MH88631 Просмотр технического описания (PDF) - Mitel Networks
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MH88631 Datasheet PDF : 10 Pages
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MH88631
Preliminary Information
LPGND
1
VDD
2
RINGND
3
T
4
R
5
VTR-
6
VTR+
7
XC
8
XA
9
QE
10
AGND
11
RXIN+
12
RXIN-
13
VEE
14
TG
15
RC
16
RV
17
FC
18
RG
19
QB
20
XB
21
VEE
22
VDD
23
RXOUT
24
VCC+
25
GSR
26
TXIN-
27
VCC-
28
TXIN+
29
AGND
30
VR
31
VX
32
RGND
33
GSX
34
RC1
35
NETBAL
36
RD1
37
CD
38
RD2
39
RC2
40
Pin Description
Figure 2 - Pin Connections
Pin # Name
Description
1
LPGND Loop Ground is the system ground reference with respect to -48V.
2
VDD Positive Power Supply (+5V).
3 RINGND Ring Ground (Input). For Ground Start Trunk only a logic low input will enable the trunk
circuit to ground the Ring lead through a low resistance (390Ω). This is a signal to the C.O.
that the interface is seizing the line.
4
T
Tip (Input). Normally connects to the “Tip” lead of the C.O.
5
R
Ring (Input). Normally connects to the “Ring” lead of the C.O.
6
VTR- Connects to the TXIN+ (Pin 29) via an external capacitor (C1).
7
VTR+ Connects to the collector of an external transistor (Q1) and TXIN- (Pin 27) via an external
capacitor (C4)
8
XC
External relay contact (K1) connection from XB (Pin 21), activates by loop seize control
input (RC1).
9
XA
External relay contact (K1) connection from VTR+ (Pin 7), activated by loop seize control
input (RC1).
10
QE Connects to the emitter of an external transistor (Q1).
11
AGND Analog Ground.
12
RXIN+ Differential Receive (Input). Connects to analog ground via an external capacitor (C2).
13
RXIN- Differential Receive (Input). Connects to RXOUT (Pin 24) via an external capacitor (C3).
14
VEE Negative Power Supply. (-5V).
15
TG
Tip Lead Ground Detect (Output). Active low.
16
RC Reverse Loop Current Detect (Output). Active low.
17
RV
Ringing Voltage Detect (Output). Active low.
18
FC
Forward Loop Current Detect (Output). Active low
19
RG Ring Lead detect (Output). Active low.
20
QB Connects to the base of an external transistor (Q1).
2-226
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