Nortel DMS-100 Series Maintenance Manual page 55

telephone lines to the home or small-office subscriber. The service provides
the following functionality:
• high bandwidth with line transport rates up to 1280 kilobits per second
(kbit/s) downstream and 320 kbit/s upstream
• simultaneous data and voice connection
• continuous data connection
• data traffic routed to data networks, which reduces congestion on the voice
switch
The 1-Meg Modem Service uses a digital subscriber line (DSL) technology to
provide the increased bandwidth with current office equipment and the
subscriber loop. In this document, the term xDSL refers to all the different
DSL technologies.
Components
The 1-Meg Modem Service includes the following components:
• The 1-Meg Modem is customer premises equipment (CPE) that connects
the telephone line, extension telephone, and computer. To the subscriber,
the modem installs like a regular voice band modem, except the modem
uses a 10BaseT Ethernet connection to the computer. Voice and data
circuits are kept separate on the loop. This separation allows simultaneous
voice and data traffic with no impact to other telephony features.
• The xDSL line card (xLC) replaces the subscriber's line card in an existing
Star Hub drawer. The card provides full voice service in parallel with high
speed data communication with the 1-Meg Modem.
• The data-enhanced bus interface card (DBIC) replaces the existing bus
interface card (BIC) in the existing Star Hub line drawer. The card is as a
concentrator for the voice and data connections within a single line drawer.
The card also separates the voice and data traffic for routing to the correct
networks.
• The xDSL Element Management System (xEMS) provides operations,
administration, maintenance, and provisioning (OAM&P) functions from
a Hewlett-Packard (HP) or Sun workstation. Based on HP OpenView, the
xEMS is a graphical user interface (GUI) that uses icons and pull-down
menus. Refer to 1-Meg Modem Service Network Implementation Manual,
297-8063-200, for more information on xEMS.
• The transport network provides the connection to the service providers.
Refer to 1-Meg Modem Service Network Implementation Manual,
297-8063-200, for more information on transport networks.
The following figure illustrates a network with the 1-Meg Modem Service.
DMS-100 Family NA100 Star Remote System XPM15 and up
Star Remote System hardware 2-35