SIM5360 Multiplexer User Manual Application Note - MT
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1. 2 5 1 PSC Message type coding octet Hex value is 0x43 Command 0x41 Response TE sends a PSC event frame to MS MS feeds back a PSC respone frame to confirm SIM5360 Multiplexer User Manual Application Note V0 01 12 2014 3 26 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech The length field in PSC message frame 1s 0 It has no value octet 2 5 2 CLD Message type coding octet Hex value is 0xC3 Command OxC1 Response The length field in CLD message frame is 0 It has no value octet 2 5 3 Test Message type coding octet Hex value is 0x23 Command 0x21 Response The test command is used to test the connection between MS and the TE The length byte describes the number of value bytes which are used as a verification pattern The opposite entity shall respond with exactly the same value bytes 2 5 4 MSC MSC message frame is designed to convey virtual V 24 control signals Message format 1s DLCI V 24 control signals Break signals Optional Message type coding octet Hex value is 0xE3 Command 0xE1 Response V 24 control signals format is reserved 0 reserved 0 Break signals is set to 0x01 2 5 5 FCoff Message type coding octet 1s Hex value is 0x63 Command 0x61 Response The length byte contains the value 0 and there are no value octets 2 5 6 FCon SIM5360 Multiplexer User Manual Application Note V0 01 13 2014 3 26 SIM5360 Mult2. m SIM Tech A O 2 A 0000 EO ic ompany SIM5360 Multiplexer User Manual Application Note Application Note SIM5360 Multiplexer User Manual Application Note A company of SIM Tech General Notes SIMCom offers this information as a service to its customers to support application and engineering efforts that use the products designed by SIMCom The information provided is based upon requirements specifically provided to SIMCom by the customers SIMCom has not undertaken any independent search for additional relevant information including any information that may be in the customer s possession Furthermore system validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customer s system integrator All specifications supplied herein are subject to change Copyright This document contains proprietary technical information which is the property of SIMCom Limited copying of this document and giving it to others and the using or communication of the contents thereof are forbidden without express authority Offenders are liable to the payment of damages All rights reserved in the event of grant of a patent or the registration of a utility model or design All specification supplied herein are subject to change without notice at any time Copyright Shanghai SIMCom Wireless Solutions Ltd 2014 SIM5360 Multiplexer User Manual Application Not
3. 4D 39 30 30 20 52 31 31 2E 30 OD OA FF F9 F9 05 EF 0C 00 OD OA 4F 4B OD 04 4A F9 TE sends AT F9 09 EF 07 41 54 OD 35 F9 command AT lt CR gt MS feeds F9 09 EF 06 00 61 74 OD EF F9 F9 09 EF back through 0C 00 OD OA 4F 4B OD OA DF F9 SIM5360 Multiplexer User Manual Application Note V0 01 2014 3 26 UIH Frame UIH Frame UIH Frame UIH Frame 20 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 3 3 Flow Control Data Hex Comment TE lt gt M F9 01 EF OB E3 Note 1 07 07 8F 0179 F9 F9 01 EF OB E3 07 07 8D 01 79 F9 MS sends MSC message with FC bit set to 1 through control channel DLC 0 to indicate refusing to accept anything on DLC 1 MS sends MSC message with FC bit set to 0 through control channel DLC 0 to indicate recovery of DLC 1 data transmission F9 01 EF OB E3 07 07 8D 01 79 F9 TE sends MSC message with FC bit set to 0 through control channel DLC 0 to indicate recovery of DLC 1 data transmission F9 01 EF 05 63 01 93 F9 TE sends FCoff message through DLC 0 to indicate refusing to accept anything on all DLC except DLC 0 TE sends FCon message through DLC 0 to indicate recovery of data F9 01 EF 05 A3 0193 F9 transmission TE sends MSC message with FC bit set gt F9 01 EF OB E3 to 1 07 07 8F 01 79 F9 through control channel DLC 0 to indicate refusing to accept anything on DLC 1 Note 1 The FC bit of 8F is set to 1 to indicate data is unable
4. Closing Down Multiplexers 2 0 0 0 cccccsecsssseeeccceeeeeeeeeeeeaaseeeeeseeeeeeeeeeeeeeeeeaaaas 24 SIM5360 Multiplexer User Manual Application Note V0 01 3 2014 3 26 SIM5 3 60 Multiplexer User Manual Application Note A company of SIM Tech Version History SIM5360 Multiplexer User Manual Application Note V0 01 4 2014 3 26 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech Abbreviations DLC Data Link Connection DLCI Data Link Connection Identifier RLS Remote Line Status Command SABM Set Asynchronous Balanced Mode UA Unnumbered Acknowledgement DM Disconnected Mode DISC Disconnect DISC command UIH Unnumbered information with header check UIH command and response UI Unnumbered Information command and response PSC Power Saving Control CLD Multiplexer Close Down MSC Modem Status Command TE Terminal Equipment MS Mobile Station FC Flow Control RTC Ready To Communicate RTR Ready To Receive IC Incoming Call Indicator DV Data Valid PN Parameter Negotiation FCon Flow Control On Command FCoff Flow Control Off Command NSC Non Support Command RPN Remote Port Negotiation RLS Remote Line Status Command SNC Service Negotiation Command TE Terminal Equipment MS Mobile Station SIM5360 Multiplexer User Manual Application Note V0 01 5 2014 3 26 a Com SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 1 Introduction The present do
5. frame type is six The control fields of the frames used in the present document are described in the following table SIM5360 Multiplexer User Manual Application Note V0 01 8 2014 3 26 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech HEX 1 Frame Type Comment Set Asynchronous Balanced Mode Ox2F SABM Unnumbered 0x63 UA Acknowledgement OxOF DM Disconnected Mode 0x43 Disconnect Unnumbered OxEF Information with Header check Unnumbered Information Optional Note 1 Hex value does not count the bit 5 value 2 1 4 Length Field Refer to as follow table The L1 to L7 bits indicates the length of the following data field The range of the length field may be extended by use of the EA bit When the EA bit is set to 1 in an octet it is signifies that this octet is the last octet of the length field When the EA bit is set to 0 it signifies that a second octet of the length field follows SIMCOM multiplexer only supports EA is I one byte Note Length field should always be contained in each frame even though information field is empty 2 1 5 Information Fields The information field is the payload of frame and carries the user data information e g AT Command and PPP data packet The field is octet structured The information field is only present in UIH frames SIM5360 Multiplexer User Manual Application Note V0 01 9 2014
6. 3 26 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 2 2 Frame Type 2 2 1 SABM SABM is command frame and shall be used to establish DLC between TE and MS Please refer to 3 1 for more details 2 2 2 UA UA frame 1s the response to SABM or DISC frame Please see following diagram and refer to 3 1 and 3 6 for more details SABM Set up DLC 1 SIMCOM Client DISC Close DLC 1 Multiplexer i Receiver UA Response 2 2 3 DISC DISC is command frame and shall be used to close down DLC Prior to acting the command the receiving station shall confirm the acceptance of the DISC command by the transmission of a UA response Please see the diagram above and refer to 3 6 for more details 2 2 4 DM The DM response frame shall be used to report a status that DLC 1s already closed down Please refer to 3 1 for more details 2 2 5 UIH The UIH frame shall be used to send user data it is command frame or respone frame Please refer to 3 2 for more details SIM5360 Multiplexer User Manual Application Note V0 01 10 2014 3 26 SIM5360 Multiplexer User Manual Application Note 2 2 6 UI Not support SIM5360 Multiplexer User Manual Application Note V0 01 2014 3 26 A company of SIM Tech RE Com SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 2 3 DLC Establishment TE establishs a DLC by sending a SABM frame to MS with the P bit set to 1 The address field contai
7. bsaientosadvapenteasasdsandcuracees 12 2 4 Closing Down DLC esis scans sashctstera tren EA uses Ea sasahadaSernsnes Sa 12 23s Controlehanne ne ne ee Tn ee de eee Ten EO e 12 Doda ESC sas eee Re eee eee eee eee ee eee eee 12 pa LLED Renee renee ee eee E ee ee 13 Zid DESC iss sts cere Re asses ee ee ea a E E E au std teenies 13 pA bel Gta ne ener ne etree een ee tree erent etree RR eee ren rt se 13 LS FCO eee ee OR ee ee ee entre ene eee ener 13 2 5 6 OW ERROR E EE E E essere RIOT ON E I E E RR 13 2 5 7 PN NSC RPN RLS SNC sessao ee eee 14 2o DanC Dn seca cote ses sats tne tsetse Dida bn seis sds bse Sia sate 15 2 7 About Flow Control cc cc cccccccccecccccceeeeeessseseeeeccceeeeeeausaaeaassssseeeeeeceeeeeeeeeaaags 16 2 8 Samples for Frame Structure cc cccscccsesssseeccceeeeeeeeeeeeaaeesesseseeeeeeeeeeeeeenaaas 17 2 9 Transmission bit sequence cc ccccssseeeeseseeeceeceeeeeeeeeeeaeaseeessseeeeeeeeeeeeeeeeaaaas 17 do JEXAMDIOS somas een ene eee et ee ee ere ee one ee eee eee rene ene err Te 18 3 1 Establish Channels 0 cccccccccccccccsssssesseseseeeeccceeeeeeeseeeeaasseeseseeeeeeeeeeeeeeeeeaaas 18 3 2 Frame Transmission sisccscsiccscsccccccasssasccsnstivccscadcesandaesesasaadsasacidsceescadvesenieasesdsatsdeiacdes 20 dd Flow CONTROL esl tote Sead tc a Gab da a a 21 3 4 Dealing with the wrong frame ce cccccccsceecccceeeeeeeeeesaaaseeeesseseeceeeeeeeeeeeeaaaas 23 3 5
8. cument describes the SIMCOM multiplexer protocol and the technical details of how to make use of it 1 1 SIMCOM Multiplexer Design Purpose A device using GPRS or GSM data may wish to receive and transmit multiple streams of data simultaneously These are Command data AT commands GPRS data and GSM circuit switched data CSD These streams are essentially independent to one another As to the non multiplexer device it is so inefficient to deal with only one kind or one channel of data steam during a period of time Therefore SIMCOM multiplexer is designed with GSM0710 standard to separate transmission device layer into several logic channels DLC in order to transmit data simultaneously Each channel has its own buffer management and flow control mechanism 1 2 Architecture Diagram SIMCOM multiplexer architecture diagram is as following Transmission Device Layer Transmission Device Layer Serial Pot Port Client Application SIMCOM Multiplexer is established upon system transmission device layer Commonly serial port Data streams are addressed with DLCI value and encapsulated in frames based on GSM 0710 protocol Chapter 2 SIMCOM Multiplexer Protocol and transmitted through interface provided by transmission device layer SIM5360 Multiplexer User Manual Application Note V0 01 6 2014 3 26 SIM5360 Multiplexer User Manual Application Note company f SIM Tec 1 3 Restrictions e DC1 XON and DC3 XOFF flow control is n
9. e V0 01 2 2014 3 26 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech Content VR STN ESOT a E dia E ao o sa paes ig eaenaaeciosass 4 Ms RMU tsa sss erence eds asses O a ad 6 1 1 SIMCOM Multiplexer Design Purpose cc cccccecceeeeeceeeeeeeeeeeeeaaaeeeeeeeees 6 1 2 Architecture Diagram 0 0 0 0 cccceceeceeceecceceeeeeeeeaaaeeeeeseseeceeeeeeeeeeeseauaaasaeseseeeeeees 6 MB PROSE UNC UNOS pagas cease E E 7 kA Reens eee a a aa a a 7 2 SIMCOM Multiplexer Protocol 0000000000aennnennnnnnnnnnssssssssssseeerrssssssssssssssssseereeessssssssssssses 8 2 1 Transmission Frame Structures 0cccccccccccccccscsceeccccceeeeeeeeeeaeeeesesseeeeeeeeeeeeeeeeeeaaas 8 2 1 1 Opening and Closing Flag Field ccc ccccccccccccccceeeeeeeeeaeeseesssseeeeeeeeees 8 2 1 2 Address Ficidae ED AD OR OR 8 pi Control Field ass 055520 aes he pas ada picasa eas as Gao dasa edad dada Dana dada asa Saia Es aa ado 8 2 1 4 EES oh Col Co PEEN E tener tty RREO TAE O DR 9 2 1 5 Information PICOS sa aass saio ses ssa nas Raia a RES ra 9 22 BRA VN san cassar seat tao E tanateseontsamsan neces 10 2 2 1 SABNE R 10 DZ VANNER eee ee eee ee eee ee 10 22o O DISC en ete ne N ee 10 22d O DME eee Tn E Eee er A 10 22S U1 fl eee a ee nee Sao De SEG Sa ee Sa en ee een ee 10 ZON ee eee Reno RE ere ee ERG a t Es asUnoR ERG REra SAE nro ene eee eee ee 11 2 3 DLC ESCA on ccccsscsccsscotsscncssnscsistetensecscsdcevanteesavisapdceeas
10. ept TE sends DISC frame to request closing down DLC 3 MS feeds back UA frame to accept TE sends DISC frame to request closing down DLC 4 MS feeds back UA frame to accept TE sends CLD message frame to F9 03 EF 05 C3 01 F2 F9 E q RR gt E gt E q gt lt request closing down multiplexer through DLC 0 MS feeds back CLD response to lt F9 01 EF 04 00 C101 By now closing down procedure a SIM5360 Multiplexer User Manual Application Note V0 01 24 2014 3 26 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech Contact us Shanghai SIMCom Wireless Solutions Ltd Add Building A SIM Technology Building No 633 Jinzhong Road Changning District Shanghai P R China 200335 Tel 86 21 3252 3300 Fax 86 21 3252 3301 URL www sim com wm SIM5360 Multiplexer User Manual Application Note V0 01 2 2014 3 26
11. equests to establish gt Krn 07 3F 01 DE F9 DLCII using SABM frame MS feeds back UA frame lt F9 07 73 00 00 D7 F9 for receiving frames MS feeds back MSC F9 01 EF 0A 00 E1 05 07 response 0D 01 96 F9 MS feeds back MSC F9 01 EF 0A 00 E1 05 07 TE sends MSC message F9 01 EF OB E3 07 0B OD MS feeds back MSC F9 01 EF 0A 00 E1 05 07 Establishment of DLC 3 4 By now 4 channels have come into existence Multiplexer can work normally This command is used in order to determine which mode is used of MS Multiplexer TE sends MSC message F9 01 EF OB E3 07 07 0D a E 3 TE requests to establish F9 0B 3F 01 59 F9 DLCI2 using SABM frame MS feeds back UA frame F9 0B 73 00 00 42 F9 Note 1 1 MS is using Standard Multiplexer mode 1f responds with DM frame 2 MS is using Embedded Multiplexer mode 1f responds with UA frame Here is Standard Multiplexer mode Note 2 SIMCOM multiplexer only supports standard multiplexing mode so MS feeds back DM frame F9 27 73 00 00 CD F9 SIM5360 Multiplexer User Manual Application Note V0 01 19 2014 3 26 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 3 2 Frame Transmission After establishment of control channel and data channels TE and MS can transmit data through UIH frames between each other TE sends AT F9 05 EF 09 41 54 49 0D 58 F9 command ATI lt CR gt through DLC MS feeds F9 05 EF 08 00 41 54 49 OB 3F F9 F9 back through 05 EF 20 00 0D 0A 53 49
12. f buffer and flow control All information transmitted between the TE and MS 1s conveyed in frames 2 1 Transmission Frame Structures The frame structure is composed of an opening and a closing flag an address field a control field a Length field an information field and FCS field Please see following table Opening Address Control Length Information FCS Closing Flag Field Field Field Field Field Flag 2 1 1 Opening and Closing Flag Field Each frame begins and ends with a flag sequence octet which is defined as a constant bit pattern OxF9 2 1 2 Address Field The address field consists of a single octet It contains the Data Link Connection Identifier DLCI the C R bit and the address field extension bit EA as following table EA bit According to ISO IEC 13239 1997 the range of the address field may be extended by use of the EA bit When the EA bit is set to 1 in an octet it signifies that this octet is the last octet of the address field When the EA bit is set to O it signifies that another octet of the address field follows SIMCOM multiplexer only supports one address octet so the EA bit is always set to 1 C R bit The C R command response bit identifies the frame as either a command or a response DLCI bit Total bits is six indicates logical channel number The channel number value range is 0 63 2 1 3 Control Field The content of the control field defines the type of frame Refer to 2 2 frame type The
13. iplexer User Manual Application Note A company of SIM Tech Message type coding octet is Hex value is 0xA3 Command OxA1 Response The length byte contains the value 0 and there are no value octets 2 5 7 PN NSC RPN RLS SNC Not Supported SIM5360 Multiplexer User Manual Application Note V0 01 14 2014 3 26 0000 0000 D Soe o Com SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 2 6 Data Channel Data channels shall be used to transmit user data streams such as AT command data GPRS data and GSM CSD data streams SIM5360 Multiplexer User Manual Application Note V0 01 15 2014 3 26 RE Com SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 2 7 About Flow Control SIMCOM multiplexer supports software flow control and can not perform hardware flow control mechanism Software flow control is implemented by GSM 0710 MSC FCoff and FCon message frame MS will send MSC message to TE with FC bit set to 1 in V 24 control signals when refuse to accept frames Whereas set to 0 to inform recovery of receiving frames TE will send MSC message to MS with FC bit set to 1 in V 24 control signals when refuses to accept frames Whereas set to 0 to inform recovery of receiving frames When receiving MSC MS will feed back MSC response to indicate recover data transmission TE also can send Fcoff message to MS when refuses accept anything except control messages on DLC 0 After
14. ns the DLCI value associated with the desired connection If MS is ready to establish the connection it will reply with a UA frame with the F bit set to 1 If MS is not ready or unwilling to establish the particular DLC it will reply with a DM frame with the F bit set to 1 Please refer to 3 1 for more details 2 4 Closing Down DLC The release of a DLC will be initiated from by the transmission of a DISC frame with the P bit set to 1 Confirmation of the DLC release is signaled by MS sending a UA frame with the F bit set to 1 Once the DLC has been released the MS enter disconnected mode for that particular DLC If MS receiving the DISC command is already in a disconnected mode it will send a DM response Please refer to 3 6 for more details 2 5 Control channel Multiplexer control channel is the basic channel which is used to establish DLC launch power saving wake up from power saving and implement flow control mechanism Control channel is the first channel established at the initiation of the multiplexer and it has the DLCI value 0 UIH message frame is transmitted through control channel All UIH message frame conform to the following format type Length vet vae men o Type field octet has the following format T1 T6 is the type coding of information command Please refer 2 5 1 to 2 5 6 fore more details The length field octet has the following structure The message frame is divided into following types
15. nsmission order starting from bit 1 the first tr ansmission low bit SIM5360 Multiplexer User Manual Application Note V0 01 17 2014 3 26 SIM5360 Multiplexer User Manual Application Note 3 Examples 3 1 Establish Channels Step 1 Launch Multiplexer TE launches MS multiplexer function by AT command MS feed back response MS changes MS multiplexe function state feeding back respone 61 74 2B 63 6D 75 78 3D 30 0D OD OA 4F 4B OD 0A OD 0A 61 74 2B 63 6D 75 78 3D 30 OD OD OA 4F 4B OD 0A OD 0A 41542b434d55583d300d Od0a4f4b0d0a The four frame head flag commands transmission has two roles A company of SIM Tech AT CMUX 0 lt CR gt lt LF gt AT CMUX 0 lt CR gt lt LF gt OK lt CR gt lt LF gt lt CR gt lt LF Notel After receive ok host need quickly send the establish DLCO frame otherwise the client will exit MUX state 1 Indicates he MS terminal MUX state initialization is completed 2 Synchronous after TE or MS data out of step Here is to play arole of 1 Step 2 Establish DLC 0 TE requests to Establishes control channel DLCI 0 using SABM frame MS feeds back UA for receiving SABM and accepts to create DLCI 0 F9 03 3F 01 1C F9 F9 03 73 00 00 A4 F9 SIM5360 Multiplexer User Manual Application Note V0 01 2014 3 26 SABM Frame UA Frame ee a Ea Com SIM5 360 Multiplexer T A company of SIM Tech a Establish DLC 1 Step Data Hex Comment Direction hare TE r
16. ot supported O Error Recovery Mode is not supported o PN NSC RPN RLS SNC message frames are not supported All the system parameters defined in GSM 0710 are set to default as following table The max length is 255 T1 100 milliseconds Time that a station will wait for Acknowledgement Timer an acknowledgement before resorting to other action NI Maximum number of octets that Maximum Frame Size may be contained in an information field N2 Maximum number of retransmissions T2 300 milliseconds Not used Response Timer for multiplexer control channel T3 10 seconds Amount of time the transmitting Response Timer for wake up station of a power wake up procedure command waits before raising an alarm when no response is received K N A Not used Window Size UI Frames are not supported O Only supports GSM 0710 Basic Option 1 4 References v Digital cellular telecommunications system Phase 2 Terminal Equipment to Mobile Station TE MS multiplexer protocol GSM 07 10 version 7 1 0 Release 1998 SIMCOM AT Commands Set SIM5360 ATC V0 08 SIM5360 Multiplexer User Manual Application Note V0 01 7 2014 3 26 RE Com SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 2 SIMCOM Multiplexer Protocol SIMCOM Miultiplexer protocol provides a data transmission mechanism by establishing DLC between TE and MS Several DLC can be set up Each one is independent to one another and has its own management o
17. this MS will stop sending any frames through all the data channels except control channels Control channel is still alive and free to send any control message Whereas sends FCon to recover transmission When receiving Fcoff or FCon message MS will feed back Fcoff or FCon response The difference between MSC and Fcon Fcoff is that the former only flow controls one of the data channels and the latter controls all the data channels except controls channel Please refer to 3 4 for more details SIM5360 Multiplexer User Manual Application Note V0 01 16 2014 3 26 a Com SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 2 8 Samples for Frame Structure a a l F5 O RC gt E eS Control Field Length Field Closing Flag Field mae saamme ooien ME filed This sample is a SABM frame to open DLCI 0 Sample 2 Co o asso s r Opening Address Control an Information TT kakiki el ee Header DLC 1 AT Command Tail This sample is a UIH frame to transmit AT command ATI lt CR gt Sample 3 pe oa fe p Opening Address Control Length Information a Flag Field Field Field Field Flag Header DLC 0 MSC Message Tail Frame length 3 This sample is a MSC message carried in UIH frame to transmit V2 4 signal 0x0D 2 9 Transmission bit sequence Transmission is based on 1 start bit 8 data bits 1 stop bit and no parity All the above mentioned frames format tra
18. to receive Note 2 The FC bit of 8F is set to O to indicate recovery of receiving data Note 3 TE side controls all channels except DLC 0 SIM5360 Multiplexer User Manual Application Note V0 01 21 2014 3 26 SIM5360 Multiplexer User Manual Application Note SIM5360 Multiplexer User Manual Application Note V0 01 2014 3 26 A company of SIM Tech 22 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 3 4 Dealing with the wrong frame After successful establishment of data channels Data transmission between TE and MS 1s normal TE tests AT command F9 05 EF 07 41 54 0D 06 transmission through DLC 1 F9 after re sync MS feeds back response F9 05 EF 07 41 54 0D 67 F9 F9 25 EF 0D 0D 0A 4F 4B 0D 0A 8A F9 Note 1 Sending illegal hex byte will lead MS to receive a wrong frame Note 2 When receiving illegal hex byte between frames MS will just throw it away automatically and wait for the next frame If next Frame is legal the Multiplexer will handle it and MS will give you a right response If not the Multiplexer will still throw it away and wait for the next frame SIM5360 Multiplexer User Manual Application Note V0 01 23 2014 3 26 SIM5360 Multiplexer User Manual Application Note A company of SIM Tech 3 5 Closing Down Multiplexers TE sends DISC frame to request closing down DLC 1 MS feeds back UA frame to accept TE sends DISC frame to request closing down DLC 2 MS feeds back UA frame to acc
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