Chapter 1 Overview
Accessories and options
30 WCDMA Options Version 6.20
Enhanced Full Rate is a newer codec algorithm that provides better speech
quality than Full Rate. To convert Half Rate or Enhanced Full Rate into audible
sound, you will need the Codec Extension Option in addition to the Basic Codec
Option.
Audio measurements on the 4400
High-precision time base
In its basic configuration, the 4400 is equipped with a TCXO 10 MHz time base.
The specified accuracy is approx. 1E-6 or 1 ppm (10 Hz). The OCXO option
provides an increased accuracy of approx. 5E-8 or 0.05 ppm (0.5 Hz).
Multislot measurement capabilities (HSCSD) (for GSM, GSM/GPRS and EDGE
only)
HSCSD (= High Speed Circuit Switched Data) enhances standard GSM with the
bundled use of several time slots within a GSM frame for data transmission.
Theoretically, the maximum data transmission rate in HSCSD is n * 14.400 bps,
where n is the number of the bundled time slots.
In case of the 4400, the maximum for n equals 4; this means that the 4400 can
transmit and/or receive on four time slots per frame.
The tool to perform tests on HSCSD mobiles is called Multislot/HSCSD Option.
Option Willtek order number
4470 Audio Option M 248 360
4470 Audio Option for 4400 with
CDMA2000 only
M 248 653
4471 Basic Codec Option M 248 364
4472 Codec Extension Option M 897 156
Option Willtek order number
4471 OCXO option M 214 028
Option Willtek order number
4461 Multislot/HSCSD Option M 897 158
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