G3-2 Switch 00 (SP No. 1-106-001)

No

Function

Comments

0

1

Monitor speaker during communication (TX and RX)

(0, 0): The monitor speaker is disabled all through the communication.

(0, 1): The monitor speaker is on up to phase B in the T.30 protocol.

(1, 0): Used for testing. The monitor speaker is on all through the communication. Make sure that you reset these bits after testing.

Bit 1

Bit 0

Setting

0

0

Disable

0

1

Up to Phase B

1

0

All the time

1

1

Not used

2

Monitor speaker during memory transmission

0: Disabled 1: Enabled

1: The monitor speaker is enabled during memory transmission.

3-7

Not used

Do not change the settings.

G3-2 Switch 01 (SP No. 1-106-002)

No

Function

Comments

0-3

Not used

Do not change the settings.

4

DIS frame length

0: 10 bytes 1: 4 bytes

1: The bytes in the DIS frame after the 4th byte will not be transmitted (set to 1 if there are communication problems with PC-based faxes which cannot receive the extended DIS frames).

5

Not used

Do not change the setting.

6

Forbid CED/ANSam output 0: Off

1: On (Forbid output)

Do not change this setting (Default: 0: Off), unless communication problem is caused by a CED or ANSam transmission.

7

Not used

Do not change the setting.

G3-2 Switch 02 (SP No. 1-106-003)

No

Function

Comments

0

G3 protocol mode used

0: Standard and non-standard 1: Standard only

Change this bit to 1 only when the other end can only communicate with machines that send

T.30-standard frames only.

1: Disables NSF/NSS signals (these are used in non-standard mode communication)

1-4

Not used

Do not change the settings.

5

AI modem rate selection 0: OFF, 1: ON

Selects if the AI modem rate is ON or OFF.

6

Not used

Do not change the settings.

7

Short preamble

0: Disabled 1: Enabled

Refer to Appendix B in the Group 3 Facsimile Manual for details about Short Preamble.

G3-2 Switch 03 (SP No. 1-106-004)

No

Function

Comments

0

DIS detection number (Echo countermeasure) 0: 1

1: 2

0: The machine will hang up if it receives the same DIS frame twice.

1: Before sending DCS, the machine will wait for the second DIS which is caused by echo on the line.

1

Not Used

Do not change the settings.

2

Not Used

Do not change the settings.

3

ECM frame size 0: 256 bytes

1: 64 bytes

Keep this bit at "0" in most cases.

4

CTC transmission conditions 0: After one PPR signal received

1: After four PPR signals received (ITU-T standard)

0: When using ECM in non-standard (NSF/NSS) mode, the machine sends a CTC to drop back the modem rate after receiving a PPR, if the following condition is met in communications at 14.4, 12.0, 9.6, and 7.2 kbps.

Ntransmit = Number of transmitted frames Nresend = Number of frames to be retransmitted 1: When using ECM, the machine sends a CTC to drop back the modem rate after receiving four PPRs.

PPR, CTC: These are ECM protocol signals. This bit is not effective in V.34 communications.

5

Modem rate used for the next page after receiving a negative code (RTN or PIN)

0: No change 1: Fallback

1: The machine's TX modem rate will fall back before sending the next page if a negative code is received. This bit is ignored if ECM is being used.

6

Not used

Do not change the settings

7

Select detection of reverse

This switch is used to prevent reverse polarity in

polarity in ringing

ringing on the phone line (applied to PSTN-G3

0: Off

ringing). Do not change this setting

1: On

0: No detection

1: Detection (Japan and Korea only)

G3-2 Switch 04 (SP No. 1-106-005)

No

Function

Comments

0-3

Training error detection threshold

0 - F (Hex); 0 - 15 bits

If the number of error bits in the received TCF is below this threshold, the machine informs the sender that training has succeeded.

4-7

Not used

Do not change the settings.

G3-2 Switch 05 (SP No. 1-106-006)

No

Function

Comments

0-3

Initial TX modem rate (kbps)

These bits set the initial starting modem rate for transmission.

Use the dedicated transmission parameters if you need to change this for specific receivers.

If a modem rate 14.4 kbps or slower is selected, V.8 protocol should be disabled manually.

Cross reference

V.8 protocol on/off - G3 switch 03, bit 2

Bit 3

Bit 2

Bit 1

Bit 0

kbps

0

0

0

1

2.4

0

0

1

0

4.8

0

0

1

1

7.2

0

1

0

0

9.6

0

1

0

1

12.0

0

1

1

0

14.4

0

1

1

1

16.8

1

0

0

0

19.2

1

0

0

1

21.6

1

0

1

0

24.0

1

0

1

1

26.4

1

1

0

0

28.8

1

1

0

1

31.2

Other settings - Not used

4-5

Initial modem type for 9.6 k or 7.2 kbps.

These bits set the initial modem type for

9.6 and 7.2 kbps, if the initial modem rate is set at these speeds.

Bit 5

Bit 4

Setting

0

0

V.29

0

1

V.17

1

0

V.34

1

1

Not used

6-7

Not used

Do not change the settings.

G3-2 Switch 06 (SP No. 1-106-007)

No

Function

Comments

0-3

Initial RX modem rate(kbps)

These bits set the initial starting modem rate for reception.

Use a lower setting if high speeds pose problems during reception.

If a modem rate 14.4 kbps or slower is selected, V.8 protocol should be disabled manually.

Cross reference

V.8 protocol on/off - G3 switch 03, bit2

Bit 3

Bit 2

Bit 1

Bit 0

kbps

0

0

0

1

2.4

0

0

1

0

4.8

0

0

1

1

7.2

0

1

0

0

9.6

0

1

0

1

12.0

0

1

1

0

14.4

0

1

1

1

16.8

1

0

0

0

19.2

1

0

0

1

21.6

1

0

1

0

24.0

1

0

1

1

26.4

1

1

0

0

28.8

1

1

0

1

31.2

Other settings - Not used

4-7

Modem types available for reception

The setting of these bits is used to inform the transmitting terminal of the available modem type for the machine in receive mode.

If V.34 is not selected, V.8 protocol must be disabled manually. Cross reference

V.8 protocol on/off - G3 switch 03, bit 2

Bit 7

Bit 6

Bit 5

Bit 4

Types

0

0

0

1

V.27ter

0

0

1

0

V.27ter

0

0

1

1

V.27ter

0

1

0

0

V.27ter

0

1

0

1

V.27ter

Other settings - Not used

G3-2 Switch 07 (SP No. 1-106-008)

No

Function

Comments

0-1

PSTN cable equalizer (TX mode: Internal)

Use a higher setting if there is signal loss at higher frequencies because of the length of wire between the modem and the telephone exchange.

Use the dedicated transmission parameters for specific receivers.

Also, try using the cable equalizer if one or more of the following symptoms

Bit 1

Bit 0

Setting

0

0

None

0

1

Low

1

0

Medium

1

1

High

occurs. Communication error

Modem rate fallback occurs frequently.

 This setting is not effective in

V.34 communications.

2-3

PSTN cable equalizer (RX mode: Internal)

Use a higher setting if there is signal loss at higher frequencies because of the length of wire between the modem and the telephone exchange.

Also, try using the cable equalizer if one or more of the following symptoms occurs.

Communication error with error codes such as 0-20, 0-23, etc.

Modem rate fallback occurs frequently.

 This setting is not effective in

V.34 communications.

Bit 3

Bit 2

Setting

0

0

None

0

1

Low

1

0

Medium

1

1

High

4

PSTN cable equalizer (V.8/V.17 RX mode: External) 0: Disabled

1: Enabled

Keep this bit at "1".

5-7

Not used

Do not change the settings.

G3-2 Switch 08 - Not used (do not change the settings)

G3-2 Switch 09 - Not used (do not change the settings)

G3-2 Switch 0A (SP No. 1-106-011)

No

Function

Comments

0-1

Maximum allowable carrier drop during image data reception

These bits set the acceptable modem carrier drop time.

Try a longer setting if error code 0-22 is

Bit 1

Bit 0

Value (ms)

0

0

200

frequent.

0

1

400

1

0

800

1

1

Not used

2-3

Not used

Do not change the settings

4

Maximum allowable frame interval during image data reception.

0: 5 s 1: 13 s

This bit set the maximum interval between EOL (end-of-line) signals and the maximum interval between ECM frames from the other end.

Try using a longer setting if error code 0-21 is frequent.

5

Not used

Do not change the settings.

6

Reconstruction time for the first line in receive mode

0: 6 s 1: 12 s

When the sending terminal is controlled by a computer, there may be a delay in receiving page data after the local machine accepts set-up data and sends CFR. This is outside the T.30 recommendation. But, if this delay occurs, set this bit to 1 to give the sending machine more time to send data. Refer to error code 0-20.

ITU-T T.30 recommendation: The first line should come within 5 s of CFR.

7

Not used

Do not change the settings.

G3-2 Switch 0B- Not used (do not change the settings)

G3-2 Switch 0C- Not used (do not change the settings)

G3-2 Switch 0E- Not used (do not change the settings)

G3-2 Switch 0F- Not used (do not change the settings)