Telecommunications Technical Terms Index

Caller I.D. = Caller identification. Incoming caller's phone number is displayed

C.L.I. = Calling Line Identity. Telephone number is displayed on outgoing calls

CCU = Central Control Unit

Dialing (Pulse) = Dialing mode used on older exchanges and telephone systems

Dialing (Tone) = Dialing mode used on modern exchanges and telephone systems

Earth Recall = Older method of transfering calls using recall button

ELR = Earth Recall = Older method of transfering calls using recall button

Handsfree = Telephone with built in microphone and speaker

H/F = Handsfree. Telephone with built in microphone and speaker

Key Terminal = Designated telephone to be used on a particular telephone system

Keyphone = Designated telephone to be used on a particular telephone system

LD Dialing = Pulse dialing used on older exchanges and telephone systems

L.C.D. = Liquid Crystal Display. Screen on a telephone.

L.J.U. = Line Jack Unit. Telephone socket.

Liquid Crystal Display = Screen on a telephone.

Loop Disconnect = Pulse dialing used on older exchanges and telephone systems

MF Dialing = Tone dialing used on modern exchanges and telephone systems

Multi Frequency Dialing = Tone dialing used on modern exchanges and telephone systems

M.O.H = Music On Hold

O.H.D = On Hook Dailing enables telephone to dial number without lifting handset.

On Hook Dailing = Enables telephone to dial a number without lifting handset.

Plan Set (BT Systems) = Designated telephone to be used on a particular telephone system

POT (Plain Ordinary Telephone) = Ordinary telephone

Proprietary Telephone = Designated telephone to be used on a particular telephone system

Pulse Dialing = Dialing mode used on older exchanges and telephone systems

Single Line Telephone (SLT) = Ordinary telephone

T.B.R. = Time Break Recall. Method of transfering calls used on more modern systems

Test Jack Frame = Connection box or frame used for telephone system's cabling

Time Break Recall = Method of transfering calls used on more modern systems

T.J.F. = Test Jack Frame. Connection box or frame used for telephone system's cabling

Tone Dialing = Dialing mode used on modern exchanges and telephone systems

Index of telephone systems by name and manufacturer