Specifications

XMU+ Installation and Maintenance Guide rev.07 147
Dual Tone Multi Frequency (DTMF)
A telephone’s touch tone system uses pairs of
tones to represent the various keys. There is a
“low tone” and a “high tone” associated with
each button (0 through 9, * (star), and #
(pound)).
The XMU+ uses a DTMF node to identify the
unique tones pressed by a caller on a touch-
tone telephone and route the call accordingly.
See
Typical Uses for XMU+ on page 7 for
more information.
Ethernet
Ethernet is a popular Local Area Network
(LAN) type originally introduced by Xerox
and now supported by an IEEE standard.
Ethernet uses a Carrier Sense Multiple Access
/ Collision Detect (CSMA/CD) technique to
accommodate multiple devices on a common
medium such as twisted pair cable. The
XMU+ Control Card network port is an
Ethernet port. It supports data transfer at 10
or 100 Mbps (less control “overhead”).
Hot Swap
Cards with hot swap capability can be
changed while the XMU+ system is
operating. Line cards and power supply cards
are hot swap types. For line cards, only those
channels connected to the card to be
removed and replaced are disrupted (or need
to be taken out of service). Power supply
cards can be swapped with no disruption to
system operation so long as there is a second
(redundant) power supply card.
Hybrid Analog
A hybrid analog line card incorporates both
passive (ring detect, start signal detect,
control pulse) and interactive (DTMF detect)
announcement functionality.
Lines
Lines are the telephone lines (extensions)
that can connect to the XMU+.
Link Indicator
The link indicator is associated with the
network (Ethernet) port on the Control Card.
This indicator is on when the port is
connected to an active Ethernet network.
Loop Current
For PSTN lines and certain PBX equipment
types, the current that flows in the audio pair
when the terminal equipment (XMU+ line
card port) is off hook is detected and used for
control purposes.
Low Impedance
The Low Impedance card is a variant of the
hybrid analog line card specially equipped to
drive audio and signaling to 24 RAN
(Recorded Announcement) ports in parallel
on Nortel Meridian PBX equipment.
Memory Module
Memory Modules reside on the Control Card,
and provide working and non-volatile
memory storage for messages and
configurations within the XMU+. Memory
Modules are replaceable and upgradeable.
See
Upgrading Control Card Memory on
page 116.
Mini Weather Radio (MWR)
The MWR line card is used for Environment
Canada weather broadcasting applications.
See
Line Cards Supported by XMU+ on
page 5.
Modem
A device for transferring digital data over
analog telephone lines. Modem is the