Preliminary Information
MH88632B
K2A
K2B
R1
R2
48V Battery
+5V
MH88632B
C1
1
2
40
28
Tip
VCC
TIP
Protection
Circuit
Ring
RING
GTX1
27
25
GTX0
TX
R3
Analog Out
Analog In
K3
+5V
30
29
13
GRX1
GRX0
K1
K2
K3
LRD
BRD
GRD
14
8
26
23
RX
Z1
12
11
VRLY
RGND
32
15
16
17
Z600
NS
Loop relay Control
Bias Relay Control
LRC
BRC
GRC
33
34
Ground Relay Control
K1A
Tip Ground Detect
3
4
5
6
TG
RL
RV
XLA
XLB
XLC
35
36
Reverse Loop Detect
Ringing Voltage Detect
Forward Loop Detect
Ring Ground Detect
K1B
37
38
FL
RG
XLD
AGND
18
VEE
39
NOTES:
1) Configured for 0dB Gain,
600Ω Input Impedance
C2
and 600Ω Network Balan ce Impedance
2) K1, K2 are E/M FORM C
3) K3 is E/M 1 FORM C
-5V
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
Figure 3 - Typical Combined Loop Start and Ground Start Appliation Circuit
2-245
MITEL [ MITEL NETWORKS CORPORATION ]
