MH88620IN
TIP
RING
TF1
TF2
RF1
RF2
LGND
LCA
VBAT
NC
RGND
VRLY
RRD
RNGC
NC
TRD
TRC
AGND
NC
N1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
N2
NC
Z1
Z2
TX
RX
GTX0
GTX1
GRX0
GRX1
NC
NC
NC
SHK
IC
IC
IC
IC
VEE
VDD
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Preliminary Information
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
21
Name
TIP
RING
TF1
TF2
RF1
RF2
LGND
LCA
V
Bat
RS1
RGND
VRLY
RRD
RNGC
RS2
TRD
TRC
AGND
NC
N1
N2
Description
Tip Lead.
Connects to the TIP lead of the subscriber line
Ring Lead:
Connects to the Ring lead of the subscriber line.
Tip Feed 1:
Access point for balanced ringing. Normally connects to TF2.
Tip Feed 2:
Access point for balanced ringing. Normally connects to TF1.
Ring Feed 1:
Access point for balanced ringing. Normally connects to RF2.
Ring Feed 2:
Access point for balanced ringing. Normally connects to RF1.
Battery Ground.
V
BAT
return path. Connected to system’s energy dumping ground.
Current Limit Set (Input):
The current limit is set by connecting an external resistor as
shown in Table 5. For 70mA default current, this pin is tied to -5V.
Battery Voltage:
Typically -48V dc is applied to this pin.
Ring Sense Resistor Connection 1.
See Figure 7a.
Ring Driver Ground Connection.
Relay Supply Voltage Connection
Ring Relay Drive (Output).
Connects to ring relay coil
Ring Relay Control (Input)
Ring Sense Resistor Connection 2.
See Figure 7a
Test Relay Drive (Output):
Connects to test relay coil.
Test Relay Control (Input).
Analog Ground:
V
DD
and V
EE
.
return path
No Connection:
Reserved.
Network Balance Node 1.
An external network balance impedance can be connected
between N1 and AGND. See Fig 4. for complex impedances. N2 no connection.
Network Balance Node 2.
See Fig 4. N2 connects to GND for 600Ω balance. N1 no
connection.
2-160
MITEL [ MITEL NETWORKS CORPORATION ]
