LANs Local Area Networks (LANs) link computers together so they can share files, software, hard disks and peripherals such as printers. A LAN provides facilities for user communications within a defined building or plant and which does not necessarily use public service facilities or standards.
LAST NUMBER REDIAL This allows you to very quickly redial the last number called by pressing a single key.
LEASED LINE A dedicated circuit, supplied by the PTT or other licensed operator, which permanently connects two or more user locations and is for the sole use of the subscriber.
LEAST COST ROUTING This is where one or more alternative carriers are used and the telephone system is programmed to select more than one different carriers for your calls. You program the system with which type of call is to be carried over which network and at which time of day. This enables you to always get the lowest available call charges.
LED/LCD DISPLAYS Liquid crystal displays found on sophisticated key stations and feature phones which can display such things as the number you have dialled, the number of an internal calling party and depending on the level of sophistication they may also display text messages. Some systems are context so they tell you what features are available at any time when using the phone.
LINE STATUS INDICATORS Line status indicators are lights found on key systems which indicate whether an exchange line or extension is in use. A DSS console can be added to some handsets of larger systems to make this more convenient. On very large systems, only some of the lines can be represented.
LOCAL LOOP The local loop is the part of the telephone network that links your system to BT’s local exchange. Although still analogue this can be digitised if you are using ISDN.
LOCK CODES This feature prevents unauthorised outside calls being made by using a PIN number to lock an extension. This does not restrict incoming calls which are received as normal.
