NEC Xen Master Programming Manual page 142

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The Ring Patterns are listed in the table below:
Pattern
Tone
Off
Tone
On
A
B
C
D
E
G
H
1 - 124
0s
Line
Key
LK 1
LK 2
LK 3
LK 4
LK 5
LK 6
LK 7
F LK 8
LK 1
(Pg. 2)
LK 2
(Pg. 2)
3s
2s
1s
Xen Master & Xen Axis
s= seconds
6s
4s 5s
Intercom Ring Pattern Selection