, shall specify the DCSR Identifier

(1...254). The DCSR Identifier determines the supported DCSR version. Since the DCSR

versions are backward compatible, a certain dcsr_id means, all lesser dcsr_id’s are also

supported.
b ...b
7 0
0000 0000 signals no information
0000 0001 DCSR version 1
0000 0010 DCSR version 2
... ...
1111 1110 DCSR version 254
1111 1111 Rfd (escape option)
dcsr_profile

This 32 -bit field indicates which optional commands and notifications are implemented

in the receiver.
Bit flag
b0 get_tii
b1 get_pad
b2 select_tii
b3 select_pad
b4 select_figs
b5 set_drc
b6 get_audio_info
b7 get_channel
b8 notify_channel
b9 manufacturer specific command
b10..b31 Rfa
The flags shall be coded as follows bi (i=0...31).
0 : optional command not implemented
1 : optional command implemented
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manufacturer_id

This 16-bit field, coded as 2 ASCII characters, shall specify the manufacturer Identifier

based on CRIN (Car Radio Identification Number, see ref.[5]).

ASC_1: This 8-bit field, coded as ASCII character shall specify the first character

of manufacturer identifier (A-Z) according to ref.[5].
ASC_2: This 8-bit field, coded as ASCII character shall specify the second
character of manufacturer identifier (A-Z) according ref.[5].
model_number

This 16-bit field, coded as an unsigned binary number, shall specify the model number

based on CRIN ( ref. [5]). This 16-bit binary field represents the 4 digits (decimal) model

number of CRIN.
b ...b decimal model_number
15 0
0000 0000 0000 0000... 0000
0000 0000 0000 0001 0001
... ...
0010 0111 0000 1111 9999
0010 0111 0001 0000 not to be used
... ...
1111 1111 1111 1110 not to be used
1111 1111 1111 1111 not to be used
model_year

This 8-bit field, coded as ASCII character, shall specify the model year based on CRIN

(ref. [5]).
serial_number

This 24-bit field, coded as an unsigned binary number, shall specify the serial number

based on CRIN (ref. [5]). This 24-bit field is the binary representation of the 7 digits

(decimal) serial number of CRIN.
b ...b decimal serial_number
23 0
0000 0000 0000 0000 0000 0000 000 0000
... ...
1001 1000 1001 0110 0111 1111 999 9999
1001 1000 1001 0110 1000 0000 not to be used
... ...
1111 1111 1111 1111 1111 1111 not to be used
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freq_range (freq_table, freq_band, freq_band_flex)

The structure freq_range provides information about which tune/search strategies are

provided by the receiver and which frequencies/frequency bands are supported.
freq_table

This 128 -bit field indicates the predefined frequency tables used for the command

search_for_ensemble.

If the frequency band a frequency table is dedicated to, is not supported completely by

the receiver, then only those frequency table entries are used that are inside the

supported band (the complete ensemble must be inside the supported band).
Bit flag
b0 16 kHz steps
CEPT frequency table for Band III, ref.[7]
CEPT frequency table for L-Band, ref.[7]
b3 Canada frequency table for L-Band
b4-b127 Rfa
The flags shall be coded as follows bi (i=0...127).
0 : Frequency table not supported
1 : Frequency table supported
freq_band
This 16-bit field indicates the supported predefined DAB frequency bands.
Bit flag Frequency band (freq_band)
b0 Band III (174,000 MHz...240,000 MHz)
b1 L-Band (1452,000 MHz...1492,000 MHz)
b2-b15 Rfa
The flags shall be coded as follows bi (i=0...15).
0 : Frequency band not supported
1 : Frequency band supported
freq_band_flex (num_freq_flex, start_freq x, end_freq x, padding)

The structure freq_band_flex provides the possibility for the receiver, to signal

additionally provided DAB frequency bands, which can not be indicated by the
parameter freq_table (see above). If no additional frequency bands are provided,

num_freq_flex shall be set to zero. Freq_band_flex consists of the following fields:

num_freq_flex: This 8-bit field, coded as an unsigned binary number, shall
specify the number of additional bands defined by a list of start and stop
frequencies (maximum 255). The value ‘0’ means that there is no additional
frequency band supported. The start_freq x and the end_freq x fields are not
present in this case.
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start_freq x: This 19-bit field, coded as an unsigned binary number, shall specify

the start frequency (in multiples of 16 kHz) of an additional receiver defined
band x, see ref.[1].
end_freq x: This 19-bit field, coded as an unsigned binary number, shall specify
the end frequency (in multiples of 16 kHz) of an additional receiver defined
band x, see ref.[1].

padding: This variable field of padding bits (set to zero) is used to guarantee a

byte aligned coding. The length of this field is calculated as follows:
number of padding bits = q*8bits - num_freq_flex*2*19bits
0 ≤ number of padding bits < 8
q is an integer value
transmission_mode

This 8-bit field indicates the supported modes. It is possible that not every receiver will

support each transmission mode in each frequency band.
Bit flag
b0 transmission Mode I
b1 transmission Mode II
b2 transmission Mode III
b3 transmission Mode IV
b4-b6 Rfa
b7 automatic mode detection
The flags shall be coded as follows bi (i=0...7).
0 : Mode not supported
1 : Mode supported
max_net_bitrate

This 8-bit field, coded as an unsigned binary number, shall specify the maximum bit rate

(excluding FIC) at the output of the Viterbi decoder in multiples of 8 kbit/s.
max_cu_num

This 10-bit field, coded as unsigned binary number, shall specify the maximum number

of CUs per CIF which can be handled by the receiver.
num_subch

This 6-bit field, coded as an unsigned binary number, shall specify the maximum number

of MSC sub-channels which can be decoded simultaneously.
tii
This 8-bit field indicates the TII support.
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Bit flag
b0 main_id and sub_id
b1 field strength information
b2 carrier information
b3 delay information derived from the TII signal
b4 rough position defined by region Id derived from
TII signal and the FIC information
b5 receiver position defined by longitude and
latitude derived from TII signal and the FIC
information
b6 Rfa
b7 Rfa
The flags shall be coded as follows bi (i=0...5).
0 : TII processing not supported
1 : TII processing supported

This 4-bit field indicates the support of particular sampling frequencies for audio. The

support of 48 kHz sampling frequency is mandatory, if an audio decoder is present.

Bit flag
b0 24 kHz (LSF)
b1 Rfa
b2 Rfa
b3 Rfa
The flags shall be coded as follows bi (i=0,1).
0 : Sampling frequency not supported
1 : Sampling frequency supported
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drc
This 4-bit field indicates the support of dynamic range control.
Bit flag
b0 DRC (using F-PAD, see ref.[1])
b1 DRC (receiver generated)
b2 Rfa
b3 Rfa
The flags shall be coded as follows bi (i=0..3).
0 : not supported
1 : supported
acs
This 8-bit field indicates the supported Access Control Systems (ACS).
Bit flag
b0 NR-MSK [3]
b1 Eurocrypt EN 50094 [4]
b2 Rfa
b3 Rfa
b4 Rfa
b5 Rfa
b6 Rfa
b7 Rfa
The flags shall be coded as follows bi (i=0..7).
0 : Access Control System not supported
1 : Access Control System supported
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pad
This 4-bit field indicates the support of PAD output.
Bit flag
B0 PAD output of the selected audio sub-channel which is sent
to the on board audio decoder
B1 PAD output of any selected audio sub-channel
B2 PAD output of a not selected audio sub-channel
B3 PAD output streams of more than one audio sub-channel in
parallel
The flags shall be coded as follows bi (i=0...3).
0 : not supported
1 : supported
aic
This flag indicates the support of the AIC.
b0 = 0 : receiver is not able to provide the FIGs from the AIC
b0 = 1 : receiver is able to provide the FIGs from the AIC as long as selected
sub-channels do not fully occupy available decoding capacity
audio_info
This 3-bit field indicates the support of audio_info.
Bit flag
B0 audio_info of the selected audio sub-channel which is sent to
the on board audio decoder
B1 audio_info of any selected audio sub-channel
B2 audio_info of a not selected audio sub-channel
The flags shall be coded as follows bi (i=0...2).
0 : not supported
1 : supported
aud_dec
This flag indicates the presence of an audio source decoder.
b0=0 : no audio source decoder present
b0=1 : at least one audio source decoder present
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vid_dec
This flag indicates the presence of an video source decoder.
b0=0 : no video source decoder present
b0=1 : at least one video source decoder present
fig_filtering
This 2 bit field indicates the level of FIG filtering support.
b b
1 0
receiver is not able to perform FIG filtering at all
receiver is able to perform basic FIG filtering by
type/extension
10 receiver is able to perform basic FIG filtering by
type/extension and FIG data field header bits
(C/N, OE, P/D, D1, D2, TCId)
receiver is able to perform advanced FIG
filtering by type/extension, FIG data field
header bits (C/N, OE, P/D, D1, D2, TCId) and
by evaluation of the Service Information
Version (SIV, see in ref.[1])
service_following

This 16-bit field indicates the service following to different broadcast systems. If the

receiver supports the service following to FM or AM then another command set is
needed to control the FM or AM part of the receiver.
Bit flag
b0 DAB ensemble, no local windows
b1 DAB ensemble, with local windows
b2 Rfa
b3 Rfa
b4 FM with RDS
b5 FM without RDS
b6 AM (MW in 9 kHz steps & LW)
b7 AM (MW in 5 kHz steps & SW)
b8..b15 Rfa
The flags shall be coded as follows bi (i=0...15)
0 : service following not supported
1 : service following supported
interface_descriptor (num_i/o, interface x)
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The interface_descriptor list provides information about which interfaces are provided by

the DAB receiver and which protocols are supported on this interface.
num_i/o: This 8-bit field indicates the total number of interfaces (n) which are
supported by the receiver (bi-directional interfaces shall be treated as two
separate interfaces). The value zero is not allowed.
interface x (in/out, I/O_Id, num_protocols, protocol x)
The interface x field provides information about one particular interface.

in/out: This 1-bit flag indicates the direction of the interface. For bi-directional

interfaces the type (I/O_Id) shall be indicated twice for in and for out.
0: output of the receiver
1: input to the receiver
I/O_Id: This 7-bit field, coded as an unsigned binary number, shall specify the
type of interface (I/O Identifier), as described by the following table.
b ...b Physical Interface
6 0
000 0000 not specified (default)
000 0001 Audio speaker
000 0010 Headphone
000 0011 Audio line fixed level
000 0100 Audio line variable level
000 0101 Audio digital (optical)
000 0110 Audio digital (electrical)
000 0111 IEEE1394
000 1000 RF-input
000 1001 Video RGB
000 1010 Video FBAS
000 1011 S-Video
000 1100 RS 232
000 1101 D2B
000 1110 IEEE 1284
000 1111 IEC958
001 0000 SPI
001 0001 2
I C
001 0010 USB
001 0011 IrDA
001 0100 Rfd
... ...
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SIST EN 50320:2001
Page 23
EN 50320:2000
b ...b Physical Interface
...

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