If using Kentrox CSU part #30–27–00001

order:
Facility Interface Code – 04DU9–B for a 1.544 Mbps D4 framing format circuit

D4-AMI

Service Code – 6.0 N

FCC Registration:
The T1 port card is designed to be used with an external CSU. This CSU provides all re-quired part 68 functions for safety and keep alive. Use the FCC registration number of the particular CSU you are using. The FCC number for the KENTROX CSU is
F8I4HV–17152–DE–N.

Good Luck!!

If all else fails, use a BFH.