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Cisco ATUC-4DMT-ISDN Line Card Installation and Configuration
78-10981-01
Line Card Splitter Deployment
CPE Hardware Group
The CPE hardware group (see Figure 5) consists of customer and telco equipment that transmits and
receives both ISDN and DMT signals and PC equipment that transmits and receives Ethernet data. A
typical CPE hardware group (for example, CPE
1
) consists of
•
ISDN terminal equipment
•
A network NT1 device
•
A Cisco 677i modem
•
A DMT/ISDN splitter
The following sections describe the components that make up a typical splitter-configured
CPE hardware group.
ISDN Terminal Equipment
ISDN terminal equipment
•
Provides ISDN services such as telephony and data terminal applications
•
Provides upstream and downstream ISDN signaling functions
NT1 Device
The NT1 device (see Figure 5) includes two ports that typically provide an interface to the
customer ISDN terminal equipment and the CPE DMT/ISDN splitter. The NTI device passes properly
formatted 2B1Q or 4B3T signals (see Table 3) to the splitter.
Cisco 677i Modem
In this deployment, the Cisco 677i modem (seeFigure 5 ) also provides the Ethernet primary interface.
The Cisco 677i modem transmits and receives DMT signals or Ethernet data passed between the local
DMT/ISDN CPE splitter and the customer LAN. Specifically, the Cisco 677i modem provides the
required ATUC-R function, which
•
Converts line card downstream DMT signaling to its Ethernet data equivalent for transfer to the
customer Ethernet LAN
•
Converts upstream Ethernet data to an equivalent DMT signal for transfer to the line cards through
the CPE DMT/ISDN splitter
The DMT port interfaces physically with the CPE DMT/ISDN splitter. The modem ports must be used
to transport data traffic over an ADSL access network.
CPE DMT/ISDN Splitter
The CPE DMT/ISDN splitter (Figure 5) electrically couples the ISDN signal from the NT1 device and
the DMT signal from the modem onto the pair carrying the DMT/IDSN traffic between the CPE facility
and the MDF at the CO facility. The CPE splitter provides a filtering function that
•
Separates ISDN and DMT signals from the composite downstream signal
•
Feeds the downstream ISDN signal to the local NT1 device
