Aria-130 Digital Key Telephone System
Issue: 1.2
Installation Manual
31
In case of using two WTIBs, the boards should be installed in the same KSU.
S/W Version of WTIB Board is 1.0H
2.4.9 Analog Trunk Boards
Five kinds of analog trunk boards are available in ARIA-130 system;
Board Name
Interface circuit
Trunk Type
Remark
LCOB
4 ports
Loop Start
LCOB8
8 ports
Loop Start
EMIB
4 ports
E&M
Table 2.4.7 Capacity of SLT boards
2.4.9.1 LCOB (Loop Start Co Line Interface Board)
LCOB provides 4 CO/PBX Loop Start CO Lines which support pulse/DTMF signal. Each Interface
contains ring and loop current detection circuits, A/D and D/A conversions, and pulse and ground flash
signaling circuit. LCOB contains 4 LEDs to indicate the in use status of each CO line.
RJ21 type male connector is mounted on the front edge of the LCOB for the connection to lines.
LCOB can be optionally equipped with up to 4 Call Metering Units (CMU) to monitor call charge, a Call
Progress Tone Unit (CPTU) to detect call progress tone and a DTMF Receiver Unit (DTRU) to detect
DTMF signal.
A CMU supports call metering function and can be installed on each line. And the appropriate type of
CMU should be installed on the line according to the national specification.
Each CPTU contains two tone detection circuits that are time shared under software control as system
resources. These detectors are used in support of several features such as ACNR. If such features are to
be used, it is recommended that at least one CPTU be provided for every LCOB. According to sensitivity
of tone detector, two types of CPTU (CPTU/A, CPTU/B) are available. CPTU/A has wide tone detection
range(305Hz~640Hz) and CPTU/B has narrow tone detection range (350Hz, 620Hz, 440Hz, 480Hz±1%).
LCOB can be installed in the universal slot No. 1-6 in any KSU.
Add-on boards: DTRU, CPTU/A, CPTU/B, CMU50PR/CMU12PR/CMU16
2.4.9.2 LCOB8 (Loop Start Co Line Interface Board with 8 Ports)
LCOB8 provides 8 CO/PBX Loop Start CO Lines which support pulse/DTMF signal. LCOB8 contains 8
LEDs to indicate the use of each CO line.
RJ21 type male connector is mounted on the front edge of the LCOB8 for the connection to lines.
LCOB8 can be optionally equipped with up to two Call Metering Units (CMU4) to monitor call charge, a
Call Progress Tone Unit (CPTU4) to monitor call progress tone and a DTMF Receiver Unit (DTRU4) to
detect DTMF. A CMU4 supports 4 channels call metering function. And the appropriate type of CMU4
should be installed on the line according to the national specification. A CPTU4 contains 4 tone detection
circuits that are time shared under software control as system resources. These detectors are used in
supporting several features such as ACNR. If such features are to be used, it is recommended that
CPTU4 should be provided for every LCOB8. According to sensitivity of tone detector, CPTU4 has wide
tone detection range(305Hz~640Hz).
