Installation Guide

36 QPSK (Release A63) Software Upgrade and Installation Instructions 4002804 Rev C
What Is the QPSK Range Extension Feature?, Continued
Range Distance Settings Diagram
The following diagram illustrates the correct range distance settings.
Example: With 155 km set on the QPSK, the closest distance you could locate a
DHCT to a QPSK modulator is 155 km. The farthest distance you could locate a
DHCT to a QPSK modulator is 217 km.
Network Configuration Application Rules
Follow these application rules when configuring the network for the QPSK ranging-
distance extension mode.
Rule
Description
1
The QPSK modulator operates normally when no delay value is
configured.
2
Only four D9482 QPSK Demodulators can be connected to a QPSK
modulator operating in delay mode. These demodulators must be
connected to ATM-25 port locations 5, 6, 7, and/or 8. (Ports 1 through 4
may not be used in the range extension mode.) The configuration at the
DNCS should reflect this requirement.
3
The programmed delay distance should be less than or equal to the sum
of the transport cable to the hub, plus the shortest optical cable distance
on any of the attached nodes.