MH88600
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
ZN14
ZN13
ZN12
ZN11
ZN10
ZN9
ZN8
ZN7
ZN6
ZN5
ZN4
ZN3
ZN2
ZN1
TX
PG3
PG1
PG2
PG4
ZN0
Preliminary Information
VBat
RF1
RF2
RING
TIP
IC
GNDBat
TF2
TF1
GNDA
VEE
VDD
VRR
RC
RD
LCA
SHK
EGB
VRef
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
V
Bat
RF1
RF2
Name
No pin at this location.
Battery Supply Voltage (Negative).
Description
Ring Feed (1):
Connect to relay contact. See Figures 6 & 7.
Ring Feed (2).
Connect to relay contact. See Figures 6 & 7.
Connects to the “Ring” or “B” lead of the telephone line.
Connects to the “Tip” or “A” lead of the telephone line.
Internal Connection.
Battery Supply Ground (Positive):
Connect to System Ground
Tip Feed (2).
Connect to TF1 for unbalanced ringing, see Figure 6. Connect to relay
contact for balanced ringing, see Figure 7.
Tip Feed (1).
Connect to TF2 for unbalanced ringing, see Figure 6. Connect to relay
contact for balanced ringing, see Figure 7.
Analog Ground:
Normally connected to System Ground.
Negative Power Supply Voltage:
Normally -5V.
Positive Power Supply Voltage:
Normally +5V.
Ringing Relay Clamp Diode:
Connect to relay coil and to relay supply voltage
(Positive). For +5V relay, connect to VDD.
Ring Control (Input):
A logic high will activate the Ring Relay Drive if SHK is high.
Ring Relay Drive (Output).
Connect to relay coil. A logic low will activate the relay by
sinking current from VRR through the relay coil.
Loop Current Adjust (Input):
Loop current is proportional to the voltage at this input.
Normally connected to VRef
Switch Hook Detect (Output):
A logic low indicates an off-hook condition.
Earth Ground Button (Output):
A logic low indicates a grounded Ring lead condition.
Voltage Reference (Output):
Normally connected to LCA for default loop current.
RING
TIP
I/C
GND
Bat
TF2
TF1
GNDA
V
EE
V
DD
V
RR
RC
RD
LCA
SHK
EGB
V
Ref
2-84
MITEL [ MITEL NETWORKS CORPORATION ]
