Cisco Model D-PCG1000 PowerKEY CAS Gateway Installation Guide
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Chapter 2 Upgrading the Software
28
4022031 Rev B
Rule Description
5
Transport distances are in integer multiples of 31 km to a maximum of
248 km.
248 km.
6
All four demodulators are delayed by the same value programmed in the
QPSK modulator.
QPSK modulator.
7
The distance ranges stated in this document are approximate and based on
a velocity of propagation in fiber of 68 percent of the speed of light in a
vacuum (3 x 108 meters per second). Corrections to the setting of the
QPSKs should be made where these distances do not apply, as in coaxial
cable.
a velocity of propagation in fiber of 68 percent of the speed of light in a
vacuum (3 x 108 meters per second). Corrections to the setting of the
QPSKs should be made where these distances do not apply, as in coaxial
cable.
8
DHCTs closer than the programmed distance value may not range and
may interfere with other DHCTs.
may interfere with other DHCTs.
9
The delay distances that appear on the front panel of the QPSK are one-
way path distances and assume an equal distance path on the forward and
reverse connection. It is not necessary for the forward and reverse path to
be the same distance as long as the total propagation delay matches the
equivalent time delay.
way path distances and assume an equal distance path on the forward and
reverse connection. It is not necessary for the forward and reverse path to
be the same distance as long as the total propagation delay matches the
equivalent time delay.
10
It will not be possible to use a co-located DHCT directly connected to the
QPSK modem as a test device for QPSK link verification when the ranging
extension mode is used. This connection violates rule 8. However, you can
test for QPSK link verification with a DHCT directly connected to the
QPSK as long as the reverse path is not active.
QPSK modem as a test device for QPSK link verification when the ranging
extension mode is used. This connection violates rule 8. However, you can
test for QPSK link verification with a DHCT directly connected to the
QPSK as long as the reverse path is not active.