Siemens Mux_guide_v06 사용자 설명서

Siemens

Multiplexer User's Guide
Confidential / Released

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Mux_guide_v06

Page 3 of 36

30.06.2004

Contents

Document history..........................................................................................................5

Introduction ...................................................................................................................6

Supported products and related documents..........................................................7

References ............................................................................................................7

Term and abbreviations .........................................................................................8

Multiplexer protocol – an overview .............................................................................9

Product concept and architecture ..........................................................................9

Virtual channels and AT commands ....................................................................10

Integrating multiplexer into the customer application ............................................11

Characteristics .....................................................................................................11

Basic requirements ................................................................................11

Restrictions ............................................................................................11

Dependencies between multiplexer channels and restrictions of use ...12

Functions without channel dependencies..............................................12

Timing conditions ...................................................................................13

Operation of a second physical serial interface ASC1 (if applicable) ....13

Multiplexer control and signaling lines .................................................................14

Flow control............................................................................................14

Escape sequence ..................................................................................16

Power saving .......................................................................................................16

Bandwidth of logical channels .............................................................................16

Structure of the multiplexer protocol........................................................................17

Introduction of the multiplexer protocol................................................................17

Data link layer ......................................................................................................17

Flag sequence .......................................................................................18

Address field ..........................................................................................18

Control field............................................................................................19

Length indicator .....................................................................................20

Information field .....................................................................................20

Frame checking sequence field (FCS)...................................................20

State diagrams.....................................................................................................21

Start-up procedure .................................................................................25

DLC establishment.................................................................................25

Information transfer................................................................................25

DLC release ...........................................................................................26

Close-down procedure...........................................................................26

Multiplexer control channel ....................................................................26

Multiplexer close down (CLD) ................................................................27

Test command (Test).............................................................................27

Modem status command (MSC) ............................................................28

Power saving control (PSC)...................................................................30

Non-supported command response (NSC)............................................31

Example: Establishing logical channels without parameter negotiation ..............32