CDA EVM9 Manuale Utente Scaricare il pdf (Pagina 29)

How does Agilent BLER operate, why does this affect 8PSK

measurements?

• 3. To generate a measurable uplink, the mobile station is polled

every block (every block is default - poll rate is user settable) on

the demodulating timeslot. This causes the mobile station to

transmit on the downlink TBF PACCH logical channel a "Packet

Downlink Acknowledged/Not Acknowledged" message that

contains the BLER information.

• BLER connection type was very helpful for GPRS mobiles which

did not support ETSI A or B test modes. It can still be used for

EGPRS, BUT the ACK/NACK’s are always transmitted in GMSK.

• BLER can therefore be used for 8PSK demod, BLER tests and

GMSK transmitter measurements, but NOT 8PSK Tx

Measurements.

Data Connections – Agilent BLER

IV.

EDGE

Manufacturing

Considerations

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CDA EVM9 Manuale Utente Pagina 29