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Content for TS 27.010 Word version: 18.0.0

0… 5… 6… A…

5.1 Service Interface Definition 5.2 Frame Structure 5.3 Frame Types 5.4 Procedures and States 5.5 Convergence Layers 5.6 DLCI Values 5.7 System Parameters 5.8 Start-up and close-down of multiplexer
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5 Non Error Recovery mode Options p. 9

5.1 Service Interface Definition p. 9

5.1.1 Service Definition Model p. 9

5.1.2 Start up services p. 10

5.1.3 DLC establishment services p. 11

5.1.4 Data services p. 12

5.1.5 Power Control services p. 12

5.1.5.1 Sleep services p. 12

5.1.5.2 Wakeup services p. 12

5.1.6 DLC Release services p. 12

5.1.7 Close down services p. 13

5.1.8 Control Services p. 13

5.1.8.1 27.010 Services p. 13

5.1.8.1.1 DLC parameter negotiation p. 13

5.1.8.1.2 DLC Service Negotiation service p. 14

5.1.8.1.3 Test service p. 14

5.1.8.1.4 Flow control services p. 14

5.1.8.2 Port Emulation Services p. 15

5.1.8.2.1 Remote DLC parameter negotiation service p. 15

5.1.8.2.2 DLC Control Parameter service p. 15

5.1.8.2.3 DLC Line status indication service p. 16

5.2 Frame Structure p. 16

5.2.1 Frame Fields p. 16

5.2.1.1 Flag Sequence Field p. 16

5.2.1.2 Address Field p. 16

5.2.1.3 Control Field p. 17

5.2.1.4 Information Field p. 17

5.2.1.5 Length Indicator p. 17

5.2.1.6 Frame Checking Sequence Field (FCS) p. 18

5.2.2 Format Conventions p. 18

5.2.3 Frame Validity p. 19

5.2.4 Frame Abort p. 19

5.2.5 Inter-frame Fill p. 19

5.2.6 Basic Option p. 19

5.2.6.1 Constraint p. 19

5.2.7 Advanced Option p. 20

5.2.7.1 Control-octet transparency p. 20

5.2.7.2 Start/stop transmission - extended transparency p. 20

5.2.7.3 Flow-control transparency p. 20

5.2.7.4 Frame Structure p. 20

5.3 Frame Types p. 21

5.3.1 Set Asynchronous Balanced Mode (SABM) command p. 21

5.3.2 Unnumbered Acknowledgement (UA) response p. 21

5.3.3 Disconnected Mode (DM) response p. 21

5.3.4 Disconnect (DISC) command p. 21

5.3.5 Unnumbered information with header check (UIH) command and response p. 21

5.3.6 Unnumbered Information (UI) command and response p. 22

5.4 Procedures and States p. 22

5.4.1 DLC Establishment p. 22

5.4.2 DLC Release p. 22

5.4.3 Information Transfer p. 22

5.4.3.1 Information Data p. 22

5.4.3.2 Priority p. 23

5.4.4 Frame Variables p. 23

5.4.4.1 Functions of the poll bit p. 23

5.4.4.2 Functions of the final bit p. 24

5.4.5 Time-out considerations p. 24

5.4.6 Multiplexer Control Channel p. 24

5.4.6.1 Message format p. 24

5.4.6.2 Operating procedures p. 25

5.4.6.3 Message Type and Actions p. 25

5.4.6.3.1 DLC parameter negotiation (PN) p. 25

5.4.6.3.2 Power Saving Control (PSC) p. 27

5.4.6.3.3 Multiplexer close down (CLD) p. 27

5.4.6.3.4 Test Command (Test) p. 28

5.4.6.3.5 Flow Control On Command (FCon) p. 28

5.4.6.3.6 Flow Control Off Command (FCoff) p. 28

5.4.6.3.7 Modem Status Command (MSC) p. 28

5.4.6.3.8 Non Supported Command Response (NSC) p. 30

5.4.6.3.9 Remote Port Negotiation Command (RPN) p. 31

5.4.6.3.10 Remote Line Status Command(RLS) p. 34

5.4.6.3.11 Service Negotiation Command (SNC) p. 34

5.4.7 Power Control and Wake-up Mechanisms p. 36

5.4.8 Flow Control p. 37

5.4.8.1 RTR Flow Control p. 37

5.4.8.2 XON/XOFF Flow Control p. 37

5.5 Convergence Layers p. 38

5.5.1 Type 1 - Unstructured Octet Stream p. 38

5.5.2 Type 2 - Unstructured Octet Stream with flow control, break signal handling and transmission of V.24 signal states p. 39

5.5.3 Type 3 - Uninterruptible Framed Data p. 40

5.5.4 Type 4 - Interruptible Framed Data p. 41

5.6 DLCI Values p. 41

5.7 System Parameters p. 42

5.7.1 Acknowledgement Timer (T1) p. 42

5.7.2 Maximum Frame Size (N1) p. 42

5.7.3 Maximum number of retransmissions (N2) p. 42

5.7.4 Window Size (k) p. 42

5.7.5 Response Timer for multiplexer control channel (T2) p. 42

5.7.6 Response Timer for wake-up procedure(T3) p. 42

5.8 Start-up and close-down of multiplexer p. 43

5.8.1 Start-up procedure p. 43

5.8.2 Close-down procedure p. 43