Quantum and Evolution Series Installation and Operating Handbook
10-8
For the Synchronous RS232 interface theinput clock/data phase is selected automatically,
reporting a `Data Marginal` warning whenever it has to switch phase. If the modem reports
Data Marginal frequently then this is not a modem fault but an indication that you have a
clocking problem external to the modem (ie changing clock/data phase, a problem which
would otherwise have caused untraceable data errors). With the Tx Clocking Set to
Tx
Clock In
the `Data In` signal is checked against the `Clock In` signal. With the Tx Clocking
Set to
Internal
or
Rx
the `Data In` signal is checked against the `Int= Tx Clk Out` signal. By
selecting
Advanced
it is possible to configure the modem to raise an alarm if either the
`Sig= Valid In` line (CA) or `Device (DTE) Ready In` line (CD) switch to the inactive state. It
is also possible to configure the Tx carrier to be switched on and off by the `Sig= Valid In`
line (CA) by selecting
Change
,
Tx
,
Modulator
,
Carrier
,
RTS-Controlled
.
For Asynchronous RS232 interface the Tx / Rx AIS detectors and the data marginal
detectors are automatically disabled to prevent any unwanted alarms. The internal Tx clock
output is also automatically used to provide a reference clock to the incoming Async data.
For best operation, Paradise recommends using the Async RS232 interface at least 10
times oversampled. For example, an Async baud rate of 56.7kbaud requires a Modem bit
rate of 512kbit.
P3702 in G.703 Mode
If the G.703 option is fitted to the modem, together with either the EIA 530 connector or
BNC connector panel, then G.703 becomes a front panel / software selectable interface.
If G.703 is selected under
Edit/Unit/Interface/Terrestrial
then the following interface
description applies.
When G703 interface is selected, the
Advanced
menu allows the mode to be selected.
The G703 interface panel supports E1, T1, E2, T2, E3 and T3 data rates at the following
line coding, impedance, traffic bit rates and physical interfaces.
