Aria-130 Digital Key Telephone System
Issue: 1.2
Installation Manual
71
3.4.4.6 DTRU/DTRU II/DTRU 4 Installation
A DTRU contains 2 DTMF receiver circuits and a DTRU II/DTRU 4 has 4 DTMF receiver circuits. Each
receiver of DTRU/DTRU II/DTRU 4 is time-shared under the control of the system software, as a system
resource regardless its position.
BOARD
The position of Installation
The quantity of receivers
Marking on PCB
DTRU
SLIB24, SLIB48, DSIB, LCOB
2 DTMF receivers
DTRU of GDK-34
DTRU II
SLIB II
4 DTMF receivers
GDK-100 DTRU II
DTRU 4
SLIB II, SLIB2E
4 DTMF receivers
ARIA-130 DTRU 4
Table 3.4.16 DTRU
The System is capable of supporting DTMF receivers up to 46.
At least a DTRU or DTRU II should be installed to receive DTMF signals.
Take a cautious attitude in installing DTRU on the boards because DTRU contains the connectors
without the connection guide, otherwise DTRU may be damaged by wrong connection.
3.4.4.7 MSGU/MSGU48/MSGUII Installation
A message waiting unit can be optionally installed on a SLT interface board to light a message waiting
lamp in the SLT connected. There are 3 kinds of message waiting units as followings according to the line
voltage.
BOARD
The position of Installation
The quantity of circuits
The line voltage
MSGU
SLIB24, DSIB
6 circuits
+24V DC
MSGU48
SLIB48, SLIB2E
6 circuits
-48V DC, -28V DC(SLIB2E)
MSGU II
SLIB II
12 circuits
-28V DC
Table 3.4.17 MSGU
•
Signal voltage: 90~100V DC
3.4.5 Analog CO Line Board Installation
There are several types of analog CO line boards available.
Every CO line board contains several types of connectors for the line connection on the front edge of the
boards themselves.
Maximum 40 CO lines can be installed in ARIA-130 system.
3.4.5.1 LCOB Installation
LCOB provides 4 Loop Start CO line interfaces. The board can be optionally equipped with Call Metering
Unit (CMU) boards to monitor call duration and a Call Progress Tone Unit (CPTU) daughter board to
detect call progress signals. A CMU must be provided for each Loop Start CO Line which requires call
metering. In addition, the appropriate type of CMU must be employed.
If required, install the CMUs and CPTU on the CO interface board as shown in Fig 3.4.10 and insert the
boards in the selected card slot.
