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TS 27.010 (CT3)
Terminal Equipment to User Equipment (TE-UE) multiplexer protocol

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(P) V14.0.0 2017/03 54 p.

(P) V13.0.0 2015/12 54 p.

(P) V12.0.0 2014/10 54 p.

(P) V11.0.0 2012/09 54 p.

(P) V10.0.0 2011/04 54 p.

(P) V9.1.0 2011/01 54 p.

(P) V8.1.0 2011/01 54 p.

(P) V7.0.0 2007/06 54 p.

(P) V6.0.0 2005/01 54 p.

(P) V5.0.0 2002/06 54 p.

(P) V4.2.0 2002/03 54 p.

(P) V3.4.0 2002/03 54 p.

Rapporteur: Mr. Holm, Jan
Antecedent: TS 07.10

The multiplexer protocol described in the present document operates between an UE and a TE and allows a number of simultaneous sessions over a normal serial asynchronous interface. Each session consists of a stream of bytes transferring various kinds of data; for instance, voice, fax, data, SMS, CBS, phonebook maintenance, battery status, GPRS, USSD etc.

This permits, for example, SMS and CBS to be transferred to a TE when a data connection is in progress. Many other combinations are possible including digital voice. It is, for instance, possible to transfer digital voice in combination with SMS. The multiplexer allows a complete system to be partitioned in a flexible way between a UE and TE.

The scope of the present document is to define a multiplexing protocol between a UE and a TE. The multiplexing protocol can be used to send any data, for instance voice, SMS, USSD, fax etc.

This TS describes the protocol, but not the commands or data transported with it.

full Table of Contents for TS 27.010 PDF version: 14.0.0

1 Scope PDF-p. 7

3 Abbreviations

4 Overview of Multiplexing System PDF-p. 8

5 Non Error Recovery mode Options PDF-p. 9

5.1 Service Interface Definition

5.2 Frame Structure

5.3 Frame Types PDF-p. 21

5.3.1 Set Asynchronous Balanced Mode (SABM) command

5.3.2 Unnumbered Acknowledgement (UA) response

5.3.3 Disconnected Mode (DM) response

5.3.4 Disconnect (DISC) command

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

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

5.4 Procedures and States

5.4.1 DLC Establishment

5.4.2 DLC Release

5.4.3 Information Transfer

5.4.3.1 Information Data

5.4.3.2 Priority PDF-p. 23

5.4.4 Frame Variables

5.4.4.1 Functions of the poll bit

5.4.4.2 Functions of the final bit PDF-p. 24

5.4.5 Time-out considerations

5.4.6 Multiplexer Control Channel

5.4.7 Power Control and Wake-up Mechanisms PDF-p. 36

5.4.8 Flow Control PDF-p. 37

5.4.8.1 RTR Flow Control

5.4.8.2 XON/XOFF Flow Control

5.5 Convergence Layers PDF-p. 38

5.5.1 Type 1 - Unstructured Octet Stream

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

5.5.3 Type 3 - Uninterruptible Framed Data PDF-p. 40

5.5.4 Type 4 - Interruptible Framed Data

5.6 DLCI Values PDF-p. 41

5.7 System Parameters

5.7.1 Acknowledgement Timer (T1) PDF-p. 42

5.7.2 Maximum Frame Size (N1)

5.7.3 Maximum number of retransmissions (N2)

5.7.4 Window Size (k)

5.7.5 Response Timer for multiplexer control channel (T2)

5.7.6 Response Timer for wake-up procedure(T3)

5.8 Start-up and close-down of multiplexer

5.8.1 Start-up procedure

5.8.2 Close-down procedure PDF-p. 43

6 Error Recovery Mode Option

6.1 Frame Types

6.1.1 Information transfer, I, command and response

6.1.2 Receive ready, RR, command and response

6.1.3 Receive not ready, RNR, command and response PDF-p. 44

6.1.4 Reject, REJ, command and response

6.2 Procedure and State

A Advice to TE software implementers PDF-p. 48

B Explanatory notes on the CRC Calculation PDF-p. 49

B.2 Reflected bits

B.3 Implementation PDF-p. 50

B.3.1 Calculate FCS for the example given earlier

B.3.2 Check FCS for the example given earlier

B.3.3 The transmitter code

B.3.4 The receiver code

B.3.5 Reversed CRC table PDF-p. 51

C Change History PDF-p. 52