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8-6
Ringing 0 0
Ground-start
signaling (FXO-
FXS)
LCF LO (on hook)0101
LCFOLC (off hook)1111
Ringing RG (service
request)
000 0
Ground-start
signaling with
RLCF (FXO-FXS)
LCF LO (on hook)0101
RLCF LC (off hook) 0 1/0 1 1
LCFO RG (service
request)
1100
Ringing 0 0
Loop-reverse-
battery signaling
(DID) (DPO-DPT)
LO LCF 0000
LC RLCF1111
Network-provided
reverse battery
(enhanced 911
apps) (DPT-DPO)
LCF (on
hook)
LO (on hook)0000
RLCF (off
hook)
LC (off hook)1111
E&M signalingon hookon hook0000
off hookoff hook1111
Subscriber-
provided loop-start
supervision (FXS-
FXO)
LO LCF 0101
LC Ringing1100
D4 (SF) Framing Format