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ROSS
Boot & Initialization: (burst transmission failure)
1. The default Home State power value is applied to the base modem modulator on boot-up.
2. After transmission grant, remote bursts to corresponding STDMA controller with ACK +
Registration request message.
3. If hub reception was impaired and transmission acquisition failed the burst controller sets
the missed ACK flag to '0' indicating to corresponding remote failed burst acquisition.
4. Power adjustment is required.
5. Remote missed ACK counter is initialized waiting next burst map and flag set value.
6. If count reaches 10 (burst maps) missed ACK's the default power is increased by 3dB.
7. If next burst map indicates received ACK, the missed ACK counter holds count until 5
consecutive receive counts.
8. After 5 consecutive receive counts the missed counter is reset and the power value is
stored in DPC Delta variable.
9. VMS responds to registration request sending registration configuration.
10. Remote may now switch to SCPC mode.
Note all stated power process assumes receive transmission from the hub TDM is good.
4.1
ROSS Client Interface
The ROSS client interface is accessed using either Telnet or Serial connections through an open
source application, Putty. The RS-232 serial connection is always running the ROSS client
application and requires no login account. This serial interface is used for local maintenance
configuration management such as resetting login passwords or unit IP address.
The ROSS client interface is accessed by Putty, an open source Windows application. Putty is a
Win32 Telnet client configurable for either serial or LAN IP communications.
Comtech EF Data, Vipersat Products
MN/13070
Page 27 of 87
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