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RAD
DV-MUX3
Adaptive Multiplexer for
Voice, Fax and Data |
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- DV-MUX3 is an adaptive
TDM Multiplexer, integrating one or two voice/fax
channels together with one synchronous data channel
onto a dial-up modem or digital link.
- The voice channels
provide high quality voice compression using the
MPMLQ voice digitizing algorithm, at selectable
rates of 4.8, 6.4, 7.2, 9.6 or 12.8 kbps. Toll
quality voice reproduction (compatible to ADPCM at
32 kbps) is guaranteed when using rates of 6.4, 7.2,
9.6 or 12.8 kbps.
- Each compressed voice
channel is available with one of the following
interfaces (see Ordering):
- 2-wire FXS for
direct connection to a telephone set
- 2-wire FXO for
connection to a PABX extension line
- 2-wire, 4-wire
E&M interface.
- In-band fax support is
available for Group III fax machines and complies
with T.4 and T.30 standards.
- For applications
requiring low delay, such as IBM SNA sessions,
DV-MUX3 ensures that the minimal required bandwidth
is always available, even in adaptive mode (see
Figure 2).
- The synchronous data
channel operates at rates up to 252.8 kbps. The
actual rate depends on the data rate of the main
link, and on whether the operating mode is adaptive
or non-adaptive. In the adaptive mode, the bandwidth
is allocated to the voice and data channels
dynamically, with the data channel receiving
additional bandwidth when the voice channel is
"idle" (telephone on-hook). In the
non-adaptive mode, each channel is allocated a fixed
bandwidth.
- Each compressed voice
channel is equipped with an integral echo canceller
for canceling the near end hybrid echo. The module
is also equipped with forward error correction for
checking the most vital speech information bits (at
7.2 and 9.6 kbps), thus maintaining voice quality
even at a channel bit error rate of 1 x 10-3.
- Status indicator LEDs
include: transmit and receive data (selectable for
link, data or voice channels), sync loss, test and
power. The LEDs also provide configuration error
indication.
- Diagnostics include
remote loopback for each channel, BER test for data
channel and tone injection for the voice channels.
- The dial-up mechanism
for PSTN applications activates the DTR signal to
the modem only if the voice channel is in the
"off-hook" state, or if the DTR of the
data channel is active.
- Two DV-MUX3 units (1U
high each) can fit side-by-side in a 19" rack.
- DV-MUX3 works only
opposite another DV-MUX3 unit (not compatible with
DV-MUX or DV-MUX2).
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