Aria-130 Digital Key Telephone System
Issue: 1.2
Installation Manual
60
3.4.2 MPB Installation
The MPB is installed only in the MPB slot of the 1st KSU. The MPB may be equipped with 6 add-on
boards; PMU for software program, a MODU for modem access to the system, and a SDRAM for
software downloading and additional features. See Fig 3.4.2.
Lithium Battery
The MPB contains a lithium dry-cell battery to maintain memory and real-time clock functions. The battery
is soldered on the MPB, and connected circuitry by on-off DIPswitch. So the switch is set to ON position
before the MPB installation.
“ CAUTION: The system will not function properly if battery is incorrectly replaced. Replace
only with the same or equivalent type recommended by the manufacturer. Dispose
of used batteries
according to the manufacturers instruction.”
Figure 3.4.2 MPB, PMU and option board configuration
Function of LEDs
The 8 LEDs mounted in the MPB provide diagnostic information for states of the board. Table 3.4.1 LEDs
on the MPB shows the meaning of various states of LEDs.
LED No.
Meaning
LED1
Not used
LED2
Timer, Flashing every 100msec
LED3
Dial Processing , Flashing every 100msec
LED4
SLT Ring Processing, Flashing every 200msec
LED5
LCD active updating, Flashing every 300msec
LED6
Call Event Processing
LED7
RS-232C Tasking
LED8
Interrupt Processing
Table 3.4.1 LEDs on the MPB
RLY1 RLY2
PMU
CN1
CN2
DBID II
GSXD
CPU
DMEMU
SMEMU
PLLU
Serial port
PJ1
Ext. MOH
PJ2
Ext.
PAGE
SIU / MODU
ALARM
JTAG
connector
Battery
Switch
ARIA-130
LANU
