MH88632B データシートの表示（PDF） - Mitel Networks
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MH88632B Datasheet PDF : 17 Pages
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MH88632B
Preliminary Information
Input Impedance Settings
Z2
Z1
Z600
Z900
Resulting input impedance (Zin)
NA
Connect Z1 to Z600
NA
600Ω
NA
Connect Z1
NA
Connect Z1
to Z900
to Z900
900Ω
Connect network from Z1 to Z2
NA
NA
0.1 x impedance between Z1 & Z2
Note: NA indicates high impedance (10kΩ) connection to this pin does not effect the resulting Input Impedance
Network Balance Settings
NS (Input)
N2
N1
NATT
Resulting input impedance (Zin)
Low
NA
NA
NA
Equivalent to Zin
High
NA
Connect N1 to NATT
AT&T compromise (350Ω + 1kΩ // 210nF)
Zin must be 600Ω
High
Connect network from N1 to
NA
AGND equivalent to 10 x
NETBAL. Connect network
from N1 to N2 equivalent to 10
x Zin.
0.1 x impedance between N1 & N2
Notes: NA indicates high impedance (10kΩ) connection to this pin does not effect the resulting Network Balance Impedance.
Low indicates Logic 0.
High indicates Logic 1.
Transmit Gain Programming
Transmit
Gain (dB)
RTX Resistor
Value (Ω)
Notes
+6.0
No Resistor
+4.0
38.3k
Results in 0dB overall gain when used with Mitel A-law codec (i.e. MT8967)
+3.7
32.4k
Results in 0dB overall gain when used with Mitel µ-law codec (i.e. MT8966)
0.0
GTX0 to GTX1
-3.0
5.49k
-6.0
3.32k
-12.0
1.43k
Note: Overall gain refers to the receive path of PCM to 2-Wire.
Receive Gain Programming
Receive
Gain (dB)
RRX Resistor
Value (Ω)
Notes
+6.0
No Resistor
0.0
GRX0 to GRX1
-3.0
5.49k
-3.7
4.87k
Results in 0dB overall gain when used with Mitel A-law codec (i.e. MT8967)
-4.0
4.64k
Results in 0dB overall gain when used with Mitel µ-law codec (i.e. MT8966)
-6.0
3.32k
-12.0
1.43k
Note: Overall gain refers to the transmit path of 2-wire to PCM.
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