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Main Distribution Frame
The MDF (see Figure 4) is telco equipment that distributes customer DMT signals from a
Cisco 677i modem to its corresponding internal modem on a line card through suitable
MDF to Cisco 6260 DSLAM cabling. Cisco product offerings include prefabricated Champion cable
assemblies in various lengths for connection of customer lines between a CO facility MDF and the line
card connectors on Cisco 6260 DSLAM backplanes. You make these cable connections at Cisco 6260
backplane receptacles. Refer to the Cisco 6260 Hardware Installation and Troubleshooting Guide for
cabling instructions.
Line Cards
In Figure 4, Cisco ATUC-4DMT-ISDN line cards LC
DMT signals to AMT cells and downstream AMT cells to DMT signals. The Cisco NI-2 interface
processor module controls each line card, which
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A full complement of line cards in a single Cisco 6260 DSLAM can handle network communications
from and to as many as 120 customers.
You can install up to four Cisco 6260 DSLAMs, populated with ATUC-4DMT-ISDN line cards in a
direct connect configuration, in a standard NEBS compliant 7-foot CO facility rack.
Cisco NI-2 Network Interface Processor Module
The Cisco NI-2 network interface processor module (see Figure 4) in the Cisco 6260 DSLAM and the
Cisco IOS software running on the Cisco NI-2 control how ATM cells are processed when transported
between the line cards and the WAN network trunk.
The NI-2 processor module
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The Cisco NI-2 Card Installation and Configuration for the Cisco 6260 document describes the
NI-2 network interface processor module.
Line Card Splitter Deployment
Figure 5 shows the DMT/ISDN data and system interface relationships among devices in a typical
ATUC-4DMT-ISDN line card deployment using DMT/ISDN splitters.
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Connects up to four line pairs that transport DMT signals between the line card modems and the
NI-2 module through the MDF
Converts DMT signals, routed from the customer modems, to WAN trunk ATM cells
Converts WAN trunk ATM cells, routed from the NI-2 module, to modem DMT signals
Collects ATM cells from the WAN network trunk intended for customers connected to the line card
modems through the Cisco 6260 DSLAM and the telco MDF
Distributes WAN network trunk ATM cells through the Cisco 6260 DSLAM line cards as
DMT signals among addressed customers connected to the line card modems
and LC
through LC
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Cisco ATUC-4DMT-ISDN Line Card Installation and Configuration
Line Card Splitter Deployment
convert upstream
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