APPENDIX E
TABLE 2. CELP VOICE CHANNEL MODULE CONNECTOR PIN ASSIGNMENTS,
DB-25 OUTPUT CONNECTOR
Pin No.
Signal Name
Description
1
CHASSIS GROUND
—
2
- BATTERY (INPUT)
–12 V dc to –48 V dc voltage supply for types II, III, IV and V M-Lead
interface.
3
M-LEAD
Pulse signal input to the CELP Voice Channel Module drives the M-lead sen-
sor circuit.
4
TIP OUT
Analog output. Part of the VF TIP and RING output pair.
5
RING OUT
Analog output. Part of the VF TIP and RING output pair.
6
DISABLE
Not used
7
GROUND
Signal Ground
8
STATION GROUND (SG)
Station Ground provides a reference level for the E&M signal interface.
9
—
No connection on Voice Channel Card.
10
RING IN
Analog Input. Part of the VF TIP and RING input pair.
11
E' LEAD
Not Used
12
—
No connection on Voice Channel Card.
13
—
No connection on Voice Channel Card.
14
—
No connection on Voice Channel Card.
15
STATION BATTERY (SB) Provides a current limited station battery (–12 to –48 V dc sourced from Pin
55) on the CELP VOICE CHANNEL MODULE base card when configured for a
Type II or III interface. For types I, IV or V, station ground is provided on the
SB lead.
16
—
No connection on Voice Channel Card.
17
STATION BATTERY (SB) Provides a current limited station battery (–12 to –48 V dc sourced from Pin
55) on the CELP Voice Channel Module base card when configured for a Type
II or III interface. For types I, IV or V, station ground is provided on the SB
lead.
18
—
No connection on Voice Channel Card.
19
—
No connection on Voice Channel Card.
20
—
No connection on Voice Channel Card.
21
—
No connection on Voice Channel Card.
22
—
No connection on Voice Channel Card.
23
—
No connection on Voice Channel Card.
24
E-LEAD
Switch on indicates Busy circuit (DC voltage between pins 24 and 8). Switch
off indicates Idle circuit (0 V dc between pins 24 and 8).
25
TIP IN
Analog Input. Part of the VF TIP and RING input pair.
E-3
