Huawei 目录 (Contents) Module CMUX Application Guide (V100R001 04, English)

HUAWEI Module CMUX Application Guide-(V100R001_04, English)

2015-08-20

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HUAWEI Module

CMUX Application Guide

Issue

Date

2015-08-14

Copyright © Huawei Technologies Co., Ltd. 2015. All rights reserved.
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HUAWEI Module
CMUX Application Guide

About This Document

About This Document
Revision History
Document
Version

Date

2014-11-04

2014-11-26

Added the description of the
MU709 module

2015-04-23

Updated the scope

2015-08-14

Added the description of the
ME909s series module

Chapter

Descriptions
Creation

2.1
2.2
6.1
6.2
6.3
8

Scope
Huawei Module

Firmware Version

MU509-b

13.815.07.00.00 or latter

MU709s-2

11.651.66.01.00 or latter

MU709s-6

11.651.66.01.00 or latter

ME209u-526

11.535.11.00.00 or latter

ME909s-821

11.613.01.00.00 or latter

ME909s-120

11.613.01.00.00 or latter

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Contents

Contents
1 Introduction.................................................................................................................................... 6
1.1 Audience ........................................................................................................................................... 6
1.2 Related Documents .......................................................................................................................... 6

2 Overview......................................................................................................................................... 7
2.1 Implementation Features ................................................................................................................. 7
2.2 Key Highlights of Huawei CMUX Application ................................................................................... 8

3 Serial Multiplexer Protocol ......................................................................................................... 9
3.1 CMUX Frames Structures ................................................................................................................ 9
3.1.1 Flag Field ................................................................................................................................. 9
3.1.2 Address Field ........................................................................................................................... 9
3.1.3 Control Field .......................................................................................................................... 10
3.1.4 Information Field .....................................................................................................................11
3.1.5 Length Indicator ......................................................................................................................11
3.1.6 Frame Check Sequence ........................................................................................................ 12
3.2 UIH Control Channel Frame Coding .............................................................................................. 12
3.2.1 Multiplexer Close Down ......................................................................................................... 12
3.2.2 DLCI Parameter Negotiation ................................................................................................. 13
3.2.3 Non Supported Command Response (NSC) ........................................................................ 13
3.2.4 Modem Status Command (MSC) .......................................................................................... 13
3.2.5 Flow Control On Command (FCon)....................................................................................... 14
3.2.6 Flow Control Off Command (FCoff) ....................................................................................... 15
3.2.7 Power Saving Command (PSC) ............................................................................................ 15
3.2.8 Service Negotiation Command (SNC)................................................................................... 15
3.3 UIH Data Channel Frame Coding .................................................................................................. 16

4 CMUX Functional Description ................................................................................................. 17
4.1 Establish CMUX Session ............................................................................................................... 18
4.2 Create Virtual COM Port ................................................................................................................ 18
4.3 Create DLCI ................................................................................................................................... 18
4.4 Send Data ...................................................................................................................................... 19
4.5 Disable MUX .................................................................................................................................. 19

5 Installation Procedures and Requirements ............................................................................ 22

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5.1 Install HuaweiCMUXInstaller .......................................................................................................... 22
5.2 Create Virtual COM Ports............................................................................................................... 26

6 Guide of Huawei CMUX Application .................................................................................... 30
6.1 CMUX Application Main Window.................................................................................................... 30
6.1.1 N1, N2 and T2 ....................................................................................................................... 31
6.1.2 Baud Rates ............................................................................................................................ 31
6.1.3 Help Button ............................................................................................................................ 32
6.1.4 Enable and Disable MUX ...................................................................................................... 32
6.2 DLCI Main Window......................................................................................................................... 34
6.3 Advanced Main Window ................................................................................................................. 37
6.3.1 Create DLCI from Advanced Window.................................................................................... 37
6.3.2 Delete DLCI from Advanced Window .................................................................................... 39
6.3.3 Send Test Commands from Advanced Window .................................................................... 40
6.3.4 Close down the CMUX from Advanced Window ................................................................... 41
6.4 AT/Raw Main Window .................................................................................................................... 41
6.5 Statistics Application Main Window ................................................................................................ 42
6.6 Log Window.................................................................................................................................... 42

7 How to Use Windows Dialer .................................................................................................... 44
7.1 Create the Virtual Ports .................................................................................................................. 44
7.2 Disconnect the Hyper Terminal ...................................................................................................... 51

8 Summary and Recommendations ............................................................................................ 55
9 FAQ ................................................................................................................................................ 57
10 Abbreviations ............................................................................................................................ 60

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Introduction

This document provides readers with necessary information to develop a multiplexing
protocol running on their equipment in order to use the CMUX function provided by
Huawei modules.

1.1 Audience
This guide is intended for users or integrators interested to implement a multiplexing
protocol running on Huawei module.

1.2 Related Documents
3GPP TS 27.010 V11.0.0 (2012‐09), Release 11

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Overview

CMUX Library (also referred as CMUX module) is an implementation of the standard
3GPP TS 27.010 V11.0.0 (2012-09). CMUX module along with a serial port emulation
module helps providing service to several applications to use their own respective
virtual ports, but in essence all data will converge and be transmitted over only one
physical serial port. This is very useful in scenarios where there are several
applications which intend to use more than one serial port interface, such as SMS,
GPRS, voice and GSM, while only one physical port is available to communicate with
the Target-platform.
Figure 2-1 General architecture

As shown in Figure 2-1 , CMUX library provides facility for several serial
transmissions between TE (the host) and UE (the target) over a single start-stop
framed and serial link.

2.1 Implementation Features
Huawei CMUX implementation features currently support the following:


Operating option: Basic mode



SABM, DISC, MSC, FCON, FCOFF, DLCPN, TEST_CMD, CLD and UIH frames
are supported



DLCI 0 is control Data Link Connection Identifier (DLCI).

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Overview



The MU509-b, MU709s series, ME209u-526 and ME909s series module support
four DLCIs (DLCI 1, DLCI 2, DLCI 3 and DLCI 4), and all four DLCIs are AT
DLCIs. Only the ME909s series module supports DLCI 5 for eCall AT command.



User configurable MUX settings



DLCI PN can be sent but it is not user configurable.

2.2 Key Highlights of Huawei CMUX Application


Detailed Log Window: Log window of the application provides details of the
control frames sent and received in Hex and ASCII format and user
understandable format leading to:
−

Easier debugging and implementation

−

Easier understanding of CMUX protocol



Quick & Advanced DLCI Creation: DLCI creation can be quickly done through
normal DLCI window. Also, application also provides flexibility to send the
desired control frames and create DLCI.



Configurable MUX Parameters: MUX parameters such as baud rate, response
timer (T2) and retransmission number (N2) can be configured by the user.

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−

Baud rates supported are 3000000 bit/s, 1000000 bit/s, 921600 bit/s, 460800
bit/s, 230400 bit/s, 115200 bit/s, 57600 bit/s, 38400 bit/s, 19200 bit/s and
9600 bit/s (The 921600 bit/s and 460800 bit/s are for MU509-b, MU709s
series and ME209u-526 module; the 3000000 bit/s and 1000000 bit/s are
only for ME909s series module).

−

Response time can be 100 ms to 2.5s. Default value is 900 ms.

−

The stepping time for the response time is 1 ms.

−

Retransmission number can be 0 to 10. Default value is 3.

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Serial Multiplexer Protocol

This chapter introduces the CMUX protocol and its frame structures.

3.1 CMUX Frames Structures
All the information transmitted between the Huawei module and applications is based
on frames that have the following structure.
Figure 3-1 Frame structure for basic option

MAX FRAME LENGTH supported is 1540.
The frame structure is composed of an opening and a closing flag, an Address field,
a Control field, an Information field and Frame Check Sequence (FCS) field. A length
indication field is present in each frame if no transparency mechanism is used for the
multiplexing session.

3.1.1 Flag Field
Each frame begins and ends with a flag sequence octet which is defined as a
constant bit pattern (0xF9 in Hexadecimal format).

3.1.2 Address Field
The address field consists of a single octet. It contains EA bit, C/R bit and DLCI as
shown in Table 3-1 .

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Table 3-1 Format of Address Field
Bit No.



C/R

DLCI

EA: It refers extension field. 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 0, it signifies that another octet of the address field
follows.

C/R: It is a command or a response bit. It is used to identify whether a frame is a
command or a response. If the application or module sends a command, C/R bit
is set to 1; and in case of response, the C/R bit is set to 0. In Huawei CMUX
implementation, the initiator is always the application. The table below
summarizes the concept.

Initiator

Responder

C/R value

Command/Response

Application

Module

Command

Application

Module

Response

Application

Module

Command

Application

Module

Response



Direction

DLCI: Data Link Connection Identifier. It is used to identify an individual user
information stream as well as to identify connections between TE (the host) and
UE (the target). Multiple DLCIs shall be supported but the number is
implementation-specific.

3.1.3 Control Field
The content of the control field defines the type of frame. The control fields of the
frames used are described in the table below.
Frame
Type

Control Octet
1

SABM

P/F

DISC

P/F

UIH

P/F



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P/F stands for Poll/Final bit.

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

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SABM (Set Asynchronous Balance Mode)
SABM command shall be send by the TE (the host) to the UE (the target) to
confirm the acceptance of SABM by transmission of UA response.



UA (Unnumbered Acknowledge)
The UA response is sent by the module as an acknowledgement that a SABM or
DISC command was accepted.



DM (Disconnected Mode)
In case if the module rejects SABM or DISC command, it will send DM response.
For example, if SABM is sent for a DLCI not supported or if a DISC is sent to
DLCI address already closed, this frame will be send.



DISC (Disconnect)
The DISC is used to close a previously established connection. If the application
sends a DISC for the DLCI 1 and DLCI 1 is already established, then it will be
closed. The module will answer to this command with an UA frame.



UIH (Unnumbered Information with Header check)
The UIH command/response will be used to send information. For the UIH frame,
the FCS will be calculated over only the address, control and length fields. There
is no specified response to the UIH command/response.



UI (Unnumbered Information)
The UI command/response will be used to send information. There is no
specified response to the UI command/response. For the UI frame, the FCS
shall be calculated over all fields (Address, Control, Length Indicator, and
Information). Support of UI frames is optional.

3.1.4 Information Field
The information field is the payload of the frame and carries the user data and any
convergence layer information. The field is octet structured .The information field is
present in UIH frames. The P/F bit should be set to 0 when this field is sent.

3.1.5 Length Indicator
This field is present only in basic option. It has the following format.
Table 3-2 First byte of length field
Bit No.

E/A

The L1 to L7 bits indicate the length of the following data field. The default length is
31 bytes.
According to the rule of ISO/IEC 13239, 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. The total length of the length
field is in that case 15 bits, L1 to L15.

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The second octet of the length field (only present when the EA field in the first byte is
set to 0) format is shown in Table 3-3 .
Table 3-3 Second byte of length field
Bit No.

L10

L11

L12

L13

L14

L15

The length field shall always be present, even if the data field is empty.

3.1.6 Frame Check Sequence
The FCS is calculated over the entire frame, but excluding the flags. Only in case of
UIH frame, the FCS will not be calculated over the information field. The FCS is the
ones complement of the sum (modulo 2) of the remainder of x^k (x7 + x6 + x5 + x4 +
x3 + x2 + x1 + 1) divided (modulo 2) by the generator polynomial x8 + x2 + x + 1,
where k is the number of bits in the frame.

3.2 UIH Control Channel Frame Coding
Figure 3-2 Detailed figure of information field

Type Octet:
EA: Extension bit. It is always set to 1.
C/R: Identifies whether it is a command or response.
TYPE: Hereafter are listed the UIH Command TYPES.

3.2.1 Multiplexer Close Down
The Multiplexer Close Down (CLD) command is used to reset the link into normal AT
command mode without multiplexing.
The multiplexer close down message uses the following type field octet.

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Bit No.

Serial Multiplexer Protocol

C/R

The length byte contains the value 0 and there are no value octets.

3.2.2 DLCI Parameter Negotiation
These services are used to negotiate and set parameters for a specific DLCI. This
procedure is optional. If this command is not supported, default values are applied to
each DLCI.
The DLCI parameter negotiation uses the following type field octet.
Bit No.

C/R

3.2.3 Non Supported Command Response (NSC)
This response is sent whenever a command type is not supported by the receiving
entity. The length byte contains the value 1 and there is one value octets.
The type field octet has the following format.
Bit No.

C/R

The value octet contains the command type of the non-supported command.
The value octet has the following format.
Bit No.

C/R

Command type

The C/R bit (in the value octet above) shall be set to the same value as the C/R bit in
the type field octet of the not supported command frame

3.2.4 Modem Status Command (MSC)
This command shall be sent prior to any user data after a creation of a DLCI. This
command is only relevant when the basic option is chosen.
Command

Length

DLCI

V2.4 Signal

Break Signals (optional)

The length byte contains the value 2 or 3 and there are 2 or 3 value octets.

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The command field octet has the following format.
Bit No.

C/R

The DLCI field identifies the specific DLCI to which the command applies. Bit 2 is
always set to 1 and the EA bit is set.
Bit No.

DLCI

The DLCI field is followed by the control signals field which contains a representation
of the state of the signals.
Bit No.

RTC

RTR

Reserved 0

Description of the control signal byte:


Bit 1: The EA bit is set to 1 in the last octet of the sequence; in other octets, EA
is set to 0. If only one octet is transmitted, EA is set to 1.



Bit 2: Flow Control (FC). The bit is set to 1 (one) when the device is unable to
accept frames.



Bit 3: Ready To Communicate (RTC). The bit is set to 1 when the device is
ready to communicate.



Bit 4: Ready To Receive (RTR). The bit is set to 1 when the device is ready to
receive data.



Bit 5: Reserved for future use. Set to zero by the sender, ignored by the receiver.



Bit 6: Reserved for future use. Set to zero by the sender, ignored by the receiver.



Bit 7: Incoming call indicator (IC). The bit is set to 1 to indicate an incoming call.



Bit 8: Data Valid (DV). The bit is set to 1 to indicate that valid data is being sent.

3.2.5 Flow Control On Command (FCon)
The flow control command is used to handle the aggregate flow. When either entity is
able to receive new information, it transmits this command.
The type field octet has the following format.
Bit No.

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C/R

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3.2.6 Flow Control Off Command (FCoff)
The flow control command is used to handle the aggregate flow. When either entity is
not able to receive information, it transmits the FCoff command. The opposite entity
is not allowed to transmit frames except on the control channel (DLCI=0).
The type field octet has the following format.
Bit No.

C/R

3.2.7 Power Saving Command (PSC)
The power saving control messages use the following type field octet.
Bit No.

C/R

If a station wants to enter a low-power state, it transmits a power saving control
command; the other station replies with a power saving control response.

3.2.8 Service Negotiation Command (SNC)
This command is used to query and set a specific service on a specific DLCI. It is for
instance used to set specific digital voice types.
In some situations, it is not very suitable to mix AT commands and raw data on the
same DLCI. For those situations, special DLCIs can be established and converted to
carry a specific data type. Examples of situation where this is especially useful is for
voice transportation, where the AT commands controlling the connection (for instance
for multiparty) are transported on one DLCI and voice data carried by another DLCI.
If this command is not used, the DLCI is by default set to normal AT command mode.
If this command is used, the DLCI indicated in the DLCI octet, is converted to carry
the specific data type.
The service negotiation messages use the following format.
Bit No.

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Type field code

Length

DLCI

Service value octet
(optional)

Voice codec

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Value octet
(optional)

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Serial Multiplexer Protocol

3.3 UIH Data Channel Frame Coding
Refer to Figure 3-2 and the figure below. The information field is payload of the frame
and carries the user data. The information field exists only for UIH frame type. The
P/F bit should be set to value 0 when this field is sent.

As already discussed Length Indicator specifies the length of Information field. The
information field consists of the user data. The number of octets occupied is specified
by the Length indicator.

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CMUX Functional Description

This chapter provides the user with functionality details of CMUX.

The host side consists of Huawei CMUX application (QT GUI) and CMUX library. QT
GUI consists of mainly 2 modules. They are:


COM Control helps to create or delete the virtual COM ports.



DLCI Control helps to keep track which DLCI is mapping to virtual COM port,
and DLCI deletion can be done.

Target side also consists of CMUX library. Here DLCIs 1, 2, 3, 4 are mapped to AT
command handler. PPP (Dial up) can be activated on any DLCI. The host and the
target are connected through the serial cable.


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Once CMUX is enabled, control DLCI (DLC0) can be created; virtual COM ports
are created and are mapped to DLCIs; DLCI creation can be done.

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

CMUX Functional Description

Once DLCI data channel is established, users can transfer the data through
either from transfer window in QT GUI or through other applications such as
hyper terminal.

Figure 4-1 The CMUX functionality

4.1 Establish CMUX Session
Step 1 First of all, the user application (the host) must force the connected module in
multiplexed mode which is done by sending AT+CMUX command and the target
(Huawei board) responds with OK.
Step 2 Secondly SABM frame is sent for DLC0 by the host and the target responds with UA
frame informing the user that the DLCI is established.
Step 3 DLC0 (control channel) is the first channel established at the initiation of the
multiplexer between the TE (the host) and UE (the target) and it has the DLCI value 0.

4.2 Create Virtual COM Port
Virtual COM ports can be created from the Huawei CMUX application and map the
virtual COM port (not in use) to the specific DLCI (not established) for DLCI creation.

4.3 Create DLCI
Establishment of a DLCI will be initiated by the TE (the host). TE (the host) wishing to
establish a DLCI transmits an SABM frame with the P-bit set to 1. The address field
contains the DLCI value associated with the desired connection.


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If UE (the target) is ready to establish the connection, it will reply with a UA
frame with the F-bit set to 1.

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

CMUX Functional Description

If UE (the target) is not ready or unwilling to establish the particular DLCI, it
responds with a DM frame.

4.4 Send Data
Huawei CMUX data channels (DLCIs) shall be used to transmit user data streams
(UIH data) such as AT command data and GPRS data etc., and data channels shall
be established only once after control channel (DLCI 0) is established.

4.5 Disable MUX
The release of DLCI will be initiated from TE (the host) by the transmission of a DISC
frame with P-bit set to 1.Confirmation of the DLCI release is signaled by UE (the
target) sending a UA response frame with F-bit set to 1. Once the DLCI has been
released, UE (the target) enters into disconnected mode for that particular DLCI. If
UE (the target) receives the DISC command and is already in a disconnected mode,
it will send the DM frame to the TE.
Figure 4-2 CMUX Protocol

The table below summarizes the procedure in enabling MUX, creating DLCIs and
sending data.

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CMUX Functional Description

In the following tables, messages in Red are sent from TE (the host) to UE (the
target); and messages in Blue are sent from UE (the target) to TE (the host).
Table 4-1 Procedure and frames during various MUX operations
PROCEDURE

FRAMES

Start or Enable MUX

AT+CMUX 0,0,5,31,10,3,30,10,1
OK
SABM, DLCI 0
UA, DLCI 0

Create virtual COM ports

None

Map COM port to DLCI

DLCI_PN_CMD, DLCI 1
DLCI_PN_RESP, DLCI 1
SABM, DLCI 1
UA, DLCI 1

Send data

UIH_DATA, DLCI 1
UIH_DATA (with response), DLC1
DISC, DLCI 1 (say only DLCI 1 is
established)

Disable MUX

UA, DLCI 1
CLD_CMD , DLCI 0
CLD_RESP, DLCI 0

The frames and the actual frame formats (as hexadecimal) during various CMUX
operations are shown as below:
Flag

Address

Control

Length Indicator

Information

FCS

Flag

SABM, DLCI 0

UA, DLCI 0

DLCI_PN_CMD,
DLCI1

83 11 01 00
F9

01 0A 1F 00

03 02
DLCI_PN_RESP,
DLCI 1

81 11 01 00
F9

01 0A 1F 00
03 02

SABM, DLCI 1

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UA, DLCI 1

CMUX Functional Description

Flag

Address

Control

Length Indicator

Information

FCS

Flag

FCON CMD, DLC0

A3
F9

01
FCON_REP, DLC0

A1
F9

01
05

FCOFF_CMD, DLC0

63 01

FCOFF_RESP, DLC0

C1 01

MSC_CMD, DLCI 1
(XON)

E3 05 07 0D

MSC_RESP, DLC1
(XON)

E1 05 07 0D

MSC_CMD, DLCI 1
(XOFF)

E3 05 07 0F

MSC_RESP, DLC1
(XOFF)

E1 05 07 0F

DISC, DLC1

UA, DLC1

CLD_CMD, DLC0

C3 01

CLD_RESP, DLC0

C1 01

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Installation Procedures and Requirements

5.1 Install HuaweiCMUXInstaller
The following steps describe how to install the Huawei M2M CMUX Application.
Step 1 Double click the HuaweiCMUXInstaller.exe.

Step 2 The setup welcome window will be dispalyed, and click Next.

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Step 3 Give the installed path and click Next.

Step 4 CMUX Componets List window will be displayed, and click Next.

Step 5 Choose I accept the licenses and click Next.

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Step 6 Huawei M2M CMUX App is the default folder name where the shortcut for the
Huawei CMUX Application is created and click Next.

Step 7 Click Install to begin installing the Huawei CMUX application.

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Step 8 After the Huawei M2M CMUX Application is completed, click Finish to exit the
installation wizard.

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5.2 Create Virtual COM Ports
While creating virtual COM ports through the application for the first time, the
following window may appear many times. Select Install this driver software
anyway.

The following steps show how to increase virtual COM ports creation speed through
the application.
Step 1 Select Properties of My Computer.

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Step 2 Select Advanced System Settings, and System Properties window will be
displayed.

Step 3 Select Hardware > Device Installation Settings, and click OK.

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Step 4 Select No, let me choose what to do, Install diver software… and click Save
Changes. Restart your system to apply the settings as shown in figure below to
avoid COM creation delay.



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Sometimes, the following window appears while creating virtual COM ports using
application even if COM port is not there in system. Click Continue to continue
with COM port creation.

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

While closing the application, sometimes the following message box may appear.
Click Continue.



While creating virtual COM ports through the application, restart message as
shown below may come. Select Restart later.

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Guide of Huawei CMUX Application
The CMUX application developed by Huawei is used on PC channels existing at the
same time on one physical line (serial port). These virtual channels can be used by
different PC applications.
After installing Huawei CMUX application on Windows 7 PC, you can click CMUX
application shortcut or select it from menu.

6.1 CMUX Application Main Window
Figure 6-1 is the main window in the application from which all the features can be
accessed like setting the CMUX parameters, enabling MUX and DLCI creation etc.
Figure 6-1 Huawei CMUX App Main Window

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6.1.1 N1, N2 and T2
The maximum frame size (N1) can vary from 31 bytes to 1540 bytes. By default it is
256 bytes. The maximum number of retransmission (N2) can vary from 0 to 10. The
default value is 3. The response timer (T2) can vary from 10 ms to 250 ms. The
default value is 90 ms.

6.1.2 Baud Rates
In the main window, there is a combo box for the baud rates. Baud rates supported
are 3000000 bit/s, 1000000 bit/s, 921600 bit/s, 460800 bit/s, 230400 bit/s, 115200
bit/s, 57600 bit/s, 38400 bit/s, 19200 bit/s and 9600 bit/s (The 921600 bit/s and
460800 bit/s are for MU509-b, MU709s series and ME209u-526 module; the
3000000 bit/s and 1000000 bit/s are only for ME909s series module). The default
value is 115200 bit/s.

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6.1.3 Help Button
After clicking the HELP, the About Huawei CMUX App window will open which
contain the details about the application.

6.1.4 Enable and Disable MUX
CMUX configuration widget has options to enable and disable MUX as well as has
options to send flow control commands. MUX can be enabled on physical port only.
To enable the MUX, the user can select the physical comport from the COM combo
box at a specific baud rate and set the MUX parameters and then click on OPEN, the
MUX will get enabled.



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On clicking the FCON, the data frames can be sent and received between both
TE (the host) and UE (the target).

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

On clicking the FCOFF, the data frames cannot be received between the targets.



On clicking the CLOSE, the MUX will get disabled.

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6.2 DLCI Main Window
DLCI tab has options to create and delete the virtual ports as well can send the
modem status command for the particular DLCIs.



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On clicking the Add Virtual Port, the virtual ports will get added to the window.

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−

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Create is used for creating the DLCIs.

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

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Guide of Huawei CMUX Application

The Add Virtual Port can add only 4 DLCIs at a time. If it is clicked four more
or than four times, it will give an error message as Cannot create more than
4 DLCIs.

On clicking XCON, the data frames can be sent and received by the host and
target for the particular DLCI. In this example, this modem status command
(XCON) will take place for DLC1.

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Delete is used to delete the mapped DLCI.

6.3 Advanced Main Window
Advanced tab is used to send the control frames.

6.3.1 Create DLCI from Advanced Window
Step 1 Select SABM from Frame Type combo box.

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Step 2 Select DLCI number (say 1) from the DLC Identifier combo box and virtual COM port
(say COM15) from COM combo box. STATUS will show whether the DLCI is already
mapped to another COM or vice versa.

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Guide of Huawei CMUX Application

Step 3 Select Send to send the frame.
Now DLCI creation is done. If the DLCI is already created, sending SABM will fail.

6.3.2 Delete DLCI from Advanced Window
Step 1 Select CTRL_DISC from the Frame Type combo box.
Step 2 Select DLCI number (say 1) from the DLC Identifier combo box and corresponding
virtual COM port from COM combo box.
Step 3 Click Send to send the frame.
This will delete the created DLCI. If the DLCI that is to be deleted is not created, then
an error message will come.

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Guide of Huawei CMUX Application

6.3.3 Send Test Commands from Advanced Window
Step 1 Select TEST_CMD from the Frame Type combo box.
Step 2 Enter the message to be send.
Step 3 Click Send to send the frame.
If data length is less than 127, then data length must be less than frame length (N1) –2 and if
the data length is greater than 127, then data length must be less than frame length (N1) –3.

This will send the message. If the user tries to send empty message or the message
size greater than the maximum frame size (N1), then an error message will come.

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CMUX Application Guide

Guide of Huawei CMUX Application

6.3.4 Close down the CMUX from Advanced Window
Step 1 Select CLD_CMD from the Frame Type combo box .
Step 2 Click Send to send the frame.
This will disable the CMUX.

6.4 AT/Raw Main Window
AT/Raw tab is used to send the AT commands in ASCII and Hex format for a
particular DLCI.
Step 1 Select the created DLCI on which you want to send the AT commands.
Step 2 Select the AT commands from the AT combo box.
New AT commands can be added in the AT combo box through the line edit by
clicking Insert.
Step 3 Click Send to send the AT command.
We can also send the AT commands in Ascii and HEX form by selecting the Radio
box and then click Send to send the command.
The Insert is used to insert the new AT commands in the AT combo box.
The Delete is used to delete the existing AT commands present in the AT combo box.

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Guide of Huawei CMUX Application

6.5 Statistics Application Main Window
Statistics tab is used to show the created DLCI with the time duration when it is
created.

6.6 Log Window
Log window shows frames sent by the host (TE) and the target (UE) in Both Hex and
ASCII format with the time duration. There are checkboxes for DLCIs, if the user
wants to see only the frames sent on DLCI 0 then by checking DLCI 0, the user can
see the frames sent on DLCI 0 only. It is the same with DLC1, DLC2, DLC3, and

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Guide of Huawei CMUX Application

DLC4. If the user wants to see all the frames sent then by checking the ALL
checkbox, the user can see all the frames. The log window can also be saved and
cleared by clicking the SAVE and CLEAR respectively.

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HUAWEI Module
CMUX Application Guide

How to Use Windows Dialer

The following steps describe how to create dialer in windows (to use the virtual port
as the modem port) for M2M project.

7.1 Create the Virtual Ports
Step 1 Create the virtual ports using Com0com software.
Step 2 In Start menu dialog box, input phone and modem.

Step 3 Click Modems tag and then click Add.

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HUAWEI Module
CMUX Application Guide

How to Use Windows Dialer

Step 4 Select the mark option and then click Next.

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CMUX Application Guide

How to Use Windows Dialer

Step 5 Wait till it retrieves all the available configurations, and then select the type of the
modem and click Next.

Step 6 Select the modem port on which the modem has to be configured. And click Next.

Step 7 Final page of configuration, click Finish to create new modem.

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CMUX Application Guide

How to Use Windows Dialer

Step 8 Change the Properties of the modem.

Step 9 Configure the speed of the modem to 115200. And click OK.

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CMUX Application Guide

How to Use Windows Dialer

Step 10 Click Advanced tag and choose Flow control in Data Connection Preferences as
None. And click OK.

Step 11 Click OK on the all windows opened.

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CMUX Application Guide

How to Use Windows Dialer

Step 12 Setup a dialer from Control Panel > Network and Internet > Network Sharing
Center.

Step 13 Click on Set up a new connection or network.

Step 14 Click Set up a dial-up connection and click Next.

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HUAWEI Module
CMUX Application Guide

How to Use Windows Dialer

Step 15 Then select the created modem from the list.

Step 16 Give the Dial-up number as *99# and the dialer name of user choice, and click
Connect.

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CMUX Application Guide

How to Use Windows Dialer

Step 17 Now start MUX on the target. Then create the DLCI on the port where the dial has to
be done.
Open the hyper terminal on that port and initialize the APN. For example, if dialing
has to be done on COM2, create DLCI on the COM2, and then open COM2 in hyper
terminal and initialize the APN. If Airtel SIM is in use, then give the initialize the APN
for Airtel.
AT+CGDCONT=1,"IP","www.airtelgprs.com"

7.2 Disconnect the Hyper Terminal
Then disconnect the hyper terminal. Now follow the steps below.
Step 1 Select the dialer cmux_dialer from the toolbar. Click Connect.

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CMUX Application Guide

How to Use Windows Dialer

Step 2 Select Properties of the dialer.

Step 3 Select the modem from the list (if more than one modems are configured). Click
Configure.

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CMUX Application Guide

How to Use Windows Dialer

Step 4 Select the speed as 115200 and select the Enable hardware flow and click OK.

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CMUX Application Guide

How to Use Windows Dialer

Step 5 Click OK on the remaining windows opened.
Step 6 Click Dial.

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HUAWEI Module
CMUX Application Guide

Summary and Recommendations

The user protocol application shall remember:


Huawei module supports the CMUX basic option and UIH frames. The serial port
must be configured as: 8 data bits, no parity, 1 stop bit and no flow control.
The 909s series module enables CMUX mode only when the hardware flow control is enabled.
The hardware flow control is enabled with the CMUX APP.

While creating DLCIs, make sure only virtual COM ports created through the
application are used. It will be useful if you make a list of virtual ports created by
other applications other than the ones created by the Huawei CMUX app.


Speeds supported are: 3000000 bit/s, 1000000 bit/s, 921600 bit/s, 460800 bit/s,
230400 bit/s, 115200 bit/s, 57600 bit/s, 38400 bit/s, 19200 bit/s and 9600 bit/s
(The 921600 bit/s and 460800 bit/s are for MU509-b, MU709s series and
ME209u-526 module; the 3000000 bit/s and 1000000 bit/s are only for
ME909s series module).



When an asynchronous AT command, such as AT+COPS=?, is executed in a
DLC channel, AT commands executed in other DLC channels are cached.
Responses to those cached commands are returned only after the response to
the asynchronous AT command is returned. Each DLC channel can have only
one cached AT command. (Applies to MU709 series module and ME909s
series)
Speeds are supported through "IPR" setting.

Limitations:


The UIH data cannot be shown in log window because during PPP or bulk
download, it affects the CMUX performance and makes slow down.



We cannot release the ports when It is selected to send the message since all
the tabs are in the same window and we have provided option to select the VSP
in 2 places in AT/RAW window. Hence until the App is closed the VSP will not get
released. Only possible thing is directly send the AT command from other Tools
or only send the AT commands from AT/RAW window



The virtual ports opened in the SSCOM will always write at the speed on which
the MUX is enabled.



Suppose if the MUX is enabled with the baud rate 9600 and the virtual ports are
opened at the speed of 115200, it will write at the speed of 9600 only.

Issue 04 (2015-08-14)

HUAWEI Module
CMUX Application Guide

Summary and Recommendations



If the data length and the data length size in the CMUX frame are in mismatch,
then some of the upcoming frames might get affected (the number of frames
affected depends on the frame size of the MUX session)



CSD feature is not supported over CMUX.



The local upgrade is not supported in the CMUX mode.(Applies to MU709
series module and ME909s series)



The AT commands, such as: AT+IPR, AT&C, AT&D, AT&S, AT+IFC, AT+ICF, ATZ
and AT&F are not effective, and they only return OK in the CMUX mode.
(Applies to MU709 series module and ME909s series)

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HUAWEI Module
CMUX Application Guide

FAQ



FAQ 1: If you try to perform any operation from Advanced window when the
MUX is not enabled, the following error message will be shown.



FAQ 2: If MUX enabling is tried on virtual port, the following error message will
be shown.



FAQ 3: If SABM frame is tried to send again on an already created DLCI, the
following error message will be shown.

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HUAWEI Module
CMUX Application Guide

FAQ



FAQ 4: If already created DLCI is tried to be mapped to another COM, the
following error message will be shown.



FAQ 5: If already mapped COM port is tried to be mapped to another DLCI, the
following error message will be shown.



FAQ 6: If DLCI is tried to be created on a physical port, the following error
message will be shown.



FAQ 7: When you want to send data in Hex format, make sure you enter data in
the following format as shown in this eg: A4 B3… 07 DE. Otherwise the following
error message will be shown.

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HUAWEI Module
CMUX Application Guide

FAQ



FAQ 8: When you try to send large data through Huawei CMUX Application, the
following error will be shown. In such situations, use application like
hyperterminal to send large data.



FAQ 9: When you try to perform TEST_CMD with no data, the following error will
be shown.



FAQ 10: When you try to close the application and the MUX is not disabled, the
following error will be shown.



FAQ 11: When you try to delete virtual COM port which is in use, restart option
may come. Make sure that applications using that COM is closed before trying to
delete it from Huawei CMUX Application.

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HUAWEI Module
CMUX Application Guide

Abbreviations

Full spelling

3GPP

3rd Generation Partnership Project

CLD_CMD

Close Down Command

CLD_RESP

Close Down Response

DISC

Disconnect Command

DLCI

Data Link Connection Identifier

DLCI_PN_CMD

DLCI Parameter Negotiation Command

DLCI_PN_RESP

DLCI Parameter Negotiation Response

Disconnected Mode

ERM

Error-Recovery Mode

FCS

Frame Check Sequence

MSC

Modem Status Command

NSC

Non Supported Command

PSC

Power Saving Control

SABM

Set Asynchronous Balanced Mode

Terminal Equipment

Technical Specification

Unnumbered Acknowledgement

User Equipment

Unnumbered Information

UIH

Unnumbered Information with Header check

Issue 04 (2015-08-14)

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