AC4830xC-C Data Book
Chapter 2. Functional Description
Revision 1.0
21
March 2000
2.2.5 Channel Associated Signaling Port
The Channel Associated Signaling (CAS, E&M) port is an external parallel port used
for signaling transfer between the AC4830xC-C and the Telephony Interface. This
external CAS port is connected to the AC4830xC-C via the SRAM’s low-order, 8-bit
data bus.
The signaling channel uses E&M (A and AB) signaling.
The CAS Port signals are shown in Figure
2-7 below:
Figure
2-7: AC4830xC-C CAS Port Interface
The low ‘nibble’ (4-bit sub-field) of the signaling sample contains the E&M AB
signaling where the B bit is located in the Least Significant Bit within the sample, as
shown in Figure
2-8, below.
The E&M ‘A’ represents 1-bit signaling information for each AC4830xC-C channel,
and the E&M ‘AB’ represents 2-bit signaling.
Figure
2-8: E&M AB Signaling
Bit Number
Device
7
6
5
4
3
2
1
0
AC48301C-C - 1 channel
B
A
AC48302C-C - 2 channels
B
2
B
1
A
2
A
1
HPI
AC4830xC-C
VOICE
Interface
MEMORY
& I/O
Interface
TAP
A
A
1
2
2
1
B
B
CAS
(E&M)
Port
Содержание AC4830 C-C Series
Страница 2: ......
Страница 12: ...AudioCodes Ltd AC4830xC C VoPP 10 Catalog Number LTRT 00060 Reader s Notes...
Страница 58: ...AudioCodes Ltd AC4830xC C VoPP 56 Catalog Number LTRT 00060 Figure 4 2 Interface Application Driving a Codec...
Страница 60: ...AudioCodes Ltd AC4830xC C VoPP 58 Catalog Number LTRT 00060 Reader s Notes...