EXFO FTB-800 Series for FTB-1 - Manual (Page 403)

Test Functions
NetBlazer 393
FDL - Bit-Oriented Message
Codeword
Command/Response Codeword Pattern
Line Loopback Activate 00001110 11111111
Line Loopback Deactivate 00111000 11111111
Payload Loopback Activate 00010100 11111111
Payload Loopback Deactivate 00110010 11111111
Reserved for Network Use 00010010 11111111
(Loopback Activate)
Universal Loopback (Deactivate) 00100100 11111111
ISDN Line Loopback (NT2) 00101110 11111111
CI/CSU Line Loopback (NT1) 00100000 11111111
For network use 00011100 11111111
(indication of NT1 power off)
Protection Switch Line 1 b 01000010 11111111
Protection Switch Line 2 01000100 11111111
Protection Switch Line 3 01000110 11111111
Protection Switch Line 4 01001000 11111111
Protection Switch Line 5 01001010 11111111
Protection Switch Line 6 01001100 11111111
Protection Switch Line 7 01001110 11111111
Protection Switch Line 8 01010000 11111111
Protection Switch Line 9 01010010 11111111
Protection Switch Line 10 01010100 11111111
Protection Switch Line 11 01010110 11111111
Protection Switch Line 12 01011000 11111111