MH88622
Preliminary Information
TIP1
RING1
VBAT
DCRI
GND
ESI1
ESE1
VR1
SHK1
LCS1
VX1
VEE
GND
VDD
LR1
RC1
NC
NC
RF1
RF2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
RGV
RG1
NC
NC
RC2
LR2
VDD
GND
VEE
VX2
LCS2
SHK2
VR2
ESE2
ESI2
GND
DCRI
VBat
RING2
TIP2
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
TIP1
RING1
V
BAT
DCRI
GND
ESI1
ESE1
VR1
SHK1
LCS1
VX1
VEE
GND
VDD
LR1
RC1
Description
Tip Lead.
Connects to the “TIP” lead of subscriber line 1.
Ring Lead.
Connects to the “RING” lead of subscriber line 1.
Battery Voltage.
Typically -48V dc is applied to this pin. This should be connected to pin 38
of the hybrid on the PCB.
DC Ringing Voltage Input.
A continuous 120V dc is applied to this input to achieve
90Vrms ringing. This should be connected to pin 37 of the hybrid.
Ground.
This pin should be tied to pins 13, 28 & 36 on the PCB.
External Signal Input (Input).
A continuous signal should be applied to this pin which will
be switched to “Tip” and “Ring” of subscriber 1.
External Signal Enable (Input).
The external signal to the subscriber 1 is controlled by a
logic level applied to this pin.
Receive (Input).
4-Wire GND referenced audio input for subscriber 1.
Off Hook Indication (Output).
A logic low output indicates when subscriber 1 equipment
has gone off hook.
Loop Current Set 1.
Logic 1 gives I
Loop
= 40mA, Logic 0 gives I
Loop
= 25mA
Transmit (Output).
4-Wire, GND referenced audio output for subscriber 1.
Negative Supply Voltage.
-5Vdc. Connects to pin 29 of the hybrid on the PCB.
Ground.
Return path for VDD, VEE, VBat & DCRI. This pin should be connected to pins 5,
28 & 36 of the hybrid on the PCB.
Positive Supply Voltage.
+5Vdc. Connect to pin 27 of the hybrid on the PCB.
Line Reversal.
A logic 1 applied to LR1 will reverse the “Tip” and “Ring” to subscriber 1.
This pin has an internal pull down.
Ringing Control (Input).
A logic level applied to this pin enables ringing to be applied
across Tip and Ring of subscriber 1.
2-174
MITEL [ MITEL NETWORKS CORPORATION ]
