CTP Systems CTPhone 1900, Applications Manual

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CTPhone 1900 System Overview
CTPhone Handset
The CTPhone handset is easy to use. A Liquid Crystal Display (LCD)
shows dialed numbers, icons that report the handset status, and prompts
that assist callers to make calls and execute telephone features. The
handset has a 12-button keypad and additional keys that facilitate handset
use.
The handset’s small size and light weight make it convenient for carrying
in pockets or attaching to belts. It also features an internal antenna which
adds to ease-of-use while protecting the antenna from physical damage.
How CTPhone Calls Take Place
Call Initiation
CTPhone calls are similar to other calls that take place in a telephone sys-
tem, except that every call to or from a CTPhone handset involves estab-
lishing an RF (radio frequency) link between the handset and a base
station. In idle state, a handset scans system base stations and locks onto
the base station with the best signal.
System and handset IDs assigned in the system also affect CTPhone
calls. The CTPhone Controller is assigned a unique system ID, and a
CTPhone handset must be programmed with that system ID and a unique
handset ID before it can communicate with a base station connected to
that CTPhone Controller. Up to eight system IDs with associated handset
IDs may be programmed into a CTPhone handset, allowing it to operate in
multiple CTPhone 1900 systems. For more information on system and
handset IDs, see Table 4-D on page 4-10.
Calls to a CTPhone Handset
1 The CTPhone Controller receives a call to a CTPhone extension.
2 To locate the called party, the CTPhone Controller sends a request
containing the ID of the called CTPhone handset to all system base
stations.
3 The system base stations signal the handset and the handset
responds to the base station onto which it is locked.
4 The base station responds to the CTPhone Controller and the RF link
is established. The call then proceeds like any other call in the office
telephone system.