Preliminary Information
Pin Description (Continued)
Pin #
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Name
NC
NC
RF1
RF2
RGV
RG1
NC
NC
RC2
LR2
VDD
GND
VEE
VX2
LCS2
SHK2
VR2
ESE2
ESI2
GND
DCRI
VBAT
RING2
TIP2
Description
No Connection.
This pin should not be connected.
No Connection.
This pin should not be connected.
MH88622
Ringing Frequency Node 1 (Input).
A capacitor is connected between RF1 & RF2 and
determines the frequency of the ringing generator.
Ringing Frequency Node 2 (Input).
Two capacitors are connected between RF1& RF2
and from RF2 to AGND. This determines the frequency of the ringing generator.
Ringing Gain Voltage.
Connects to RG1 through a resistor to reduce the output ringing
voltage. When left open circuit output ringing voltage is 90Vrms.
Ringing Gain Node 1.
Connects to RGV through a resistor to reduce the output ringing
voltage. When left open circuit output ringing voltage is 90Vrms.
No Connection.
This pin should not be connected.
No Connection.
This pin should not be connected.
Ringing Control (Input).
A logic level applied to this pin enables ringing to be applied
across Tip and Ring of subscriber 2.
Line Reversal.
A logic 1 applied to LR2 will reverse the “Tip” and “Ring” to subscriber 2.
This pin has an internal pull down.
Positive Supply Voltage.
+5Vdc. This pin should be connected to pin 14 of the hybrid on
the PCB.
Ground.
Return path for VDD, VEE, VBat & DCRI. This pin should be connected to pins 5,
13 & 36 of the hybrid on the pcb.
Negative Supply Voltage
.
-5Vdc. This pin should be connected to pin 12 of the hybrid on
the PCB.
Transmit (Output).
4-Wire GND referenced audio input for subscriber 2.
Loop Current Set 2.
Logic 1 gives ILoop = 40mA, Logic 0 gives ILoop = 25mA.
Off Hook Indication (Output).
A logic high output indicates when subscriber 2 equipment
has gone off hook.
Receive (Input).
4-Wire GND referenced audio input for subscriber 2.
External Signal Enable (Input).
The external signal to subscriber 2 is controlled by a logic
level applied to this pin.
External Signal Input.
A continuous signal should be applied to this pin which will be
switched to “Tip” and “Ring” of subscriber 2.
Ground.
This pin should be tied to pins 5, 13 & 28 on the PCB.
DC Ringing Voltage Input.
A continuous 120Vdc is applied to this input to achieve 90
Vrms ringing. This should be connected to pin 4 of the hybrid on the PCB.
Battery Voltage.
Typically -48V dc is applied to this pin. This should be connected to pin 3
of the hybrid on the PCB.
Ring Lead.
Connects to the “Ring” lead of subscriber line 2.
Tip Lead.
Connects to the “Tip” lead of subscriber line 2.
2-175
MITEL [ MITEL NETWORKS CORPORATION ]
