AT&T MERLIN LEGEND Installation & Maintenance Manual page 186

Installation
WARNING:
National and local building codes specify the type of cable
required for telecommunication wiring. For example, indoor
wiring (DIW) cable cannot be used inside or on top of air
plenums or ducts, along hot pipes, or across walkways.
Consult your local ordinances and regulations for proper
cable selection.
If staples are used to attach the cords to walls or baseboards,
check that the cords have not been pierced. Also, do not run CO
lines from the network interface to the CU if the distance is
greater than 25 feet.
Connect the Network Interface to
the CU
The local telephone company installs the network interface for
the CO lines. Before you install the system, verify that the
network interface is the proper type and that it is located within
25 feet of the CU. The adapter needed to connect the CO lines
to the CU depends on the type of network interface, as shown in
Table 3-32 below.
CAUTION:
To avoid coupling power supply noise onto system wiring,
allow at least 3 inches of clearance between the basic
carrier's power supply and any wiring or termination
hardware located left of the CU.
3-78 System Wiring