User's Manual

Page 29

E Series Data Radio – User Manual

Part E – Getting Started- ER450

Received Signal Indicator

The “RX/SYNC” LED is used to indicate the state of the receiver.

If the LED is off, no signal is being received.

A RED indication shows that an RF carrier is being received, but

no data stream can be decoded. This will brieﬂy happen at the

very start of every valid received transmission or may indicate the

presence of interference, or another user on the channel.

A continuous GREEN indication shows that the modem is locked

and synchronised to the incoming signal, and has excellent Bit

Error Rate (BER). Any losses of synchronisation (BER errors) are

shown as a visible RED ﬂicker of the LED.

Note: This might only be apparent on a PTMP slave when only

receiving.

Verifying Operational Health

It is possible to verify the operation of the radio modem using the

indicators provided by the unit. The state of the transmitter and

receiver, and data ﬂow can be interpreted by the indicator LEDs

(see below).

Note: Port A and Port B’s RxD and TxD will be Active on Data Flow

Data Flow “breakout” LEDs

There are also two LEDs to indicate data ﬂow into and out of the

two user ports.

Input data to be transmitted is shown as a RED ﬂash, and received

data to be output to the port is shown as a GREEN ﬂash.

If data is alternately ﬂowing in and out quickly, then the indicator

appears orange.

Full Duplex – PTMP Master Tx

Half Duplex – Master or Slave (Tx)

Half Duplex – PTMP Slave Rx

Half Duplex – Master or Slave (Rx)

Full Duplex – PTP Master or Slave

LED Legend