Instruction manual

The FXO and FXS options are usually operated in a link, with the FXO interface
at the PABX side, and the FXS interface on the subscriber’s side. In addition, two
FXS interfaces can also be operated in a link, to provide PLAR (Private Line with
Auto-Ring) telephone service.
The E&M interface is usually used to connect trunk lines of two PABXs. In this
case, two E&M interfaces are operated in a link. The E&M interface can be also
used to connect the subscriber side to a PABX E&M trunk interface. In this case,
the E&M interface is used on the PABX side and the FXS interface on the sub-
scriber side. The interface option can be independently selected for each voice
channel, and each channel has its own eight-pin RJ-45 connector.
Data Channel Features The DV-MUX3 data channel provides a synchronous channel. The electrical inter-
face of the data channel is user-selectable (X.21, V.35, V.36/RS-449, RS-530, or
RS-232). The data channel is terminated in a 15-pin D-type female connector,
wired in accordance with ITU-T Rec. X.21. When a different interface is selected,
an appropriate adapter cable (available from RAD) must be inserted between the
DV-MUX3 and the cable connecting to the user’s equipment.
The data channel can operate at rates of 0.8 to 252.8 kbps, depending on the se-
lected mode, and the main link data rate. Note that when the RS-232 interface is se-
lected, the maximum data rate is limited by the electrical characteristics of this in-
terface, which usually cannot work above 64 kbps.
The data channel interface is configured as a DCE, that is, it provides timing sig-
nals to the user’s equipment: the receive and transmit timing is derived from the
main link clock.
The data channel is transparent to user’s data. The control lines generated by the
data channel interface are Carrier Detect (CD) and Clear to Send (CTS). For the
RS-232 interface, the DSR line is also provided. Those lines are asserted when the
DV-MUX3 is operating normally (i.e., when the configuration is valid, the DV-
MUX3 is synchronized, and the channel is not being tested). For interfaces other
then RS-232, the CD line can be externally connected to the DSR line to enable op-
eration of terminal equipment that needs DSR in active, e.g., IBM equipment.
The channel interface does not include control lines for hardware flow control,
therefore when the user’s application requires flow control, the user’s equipment
must use software flow control.
Main Link
Characteristics
The electrical interface of the main link is user-selectable (X.21, V.35, V.36/RS-449,
RS-530, or RS-232). The main link is terminatedina15-pin D-type femaleconnector,
wired in accordance with ITU-T Rec. X.21.
When a different interface is selected, an appropriate adapter cable (available from
RAD) must be inserted between the DV-MUX3 and the cable connecting to the
data communication equipment (e.g., the modem) serving the main link. Note that
the main link interface can be selected independently of the data channel interface,
therefore interface conversion is available on the data channel.
The DV-MUX3 can operate at main link rates of 9.6 to 256 kbps (or up to about 64
kbps, when the selected interface is RS-232). The interface is configured as a DTE,
that is, it requires clock signals for both the receive and transmit paths from the
equipment to which it is connected.
FUNCTIONAL DESCRIPTION
DV-MUX3 Installation and Operation Manual 1-3