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KX-MB2051RUB / KX-MB2061RUB

This section is the explanation about analog signal route of voice, beep, fax signal, DTMF signal and so on.
Refer to Check Sheet for Signal Route (P.197).

1. Function

This is the function when you are not holding the handset and can hear the caller’s voice from the line.

2. Signal Path

Refer to Check Sheet for Signal Route(P.197).

1. Function

This circuit controls the conversation over the handset, i.e. the transmitted and received voices to and from the handset.

2. Signal Path (Transmission signal)

Refer to Check Sheet for Signal Route(P.197).

1. Function

This circuit monitors various tones, such as (1) DTMF tone, (2) Alarm/Beep/Key tone/Bell.

2. Signal Path

Refer to Check Sheet for Signal Route (P.197).

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KX-MB2051RUB / KX-MB2061RUB

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KX-MB2051RUB / KX-MB2061RUB

The unit uses MODEM (IC300) that serves as an interface between the control section for FAX transmission and reception and
the telephone line. During a transmitting operation, the digital image signals are modulated and sent to the telephone line via
AFE(Analog Front End : IC200).
During a receiving operation, the analog image signals which are received from the telephone line via AFE(IC200) are demodu-
lated and converted into digital image signals. The communication format and procedures for FAX communication are standard-
ized by ITU-T. MODEM has hardware which sends and detects all of the necessary signals for FAX communication. 
It can be controlled by the SOC (inside:IC300).
This MODEM also sends DTMF signals, and detects a caller ID signal, a busy tone and dial tones.

Overview of Facsimile Communication Procedures (ITU-T Recommendation):

1. ON CCITT (International Telegraph and Telephone Consultative Committee) 

The No. XIV Group of ITU-T, one of the four permanent organizations of the International Telecommunications Union (ITU),
investigates and make recommendations on international standards for facsimiles.

2. Definition of Each Group

• Group I (G1) 

Official A-4 size documents without using formats which reduce the band width of a signal are sent over telephone lines.
Determined in 1968. 
Transmission for about 6 minutes at a scanning line density of 3.85 lines/mm.

• Group II (G2) 

Using reduction technology in the modulation/demodulation format, an A-4 size document is sent at an official scanning line
density of 3.85 lines/mm for about 3 minutes. 
Methods to suppress redundancy are not used.
Determined in 1976.

• Group III (G3) 

Method of suppressing redundancy in the image signal prior to modulation is used. An A-4 size document is sent within 
about one minute.
Determined in 1980.

• Group IV (G4) 

Transmission is via the data network. A method is provided for suppressing redundancy in signals prior to transmission, and 
error-free reception of transmission is possible.
The scope of these facsimile applications is not limited simply to transmission of written statements. Through symbiotic link-
ages with other communication methods, it can be expected to expand to include integrated services.

3. Facsimile Call Time Series

As shown in the following diagram, the facsimile call time series is divided into five phases.

Phase A: Call setting 
Call setting can be manual/automatic. 
Phase B: Pre-message procedure 
Phase B is a pre-processing procedure and sequence for confirming the status of the terminal, transmission route, etc., and
for terminal control. It implements terminal preparation status, determines and displays terminal constants, confirms synchro-
nization status, etc. and prepares for transmission of facsimile messages. 
Phase C: Message transmission 
Phase C is the procedure for the transmitting facsimile messages.
Phase D: Post message procedure 
Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B
or phase C is repeated for transmission. 
Phase E: Call retrieval 
Phase E is the procedure for call retrieval, that is for circuit disconnection.

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KX-MB2051RUB / KX-MB2061RUB

4. Concerning Transmission Time

Transmission Time   =    Control Time  +    Image Transmission Time     +    Hold Time

Transmission time consists of the following.
Control time:

This is time at the start of transmission when the functions at the sending and receiving sides are confirmed, the transmis-
sion mode is established, and transmission and reception are synchronized.

This is the time required for the transmission of document contents (image data). In general, this time is recorded  in  the
catalog, etc.

This is the time required after the document contents have been sent to confirm that the document was actually sent, and
to check for telephone reservations and/or the existence of continuous transmission.

5. Facsimile Standards

 

Item

Telephone Network Facsimile

G3 Machine

Connection Control Mode

Telephone Network Signal Mode

Terminal Control Mode

T. 30 Binary

Facsimile Signal Format

Digital

Modulation Mode

PSK (V. 27 ter) or QAM (V. 29) or TCM (V17,V34)

Transmission Speed

300 bps (Control Signal)
33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, 2400 bps (FAX Signal)

Redundancy Compression
 
Process
 
(Coding Mode)

1 dimension: MH Mode
 
2 dimension: MR Mode (K=2.4)
 
3 dimension: MMR Mode

Resolution

Main Scan: 8 pel/mm
 
Sub Scan: 3.85, 7.7l/mm

Line Synchronization Signal

EOL Signal

1 Line Transmission Time
 
[ms/line]

Depends on the degree of data reduction.
 
Minimum Value: 10, 20
 
Can be recognized in 40ms.