Specifications

146 Glossary
Carrier Detect Indicator
The carrier detect indicator is associated
with the modem port on the Control Card.
This indicator should be lit during data
transfer by modem. It indicates that the local
modem has detected the remote modem's
carrier, which is a basic attribute of the data
transmission.
Channels
Channels are the virtual assignment of T1
lines within a cable into separate lines.
Designating channels gives XMU+ the ability
to use up to 24 lines on a T1 line card.
Chassis
The XMU+ large chassis provides flexible
configuration options for users requiring 2 to
64 analog ports (48 T1 ports), while the
XMU+ small chassis provides an effective
solution for users requiring 2 - 8 analog ports
(24 T1 ports).
See
Product Overview on page 4.
Collision Indicator
The collision indicator is associated with the
network (Ethernet) port on the Control card.
This indicator is on when a data collision on
the network is detected. Such collisions will
normally occur in Ethernet, but if too many
are indicated the network may have too much
traffic and/or too many devices on it. Such a
network problem could be solved by sub-
dividing the network with a switching hub.
Configurations
XMU configurations are composed of
commands, nodes, messages, and music that
are executed when a call is received.
Configurations are designed on XMUCOM+
software and then downloaded to the XMU+
unit.
See
About the XMU+ Announcement and
Call Processing System on page 3.
Control Pulse
A Control Pulse signal is provided to certain
types of PBX equipment by the XMU+. This
is used by those PBX types to detect the off
hook condition (instead detecting loop
current).
DS0
Digital Signal - Level Zero (0). In the digital
communications hierarchy, this is the
individual channel. The data rate is 64 Kbps
(the rate required to digitize a voice
message).
DS1
Digital Signal - Level One (1). In the digital
communications hierarchy, individual
channels are bundled into basic multi-
channel groups called DS1. In North
America, DS1 equates to T1 service (24
channels x 64 Kbps + 8 Kbps control = 1.544
Mbps). In Europe, DS1 equates to E1 service
(30 channels x 64 Kbps + 128 Kbps control =
2.048 Mbps)