PC2095 contains multiple functional elements which can be coupled
together to provide specific functionality at both the encoder and
inputs and outputs are isolated as is the analog and digital
circuitry. This provides the device with very high noise immunity
when operating in high RF environment.
the input side there is two TCP devices which are configured to take
messages from a server and inter-server handshaking.
There is also two analog inputs to allow the device to receive modem
data from two sources.
outputs are digital and analog. The POCSAG code and transmitter
control are delivered by an 8 bit DAC which provides very precise
BELL 202 modem data as well as the ability to send PURC control
tones. The digital outputs can be open collector or TTL
ZWorld processor module can be configured as an encoder and
transmitter controller. The transmission control is embedded into
the start of every data stream and the ZWorld processor firmware can
be configured to encode or decode the data stream.
ZWorld processor module can also be configured as a transmitter
station control device where it decodes the transmission stream at
the start of all the data streams. This is useful for maintenance
purposes where maintenance teams are monitoring the effective radio
footprint of a single site or a combination of sites.
processor also provides bit error on the data stream and full
decoding of the POCSAG data. This information can be accessed
through the TCP port onboard diagnostics menu.
POCSAG data stream in the station control mode can use either a
direct conversion of the analog data into digital data via the PLL
or it can alternatively use the encoder circuitry to re-clock the
data stream. This occurs where the analog levels are very low
creating unacceptable digital jitter in the PLL.