MH88625
Preliminary Information
MH88625
N2
21
MH88625
21
N2
N1
20
N1
20
19
NATT
NATT
19
33
NS
33
NS
VDD
Network balance is set to the input
Impedance (Z
in
)
Note:
Make connection between Z1 and other points as short as possible.
Network balance is set to the AT&T compromise
network (350Ω + 1000Ω // 210nF) impedance.
The input impedance must be set to 600W.
Figure 6 - Network Balance Setting with NETBAL equal to Z
in
or AT&T
MH88625
N2
21
10 x Z
in
N2
N1
20
10 x
NETBAL
19
NATT
CP
RP
N1
RS
(RS + 1)
NS
33
VDD
ZNetbal = 0.1 x
1/RP + S x CP
where S = j x w
and w = 2 x
Π
x f
Notes:
Example:
1) The 10xZin network must be set to 10 x the desired input impedance (Z
in
).
2) The network balance must be set to the desired network balance. See
section on network balance.
3) Make connection between Z1 and component as short as possible.
If RS = 2200Ω
,
RP = 8200Ω, CP= 11.5nf
Then the input impedance (Z
in
) is 220Ω in
series with 820Ω in parallel with 115nF.
Figure 7 - Network Balance Setting with NETBAL not equal to ZNetbal or AT&T
2-192
MITEL [ MITEL NETWORKS CORPORATION ]
