INSTALLATION
CELP VOICE
CHANNEL
SIGNALING
The CELP Voice Channel Module supports 4-wire voice with two-state
E&M signaling only. The five major E&M signaling systems (E&M
types I-V) are supported. For the United Kingdom, SSDC5A is supported.
As previously mentioned, the CELP Voice Channel Module provides two-
state signaling only. An "M" Lead input produces an "E-lead" output at
the remote multiplexer channel. The M-signal input into the base card
will vary according to the signaling type selected. The base card is op-
tioned for the appropriate signaling type using jumpers as shown in
Table 2-3.
Type I signaling is generally used to interface to Signaling And Termi-
nating Equipment (SATE).
The E-lead output from the CELP Voice Channel Module is a solid-state
FET (field effect transistor) switch with a low resistance signifying a
busy condition. In order to read the busy state of the E-lead to station
ground, the external equipment (SATE, PBX channel, etc.) must be con-
nected as the voice channel switching circuitry is powered by the external
equipment (via the E-lead).
M-Lead Signaling interface diagrams can be found in Appendix C.
TABLE 2-3. OPTION SELECTIONS, M-SIGNALING TYPES
Signaling
Jumper Positions
M-Signaling States
Type
X1
X2
X3
X4, X9
Idle
Busy
Application
I
GND
M
GND
U.S.
0 Vdc
–12 to –48 Vdc
X1, X2, X3, X4 and X9 select
II
GND
M
BAT
U.S.
OPEN
–12 to –48 Vdc
the proper interface for dif-
III
GND
M
BAT
U.S.
0 Vdc
–12 to –48 Vdc
ferent E&M signaling types.
IV
M
BAT
GND
U.S.
OPEN
0 Vdc
The jumper positions de-
V
M
BAT
GND
U.S.
OPEN
0 Vdc
pend on the E&M signaling
II *
M
INT
INT
U.S.
OPEN
0 Vdc
types used by the voice
SSDC5A
M
BAT
GND
U.K.
OPEN
0 Vdc
equipment connected to the
CELP Module .
* For back-to-back signaling using no external battery.
Note 1: AT&T signaling types II through V require an external –48 volt supply to be connected to the Negative Battery (NBATT) input pin.
Note 2: Signaling types I, IV, V and SSDC5A require a local ground to be used for the return lines of either the E or M leads. This could be achieved
by adding a jumper in X3 (INT position); alternatively, a more reliable way is to externally connect the local Station Ground to the SG pin on the
multiplexer. All other signaling types require the local station ground to be connected externally to the SG pin on the multiplexer.
Note 3: Type II signaling (back-to-back) requires signaling connections between the back-to-back CELP Modules (as shown in the table below):
LOCAL
CELP
VOICE
CHANNEL
MODULE
REMOTE
CELP
VOICE
CHANNEL
MODULE
LOCAL
CELP
VOICE
CHANNEL
MODULE
REMOTE
CELP
VOICE
CHANNEL
MODULE
SB
SG
TIP IN
TIP OUT
SG
SB
RING IN
RING OUT
KEY
E
M
TIP OUT
TIP IN
SB-STATION BATTERY
M
E
RING OUT
RING IN
SB-STATION GROUND
2-5
