Instruction manual

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For a voice channel equipped with E&M interface, the channel control
signal generated by that channel indicates detection of an M signal. The
control signal received by that channel (E signal) indicates the reception
of subscriber off-hook at the remote FXS module or detection of the M
signal at the remote E&M module.
• Whenthe channel control signal at either end of the link is switched to the ac-
tive state, the DV-MUX3 immediately assigns the required bandwidth to the
voice channels, and reduces the clock rate supplied to the data channel. Note
that the DV-MUX3 always assigns the full bandwidth needed by voice chan-
nels. Therefore, for DV-MUX3 models equipped with two voice channels,
when both channels are enabled the DV-MUX3 assigns bandwidth for two
channels even if only one channel is active.
• Non-adaptivemode 1: the bandwidth required for the voice channels (as se-
lected by the user) is permanently assigned to these channels. The remaining
bandwidth, less the management and synchronization overhead, is available
to the data channel. This mode is mainly intended to allow the connection of
equipment that is capable of operating at non-standard data rates but cannot
tolerate the clock rate changes that occur routinely in the adaptive mode.
Such equipment can then use the highest available data rate, and thus achieve
the highest possible bandwidth efficiency.
• Non-adaptive mode 2: in this mode, the DV-MUX3 operates as a standard
TDM multiplexer, i.e., the bandwidth required for the voice channels is per-
manently assigned to these channels, and the data channeldatarate is a stand-
ard data rate (see Table 1-2) that can be transmitted within the remaining
main link bandwidth. This mode reduces somewhat the bandwidth effi-
ciency but allows the connection of data equipment designed for standard
data rates to the data channel.
User’s Interface All the DV-MUX3 operating parameters can be selected by the user, by means of
internal jumpers and switches.
Downloading To minimize setup time and to prevent configuration errors, the DV-MUX3 has a
master-slave configuration downloading facility. When this facility is used, all the
critical configuration parameters selected on the DV-MUX3 defined as the master
unit are downloaded through the main link to the slave DV-MUX3.
Configuration downloading is automatically performed when a link is established
between two DV-MUX3 units. This arrangement ensures the two units will always
use consistent configurations.
Diagnostics The DV-MUX3 has comprehensive diagnostic capabilities, which include:
• Power-up self-test.
• Internal BERT (bit error rate testing) facility, allows rapid evaluation of
transmission quality without requiring external test equipment.
• Tone injection allows evaluation of voice channel quality.
• Remote test loops activated by a front-panel switch.
FUNCTIONAL DESCRIPTION
DV-MUX3 Installation and Operation Manual 1-5