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Ta b l e 3 - 1 0 . T E L C O I n t e r f a c e S p e c i fi c a t i o n s
S p e c i fi c a t i o n
T E L C O
P a r a m e t e r
M a k e / B r e a k R a t i o s ( S e l e c t a b l e )
6 0 / 4 0 m s
6 5 / 3 5 m s
7 1 / 2 9 m s
P u l s e D i a l R a t e
9-11 pps
S t a n d a r d T o n e
Groupings
(2.5 dB max. separation)
D T M F
- 6 / - 8 d B m
- 9 / - 1 1 d B m
- 1 0 / - 1 2 d B m
D T M F L e v e l s ( S e l e c t a b l e )
Interdigital Pause
7 2 0 m s
1 0 0 0
m s
Frequency Response Bandwidth
3 0 0 - 3 0 0 0 H z
S e n d L e v e l ( d a t a )
- 9 d B m
M i n i m u m R e c e i v e L e v e l
- 4 3 d B m
AC Impedance (On Hook)
4 7 K o h m ( 0 - 4 0 0 0 H z )
Line Termination Impedance
( S e l e c t a b l e )
6 0 0 o h m
9 0 0 o h m
Longitudinal Balance Frequency
2 0 0
H z
5 0 0
H z
1 0 0 0 H z
2 5 0 0 H z
4 0 0 0 H z
O n H o o k
8 2 d B
8 1 d B
8 0 d B
7 9 d B
7 9 d B
O f f H o o k
7 6 d B
7 4 d B
7 4 d B
7 5 d B
6 9 d B
Ringer Sensitivity
2 0 - 1 4 0 V r m s
Ring Detect Frequency Range
Low Frequencies
High Frequencies
1 4 - 2 5 H z
5 0 - 6 8 H z
TELCO/Low Voltage Separation
4 m m
C o n n e c t i o n M e t h o d
R J - 1 1
3 - 1 2
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