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Encoding
The data of your fax transmission are encoded and
compressed for the transmission. The minimum stand-
ard is MH (Modified Huffmann). Better encoding meth-
ods are MR (Modified Read) or MMR (Modified Modi-
EN
fied Read).
Error Correction Mode (ECM)
The ECM method reduces transmission errors that
result, for example, from bad telephone lines, thereby
reducing the duration of transmissions. Both of the con-
nected fax machines must support ECM.
Fax Groups
Fax machines are classified in terms of internationally
standardised fax groups based on their transfer type and
speed. Connections between two devices of different
groups is possible; the lowest common transfer rate is
selected. The determination of the speed takes place
during the handshake (see Handshake). Fax groups 1 to
3 are analogue fax machines. Nowadays, groups 1 and 2
are hardly to be found any longer; fax machines of group
3—which have a transfer speed that ranges from 9,600
to 33,600¦bps—are currently most standard. Group 4
fax machines are digital devices that function exclusively
on ISDN systems. They have a maximum transfer speed
of 64,000¦bps.
Fax Polling
With active fax polling, one can retrieve a document
from another fax machine. For fax polling from a larger
company offering several polling services, you can also
enter sub-addresses / direct-dial numbers. In order to
do this, you must insert a dialling pause between the fax
number and the sub-address (see Dialling Pause).
Fax Signal, CNG Tone (= Calling Signal)
The tone that a fax machine sends out to announce a fax
transmission. When the CNG tone occurs, the fax
switch of the device recognises an incoming fax call and
starts the fax reception.
Fax Switch
The fax switch checks incoming telephone calls and con-
trols the ringing behaviour of the fax machine. Accord-
ing to the selected mode, fax transmissions will be
received either automatically or manually.
Flash Key (R-key)
With the flash key, you can make use of additional tele-
phone services if these special functions are enabled for
your telephone line. The R key has replaced the hook-
flash function. (see Call Waiting, Call-toggling).
Handshake
The handshake is the initial and final phase of a fax trans-
mission. After establishing of the connection, fax
machines check the group affiliation and features such as
size compression or grey tones. After the fax transmis-
sion has been completed and before the connection is
terminated, the receiving device confirms receipt of the
transmission (see Fax Groups).
Hook-Flash Function
See Flash Key
84
ISDN
Integrated Services Digital Network
ITU
International Telecommunications Union (UN organisa-
tion)
LCD
Liquid Crystal Display
Memory
If there is no paper or toner in your device, the device
will store incoming fax transmissions in its memory.
MH
Modified Huffmann (encoding process for faxes, see
Encoding)
MMR
Modified Modified Read (encoding process for faxes,
see Encoding)
MR
Modified Read (encoding process for faxes, see Encod-
ing)
Outside Line Access Code
The outside line access code is the number or letter
that must be dialled before the actual telephone number
on a telephone of a private branch exchange in order to
establish a connection to the public telephone network
(see Private Branch Exchange).
PABX/PBX
Private Automatic Branch Exchange
Polling
see Fax Polling
POTS
Plain Old Telephone Service
Private Branch Exchange
Private branch exchanges are common in larger compa-
nies. Even private ISDN systems can be branch
exchanges. To establish a connection to the public tele-
phone network from a private branch exchange, one
must dial a number or press a key before the actual tel-
ephone number; in most cases this is zero (see Outside
Line Access Code).
PSTN
Public Switched Telephone Network
Pulse Dialling
A dialling process that is used in older telephone net-
works. You hear a clicking for each number dialled (see
Tone Dialling).
RJ-11
Registered Jack 11 (also called Western plug, standard-
ised telephone plug)
Scanning
The reading of a document into the fax memory or into
the computer in order to send it, copy it or edit it.
Philips · LaserMFD 6170dw
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