MH88422
Preliminary Information
VDD
IC
AGND
IC
LC
IC
RVLC
IC
IC
IC/NP
VX
IC/NP
VR
1
2
3
4
5
6
7
8
9
10
11
12
13
26
25
24
23
22
21
20
19
18
17
16
15
14
TIP
IC
RLS
IC/NP
IC
IC/NP
TF
NP
TXIN
IC
RING
NP
IC
Figure 2 - Pin Connections
Pin Description
Pin #
1
2, 4, 6,
8, 9
3
5
7
10, 12
11
13
14, 17
15, 19
16
18
20
21, 23
24
25
26
Name
VDD
IC
AGND
LC
RVLC
IC/NP
VX
VR
IC
NP
RING
TXIN
TF
IC/NP
RLS
IC
TIP
Positive Supply Voltage.
+5V.
Internal Connection.
This pin is cropped short.
Analog Ground.
4-Wire Ground. Normally connected to System Ground.
Loop Control (Input).
A logic 0 activates internal circuitry which provides a line
termination across Tip and Ring. Used for seizing the line and dial pulsing.
Ringing Voltage and Current Detect (Output).
Indicates the status of loop current
and ringing voltage.
Internal Connection or No Pin Fitted.
This pin is either cropped short or not fitted,
depending on the variant. See Note 1
Transmit (Output).
Analog output to modem/fax chip set.
Receive (Input).
Analog input to modem/fax chip set.
Internal Connection.
This pin is cropped short.
No Pin Fitted.
Ring Lead.
Connects to the "Ring" lead of a telephone line.
Dummy Ringer Connection.
Connects to the "Ring" lead of a telephone line through a
dummy ringer capacitor.
Tip Feed.
Connects externally to the RLS pin.
Internal Connection or No Pin Fitted.
This pin is either cropped short or not fitted,
depending on the variant. See Note 1
Ringing Loop Sense.
Connects externally to the TF pin.
Internal Connection.
This pin is cropped short.
Tip Lead.
Connects to the "Tip" lead of a telephone line.
Description
Notes:
1. Variant 1, 4 BD-1 - pins 10,12, & 21 are cropped short. Pin 23 is not fitted.
2. Variant 2 - pin 23 is cropped short. Pins 10, 12 & 21 are not fitted.
3. Variant 3 - pins 12 and 21 are cropped short. Pins 10 and 23 are not fitted.
2-14
MITEL [ MITEL NETWORKS CORPORATION ]
