Installation manual

IP DECT Installation Page 17
15-601085 Issue 04f (11 June 2009)IP Office
IP DECT: System Capacities
1.6 Technical Specification
Digital Enhanced Cordless Telecommunication (DECT)
The standard (ETS 300 175) essentially specifies the air interface, known as the radio interface. Voice and data can both
be transmitted via this interface.
DECT technical characteristics are:
· United States:
· Frequency Range: 1.920 to 1.930 GHz (10MHz bandwidth).
· Carrier Frequencies: 5 (1.728 MHz spacing) with 12 time slots each.
· Transmit Power: 20dBm.
· Maximum transmission power of 4 mW (100 mW peak).
· Europe, Middle East and Asia:
· Frequency Range: 1.880 to 1.900GHz (20MHz bandwidth).
· Carrier Frequencies: 10 (1.728 MHz spacing) with 12 time slots each.
· Transmit Power: 24dBm.
· Maximum transmission power of 10 mW (250 mW peak).
· Doubling the number of time slots using the TDMA process
· Net data rate per channel of 32 kbps for voice transmission using ADPCM.
· Voice coding using the ADPCM method.
Generic Access Profile (GAP)
· The GAP standard (ETS 300 444) is based on the same technology as DECT, but is limited to the most important
basic features. This standard was created in order to allow phones of different vendors to be used on any type of
DECT system. It thus represents the smallest common denominator of all manufacturer-specific variants of the
DECT standard.
· An important limitation in the GAP standard is that external handover is not possible. For this reason connection
handover is used, which is supported by GAP terminals.
· The operation of GAP-capable phones is comparable to that of analogue terminals. For example, features can be
called up via * and # procedures.