loopback test mode

[Bret Foreman]

The manual for my Agilent N4010A Wireless Test Set talks about a BER test based on a "vendor specific loopback test mode". This mode would allow me to do BER measurements without connecting to the DUT with a cable. Is there Nordic-supplied loopback code that I can build and download or must I write my own? I've looked at the DTM white paper (nan_34) but that seems to assume a UART connection.

Here's the section:

4.1.2 BER test setup
Different measurement setups
can be used to perform a BER
measurement. Similar to the
transmitter measurement setup, a
BER measurement can be performed
using a Bluetooth standalone tester
(see Figure 10), or with a test system.

A BER measurement performed with
the Agilent N4010A Bluetooth test
set is shown in Figure 35. A link
has been established between the
standalone tester and the Bluetooth
DUT. The DUT, operating in vendorspecific
loopback test mode, receives,
demodulates, and decodes the
incoming signal. It then re-packets
the recovered payload data in the
same packet type as it received and
re-transmits the packet. The returned
packet is then received by the
Bluetooth test set, which performs
a BER measurement. The Bluetooth
Test Specification specifies a
minimum of 1,600,000 returned
payload bits to be analyzed in
performing a receiver measurement.

[Bret Foreman]

To explain a little more, the UART-based DTM will be fine for manufacturing test. But my application use-case does not allow a wired connection and I need to correlate the application performance to the manufacturing tests. So I need a wireless loop-back to do that correlation.