Each of the 3 tfo-*.hex files in this directory is an extract from an MSC-side E1 timeslot recording in a Nokia TCSM2 TFO session involving a cross-connect between two TRAU channels. The extracts have been chosen to begin at the point where the TRAU starts emitting TFO frames, thereby beginning with a series of TFO frames that contain an embedded TFO_TRANS message. In each experiment, one of the two cross-connected TRAU channels emitted two "plain" TFO frames (not containing embedded TFO messages) in between the initial embedded TFO_TRANS and the subsequent embedded TFO_REQ_L; this channel was chosen for the present extracts. Each extract is thus 2560 PCM samples, containing 16 aligned TFO frames: 5 carrying TFO_TRANS, 2 plain, 9 carrying TFO_REQ_L. In each of the three TCSM2 sessions from which these TFO frame extracts were taken, the Ater UL input was fed with a stream of good DHFs (decoder homing frames) for the respective codec, hence the TFO frame content is nothing but these DHFs. In the case of FR and EFR captures, one of the 16 consecutive frames also exhibits TAF=1. OTOH, the same does not hold for HR: the TRAU-8k frame format used in TFO and in most Abis implementations carries TAF only for BFIs and invalid SID, but not for good speech or valid SID frames.