Specifications

Interface Protocols
Operating Characteristics
3-8 68P81095E55-E August 08, 2000
Figure 3-5 TDMA Radio Link timeslots.
The iDEN TDMA system divides the RF carrier into 6 discrete timeslots of 15 ms in
duration. Each of these timeslots is a separate unit that contains; overhead for
transmitter turn-on, training & synchronization, propagation delay, or conversation.
Auxiliary data imbedded within each slot provides associated signaling. The sharing
of the timeslots (interleaving) increases the carriers capacity.
Timeslot 1 on a BR of each sector or cell is designated as a Primary Control Channel.
These channels are used for call setup, MS contact and MS location. Secondary
Control Channels may be assigned if traffic volume is high enough to saturate the
Primary Control Channels.
(4x4.5Mhz) + 0.6 ramp (actual carrier)
4.5KHz 4.5KHz4.5KHz
Analog = 1 conversation per radio
64 kilo-bit-per-second
1
2
3
4
5
6
time
Signaling or conversation 1
Signaling or conversation 2
Signaling or conversation 3
Signaling or conversation 4
Signaling or conversation 5
Signaling or conversation 6
time
Digital = 3 to 6 conversations per radio