GDK-100
DIGITAL KEY TELEPHONE SYSTEM
32
2.4.12.7 MSGU/MSGU48/MSGU II (Message Wait Unit)
The Message Wait Unit sends 90VDC signal to the SLT illuminating the Message Wait lamp. The MSGU
and MSGU48 contain 6 Circuits to support 6 SLTs. The MSGUII contains 12 circuits to support 12 SLTs.
MSGU can be optionally installed on SLIB24 and DSIB.
MSGU48 can be optionally installed on SLIB48.
MSGU II can be optionally installed on SLIB II.
2.4.12.8 CPTU (Call Progress Tone Detection Unit; CPTU/A, CPTU/B)
The Call Progress Tone Detection Unit is used to detect specific call progress tones which are supplied
from the CO or PABX. Tone detection is employed to support features such as ACNR(Automatic Called
Number Redial).
CPTU provides 2 tone detection circuits that are time-shared under the control of the system software,
as a system resource regardless its position.
CPTU have two versions; CPTU/A and CPTU/B. CPTU/A has wide tone detection range (305Hz -
640Hz), and CPTU/B has narrow tone detection range (350Hz, 620Hz, 440Hz, 480Hz
±
1% ).
Any Kind of CPTU can be optionally installed on the LCOB, BWDIDB and E1IB.
It is important to check the local specification regarding call progress tone to use CPTU/B.
2.4.12.9 CMU (Call Metering Unit)
The Call Metering Unit detects call metering signals from the CO or PABX to monitor call
duration/charges. There are six kinds of CMUs as followings,
- 12KHz
- 12KHz and Polarity Reversal
- 16KHz
- 50Hz Longitudinal
- 50Hz Longitudinal and Polarity Reversal
- Polarity Reversal
CMU can be optionally installed on the LCOB and each CMU supports one CO Line.
Each type of CMU can be installed on the LCOB according to the local market condition and
national regulatory requirements.
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