Integrator's Manual

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The alternateIp field will configure the QAM24 to have a second IP address. This IP address can
be a multicast IP address. However, the QAM24 does not notify a managed switch that it wants
this multicast IP address via IGMP.
Some QAM24 boards have an RF spur that can interfere with analog television channels. The
spur is 1176 MHz minus the desired center RF frequency for each group of four channels. For
channels 23 through 94 this means that the spur will be at (1086 – 6 * channel) MHz. Change
the frequency plan to minimize the impact of the RF spurs.
New reduced cost QAM-6 boards will only permit six QAM carriers to be active at a time. To
increase the number of QAM carriers, additional licenses must be purchased from Technicolor
and downloaded to the QAM24.
When debugging QAM24 issues, click on the qamLog button to see the QAM24 system log.
This log is mainly for Technicolor technical analysis but a short summary is:
A = Arp reply
bad(#) = Discarded # number of unexpected Ethernet packets.
C = Command and control message received
c## = Continuity counter error. May indicate multiple channels to same port.
PMT## = PMT changed on a channel
T = PCR discontinuity