Aiphone N-20AS User Manual

The N-20AS and N-40AS add-on selectors are designed to function with the NEM Lamp Memory System, Type 
"C" or later. Multiple add-on selectors can be added to a master station along with a variety of sub stations to 
create a communication system tailored to a user's needs. All standard NEM system accessories can be used in 
conjunction with the add-on selectors. Each add-on selector requires a dedicated 24V DC power supply.

Pg. 1

NAMES & FUNCTIONS:
1.  OFF button
2.  Selector button
3.  OFF LED
4.  Directory card
5.  Station selector LED  

SPECIFICATIONS:
Power Source:

24V DC.  Use PS-2420UL.

Communication Output: 500mW at 20 ohms
Communication:

Push-to-talk, release-to-listen (TALK button), or VOX handset at master (handset models only).
Hands free at sub station.

All call output:

6W in a system of up to 20 sub stations
12W in a system between 21 and 40 stations.

Calling:

Master to sub:   By voice only after pretone.
Sub to master:  Call button on sub activates tone and LED, remaining activated until answered. 

Wiring:

2 conductors homerun to sub station, or loop multi-conductor cable with 1 common wire  
plus 1 individual wire per sub station on the wire run.  
Shielded cable is recommended. Use Aiphone #822202 (22AWG) or #821802 (18AWG) 2 cond. 
Multiconductor: Aiphone #822210 (10 cond.), #822215 (15 cond.), #822220 (20 cond.)

Wiring Distance:

420' with 22AWG; 1,000' with 18AWG. 

Individual Components for System:
NEM-n      Master station (10, 20, 30, 40-call sizes) 
NEM-nA

Master station with handset (10, 20, 30, 40-call sizes)

NA-series

Any sub station with NA, NB, or NE model number prefix 

PS-2420UL 24V DC, 2A Power Supply
Other Accessory items listed in catalog or price list as compatible with the NEM series.

1

2

5

4

3

N-nAS TERMINAL DEFINITIONS:
+

Positive 24V DC

-

Negative

1~40

Station number

E

Common communication

V1-V4 Connects to NB-U for 
A1-A4 Background Music

0108