Nortel DMS-100 Series Maintenance Manual page 58

2-38 Star Remote System hardware
1-Meg Modem Service components
The following section describes some of the components in the 1-Meg Modem
Service.
NTEX17DA xDSL line card The NTEX17DA xDSL line card (xLC)
provides full voice service and high speed data communication with a
subscriber's 1-Meg Modem.
The xLC has the following features:
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The xLC terminates the subscriber's line and transmits the call to the DBIC for
multiplexing. The following figure illustrates the xLC in the 1-Meg Modem
Service.
Figure 2-16 xLC in 1-Meg Modem Service
DBIC
297-8353-550 Standard 05.01 March 2001
located in a standard LCM line drawer with 1-Meg Modem Service
capability
provides standard voice service using the world line card (WLC)
provides xDSL modem function over loops up to 18,000 feet on 26
American wire gauge (AWG) wire and 24,000 feet on 24 AWG
rate-adaptable in both downstream (DS) and upstream (US) directions
quadrature amplitude modulation (QAM) modulation in both DS and US
directions
supports both narrowband and wideband DS spectra low and high
transmission levels
raw transport downstream data rates of 1280 kbit/s to 80 kbit/s
raw transport upstream transport data rates of 320 kbit/s to 40 kbit/s
provides an extended LBUS (XLBUS) interface to backplane
-48 V power to data part of card
self-identifying to DBIC on installation
out-of-service data loopback capability for OAM
low power design
occupies a two-slot form factor
XLBUS Twisted pair
xLC
1-Meg Modem