Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 291)

Chapter 5 - Configuring ROSS Units 5-3
MN/22156, rev 12 Status and Control
• Heading – Identifies the position retrieved from the most recent ACU
poll. This value is expressed in decimal degrees. ROSS polls the ACU for
position on a five second interval.
• Handoff Mode – The ROSS Handoff Mode is defaulted to automatic
mode (satellite handoff is triggered by vessel position within Service
Areas) on startup. If Force Manual Mode is invoked, Automatic Handoff
mode is disabled. Automatic Handoff mode can also be enabled or
disabled. When Automatic Handoff mode is disabled, the modem will
continue to transmit except if it enters a coordinated area with a transmit
flag set to disabled. On power up Automatic Mode is always enabled.
• Stealth Mode – If enabled, ROSS will omit any location information in
the Satellite Location Identification Protocol (SLIP) message. Some
modes of operation require location of vessels to remain unidentified from
network operators. This mode can be enabled or disabled from the
Tracking menu item under ROSS Configuration (Parameter Editor).
• Last Poll – Indicates the last poll time at which the ROSS queried the
modem and ACU for status display updates, approximately every five
seconds.
• ACU Status – Indicates the number of failed or successful poll attempts
from start of ROSS server or from last Reset. A percentage is calculated
from the count differences between failed or succeeded attempts. If failed
attempts are equal 100%, check communications between ROSS and
ACU.
Note that if status is indicating failed the modulator transmission is muted.
• Modem Status – Indicates the number of failed or successful poll
attempts from start of ROSS server or from last Reset. A percentage is
calculated from the count differences between failed or succeeded
attempts. If failed attempts are equal 100%, check communications
between ROSS and modem.
Note if status is indicating failed the modulator transmission is muted.
• System Up Time – Indicates the elapsed operating time of the ROSS
server since last boot time.
• Managing VMS – The active managing VMS sends an address
announcement multicast message on timed intervals containing its source
IP address. This address is used by all listening units that match the
multicast address within the specified network. After reception of the
active managing VMS announcement multicast message, the ROSS
processes the information and sets the VMS destination IP address
wherein to send unsolicited information. This address may change if there
is server alteration either through redundancy switchovers or
administration of new IP address network plan.