Modem Settings; Dhcp Server/Relay - Vocality V200 User Manual

Vocality User Manual
User Manual for V200
Valid for V08_08.02 or V08_48.02
Clock 1 bus (GC1) takes the Port 1 Aggregate Rx clock and Port 2 (also in slot 5), which
will be used to connect a router, uses the GC1 as its reference for generating the Rx
router clock. To go one stage further and operate Port 2 dynamically, the Rx clock
source is set to 'DBA'. This allows the V200 to smoothly vary the Rx clock on Port 2
according to traffic demand.

5.18.1 Modem Settings:

In this example, two Paradise Datacom P300 modems were used. Modem 0 is used to
generate the network clock, since it has a stable +/- 1ppm reference. On the 'Change,
Tx, Baseband' menu you need to select 'Continuous Data' then enter the baseband data
rate, in this case '128000'. On the 'Change, Tx, Clocking' menu you need to set the Tx
clock to 'TX CLOCK IN' which expects the transmit clock on the TT clock pair. On the
'Change, Rx, Buffer/Clocking' menu you need to set the Rx clock to 'INTERNAL'. This will
enable the 'Change, Rx, Buffer/Clocking, Buffer Size' menu, which allows you to select a
buffer to accommodate the incoming Doppler shift. Normally, 4ms per satellite
transition is sufficient, that is a total of 8ms.
Modem 1 recovers the clock from the satellite. On the 'Change, Rx, Buffer/Clocking'
menu you need to set the Rx clock to 'SATELLITE' which will disable the Doppler buffer
and output the Rx clock on the 'RT' clock pair. On the 'Change, Tx, Clocking' menu you
need to set the Tx clock to 'TX CLOCK IN' so as to accept the TT clock back in from the
V200.
5.19

DHCP server/relay

There are three modes of operation for DHCP (Dynamic Host Configuration Protocol).
The mode, and other DHCP parameters, are configurable on the ‡IP > DHCP Server
menu.
The default mode is OFF. In this mode the unit does not take part in DHCP operation –
it is assumed that all stations on the local network have a static IP configuration, or that
a separate DHCP server is available on the local network, or an externally routed
network.
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