MH88632B Datasheet, PDF (7/17 Pages) Mitel Networks Corporation – Central Office Interface Circuit Preliminary Information

Preliminary Information
MH88632B
R1
K2A
48V Battery
R2
K2B
MH88632B
+5V
Tip
Ring
Protection
Circuit
1
TIP
2
RING
R3
K3
+5V
K1
K2
K3
Loop relay Control
Bias Relay Control
Ground Relay Control
K1A
K1B
13
LRD
14 _BRD
8
GRD
12
VRLY
11
RGND
15
LRC
16
BRC
17
GRC
3
XLA
4 _XLB
5 _XLC
6 _XLD
40
VCC
28
GTX1
27
GTX0
25
TX
GRX1 ³⁰
29
GRX0
26
RX
Z1 ²³
Z600 ³²
33
NS
34
TG
35
RL
36
RV
37
FL
RG ³⁸
NOTES:
1) Configured for 0dB Gain, 600Ω Input Impedance
and 600Ω Network Balan ce Impedance
2) K1, K2 are E/M FORM C
3) K3 is E/M 1 FORM C
4) R1 = R2 = 30.9kΩ, 1%, 5W
5) R3 = 470Ω, 5%, 5W
6) K2, K3, R1, R2, R3 are required for Ground Start only
7) C1, C2 are decoupling capacitors
AGND VEE
18 _C2 39
-5V
C1
Analog Out
Analog In
Tip Ground Detect
Reverse Loop Detect
Ringing Voltage Detect
Forward Loop Detect
Ring Ground Detect
Figure 3 - Typical Combined Loop Start and Ground Start Appliation Circuit
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