Comtech EF Data SLM-5650A Vipersat - Manual (Page 76)

Vipersat Configuration
3-36 Vipersat SLM-5650A User Guide
Speed-Up Eb/No
The Speed-Up E
b
/N
0
range parameter provides a means of decreasing the
power adjustment period when an excessive delta occurs between the E
b
/N
0
receive level and the target value. This ensures that an optimal receive level is
maintained.
Normally, the DPC message is sent every 30 seconds from each terminal in the
network. Should the received E
b
/N
0
level at the demodulator ever fall outside
the specified range, the terminal increases its message send rate to every 10
seconds until the receive level is again within the range set value. This provides
a speed-up loop to rapidly regain link quality.
To modify this parameter, enter a value from 0.0–15.0 dB, then click the
Submit button. The default value is 5.0 dB.
Target IP Address
The Target IP Address identifies the modem that is transmitting to this
SLM-5650A, and will be receiving the DPC messages that provide the current
E
b
/N
0
value for this unit. Typically, all Remotes will specify the Hub modem
that is supplying the TDM outbound. The Outbound IP address is sent out to all
STDMA Remotes via the Burst Map, and the DPC Target for these Remotes is
automatically mapped to that address.
Manually entering the Target IP Address is only necessary for modems that are
SNMP managed Out-of-Band and will be utilizing the DPC feature. For In-
Band modems, the target addresses are handled automatically by the VMS.
To manually configure the target address for an Out-of-Band modem, enter an
IP Address, then click the Submit button.
The STDMA Burst Controller is not permitted to specify a DPC Target because
the demodulator is receiving multiple bursts very rapidly from all Remotes in
the group and is unable to utilize DPC to control the transmit power of the
Remote modems. However, the transmit power of the Burst Controller adjusts
to meet the target E
b
/N
0
values for the Remotes in the group.
Maximum Power
The commissioning of a satellite terminal must comply with the calculated link
budget that is conducted before terminal installation. Using these calculations,
the maximum transmit power level permitted for the modulator(s) based on
link/satellite parameters can be configured. This is the value set by the Maxi-
mum Power parameter.
This parameter field is read only, and reflects the result of the Max Power
calculation that is performed by the operator when the Calculate New Max