|
D
|
| DASS / DASS II |
Digital Access Signalling System protocols
used on UK ISDN |
| DCE |
Data Communication Equipment |
| DDI |
Direct Dialling Inwards, a part of the dialled
number is passed to the destination equipment and used
to route the call to the required telephone |
| DECT |
Digital European Cordless Telephone specification |
| DID |
Direct Inward Dialling, a specific line
is set to ring a specific extension |
| DISA |
Direct Inward System Access, the system
answers the incoming call and accepts DTMF dialling from
the caller to determine the required destination extension |
| DND |
Do Not Disturb, prevents incoming calls
ringing |
| DPNSS |
Digital Private Network Signalling System |
| DTE |
Data Terminal Equipment |
| DTMF |
Dialling, the sending of tone combinations
to represent the numbers required
Dual Tone Multi Frequency |
| Dual Tone Multi-frequency |
See DTMF |
|
E
|
| Earth Recall |
A signal from telephone to the exchange/PBX
to hold a call or access a feature |
|
F
|
| FAX |
Facsimile machine or facsimile transmitted
document |
| FAXTAM |
Facsimile with built in telephone answering
machine |
| Flash |
A signal to clear the current call and retain
the line for a follow on call |
|
H
|
| Headset |
Similar to Hi-Fi headphones with a microphone
and boom. Replaces the handset |
| Hold |
The speech too and from the caller is muted
and in some cases they are played music, whilst on hold. |
| Hook Switch |
The switch which loops (busy)
and un-loops (idle) the telephone from the line |
|
I
|
| ICM |
Incoming Message, recorded by
a telephone answering machine |
| IDD |
International Direct Dialling |
| Inductive Coupler |
A device fitted to handsets
to allow a telephone to transmit speech to hearing aids
for users with hearing impediments |
| ISDN |
Integrated Services Digital
Network |
| ISDN 2 |
BT basic rate interface for
ISDN |
| ISDN 30 |
BT primary rate interface for
ISDN |
| ITU |
International Telecommunications
Union, formerly the CCITT |
|
K
|
| Key System |
A system offering a key and
lamp representation of lines and or extensions, usually
requiring proprietary telephones |
| Kilostream |
64 Kbps digital leased line |
| KTS |
Key Telephone Set or Key Telephone
System |
|
L
|
| Last Number Redial |
The last number dialled is stored
and can be dialled by a single button or short code at
a later time |
| LCD |
Liquid Crystal Display |
| Loop Disconnect |
See Pulse Dialling |
|
M
|
| MCL |
Abbreviation for Mercury Communications
Ltd |
| Megastream |
2 Mbps digital leased line |
| Memory |
Storage for a telephone number
allowing the number to be dialled using a single button
or short code |
| Mercury Button |
A special memory location allowing
the users Mercury PIN and access code to be sent with
a single button press |
| Meter Pulses |
Signals from the exchange signalling
the increment of charge units for a call |
| Modem |
MODulator/DEModulator |
| Multiplexer |
A device to combine calls onto
a single transmission medium |
| Music On Hold |
Music played through a system
to callers placed on hold |
|
O
|
| OGM |
Outgoing Message, played by
the answering machine to callers |
| On Hook Dialling |
The ability to dial a number
without needing to lift the handset |
