what is diffrence between analog card and digital card in
plc.how analog card work,Please explain in detail.Please
send it on abhi_vyas@sify.com
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Answer Posted / srinivas.v
Analog Cards
Digium® analog cards were created for connecting analog
telephones and analog POTS (Plain Old Telephone System)
lines to the PSTN through a PC. With these cards, users can
transport calls from POTS to POTS, POTS to PBX, or POTS to
VoIP. Using one of our analog cards in concert with Digium's
Asterisk® software, standard PC platforms, and the Linux®
OS, one can create telephony solutions capable of satisfying
the needs of business applications with industry-leading
quality. Digium's analog cards utilize patent pending
VoiceBus™ technology. VoiceBus technology allows these cards
to use an industry standard, bus-mastering interface as
found in millions of PCs worldwide. VoiceBus maximizes
system compatibility and prevents system conflicts.
Digital Cards
Digium digital cards are high-performance, cost effective,
digital telephony interfaces. Digium digital cards in the TE
series support both E1 and T1 environments. The environments
are selectable on a per-card or per-port basis. This feature
enables signaling translation between E1 and T1 equipment,
and allows inexpensive T1 channel banks to connect with E1
circuits. The bus-mastering TE cards improve I/O speed over
slave-only architectures, resulting in reduced CPU usage and
increased card density per server. The cards provide the
power to interconnect traditional telephony systems (legacy
PBX) with emerging Voice-over IP (VoIP) technologies.
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