8-6
Ringing
0
0
Ground-start
signaling (FXO-
FXS)
LCF
LO (on hook)
0
1
0
1
LCFO
LC (off hook)
1
1
1
1
Ringing
RG (service
request)
0
0
0
0
Ground-start
signaling with
RLCF (FXO-FXS)
LCF
LO (on hook)
0
1
0
1
RLCF
LC (off hook)
0
1/0
1
1
LCFO
RG (service
request)
1
1
0
0
Ringing
0
0
Loop-reverse-
battery signaling
(DID) (DPO-DPT)
LO
LCF
0
0
0
0
LC
RLCF
1
1
1
1
Network-provided
reverse battery
(enhanced 911
apps) (DPT-DPO)
LCF (on
hook)
LO (on hook)
0
0
0
0
RLCF (off
hook)
LC (off hook)
1
1
1
1
E&M signaling
on hook
on hook
0
0
0
0
off hook
off hook
1
1
1
1
Subscriber-
provided loop-start
supervision (FXS-
FXO)
LO
LCF
0
1
0
1
LC
Ringing
1
1
0
0
D4 (SF) Framing Format
Summary of Contents for AB II
Page 2: ......
Page 4: ......
Page 8: ...iv ...
Page 34: ...2 8 ...
Page 44: ...5 4 ...
Page 66: ...8 12 ...