KX-NS520UC - Panasonic PBX Service Manual (repair manual). Page 7

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The NS500 series PBX is constructed in Main Unit (NS500) and up to three expansion unit (NS520).
In Main Unit (NS500), CPU Board (MPR) (Master Processor)  which controlls whole call of this system is equipped, and, in an
expansion unit, CPU Board (SPR) (Slave Processor) controlling various line interfaces in the unit is equipped with.
Each expansion units are connected to Main Unit with star topology, and time slot exchange function is equipped in Main Unit.
The exclusive interface between basic and expansion units are built with one pair of TDM interface of 8.192MHz, and voice chan-
nel, control channel and addition information channel are secured.
All interface cards except digital extension intefarce (DHLC/DLC) are controlled by CPU Board (MPR)/CPU Board (SPR) directly.

Card

Description

CPU Board (MPR) 

Master CPU of NS500 system which controls Main Unit and up to three expansion unit. 

Main Unit Mother Board
(LCOT6+MCSLC16+DLC2)

Ext and Trunk combo card which support analog trunk (6ch), analog extension line (16ch) and digital exclusive
line (2ch).

Card

Description

CPU Board (SPR)

CPU Board (SPR) is a sub CPU card controlling the line card in the expansion unit.

Expansion Unit Mother Board
(MCSLC16)

Extension line card.

Extension

Trunk/DPH

BASE Card

CPU

SPI

MPR

CortexA8

300MHz

DDR3

128MB

NAND

256MB

SD Card

For debug

EXP-S

MCSLC16

S-lab

SLIC/CODEC

x8

Slave

FPGA

TD

M

B

u

s

CP

U

B

u

s

LED(1)

PLD1

Extension

(EXT_PLD)

Expansion Unit

(NS320/520)