Comtech EF Data CIM-300L - Manual (Page 150)

CiM-300L IP Enabled Satellite Modem Rev. 1
AUPC CD/CIM300L.IOM
124
LINK
MODEM A MODEM B
M O D E M
Figure 8-1. AUPC Between Two Modems Figure 8-2. Self-Monitoring AUPC with
One Modem
With Local AUPC On, set modems (A and B), if modem A loses carrier:
1 Modem A sets its output power (MAXIMUM, MINIMUM, OR HOLD) as specified by LOCAL
CL ACTION.
2 Modem A then sends a “lost carrier” command to modem B.
3 Modem B sets its output power (MAXIMUM, MINIMUM, OR HOLD) as specified by
REMOTE CL ACTION.
4 Once modem A has reacquired the carrier, it sends commands to modem B to achieve the
desired Eb/No. During this time, modem B sends commands to modem A to increase or
decrease power to maintain modem B’s target Eb/No.
Notes:
1 Modem B will not make changes to modem A if the Eb/No is within 0.5 dB of the
target noise.
2 Modem B will not control modem A transmitting output level if the target noise for
modem B is set within 15.5 to 16.0 dB and the receive signal to the modem is
sufficient that the receive noise is 16 dB or better.
3 Modem A will be transmitting at the maximum output if the local carrier loss action is
set to maximum.
4 Caution shall be observed when setting the target Eb/No above 15.5 dB, the
maximum limit is established at 16.0 dB.
5 Local carrier loss always takes priority over remote carrier loss
6 The RX AUPC link is dead when the carrier is lost.