EXFO FTB-800 Series for FTB-1 - Manual (Page 61)

Test Setup - Test Applications
NetBlazer 51
ISDN PRI
ISDN PRI
Allows to test and troubleshoot North American or European ISDN PRI
configurations by calling one or all 23 DS1 or 30 E1 PRI channels. Once
connected, the user can perform a channel-by-channel BERT, or talk and
listen via a headset.

Typical ISDN PRI test applications:
Network
under test
Testing Unit DUT Loopback
FTB-700G/800 Series
Network
under test
Testing Unit Testing Unit
FTB-700G/800 Series FTB-700G/800 Series