Carrier Access 5395 Pearl Parkway - Manual (Page 61)

Analog Ports
8-7
The interpretation of the signaling bits for ESF framing are as follows:
The following abbreviations are used in this table:
LCF - Loop current feed
RLCF - Reverse loop current feed
LCFO - Loop current feed open
LO - Loop Open
LC - Loop closure
RG - Ring ground
ESF Framing Format
See the legend at the end of this table for explanations of abbreviations.
Signaling Type State Receive (Network-to-
CI) Transmit (CI-to-
Network)
Rx Tx A B C D A B C D
Loop-start signaling
(FXO-FXS) LCF LO (on hook) 0 1 0 1 0 1 0 1
Ringing LC (off hook) 0 0 0 0 1 1 1 1
Loop-start signaling
with RLCF (FXO-
FXS) LCF LO (on hook) 0 1 0 1 0 1 0 1
RLCF LC (off hook) 0 1 0 0 1 1 1 1
LCFO 1 1 1 1
Ringing 0 0 0 0
Ground-start
signaling (FXO-
FXS) LCF LO (on hook) 0 1 0 1 0 1 0 1
LCFO LC (off hook) 1 1 1 1 1 1 1 1
Ringing RG (service
request) 0 0 0 0 0 0 0 0
Ground-start
signaling with
RLCF (FXO-FXS) LCF LO (on hook) 0 1 0 1 0 1 0 1
RLCF LC (off hook) 0 1 0 0 1 1 1 1
LCFO RG (service
request) 1 1 1 1 0 0 0 0
Ringing 0 0 0 0
Loop-reverse-
battery signaling
(DID) (DPO-DPT) LO LCF 0 0 0 0 0 0 0 0
LC RLCF 1 1 1 1 1 1 1 1
Network-provided
reverse battery
(enhanced 911
apps) (DPT-DPO) LCF (on
hook) LO (on hook) 0 0 0 0 0 0 0 0
RLCF (off
hook) LC (off hook) 1 1 1 1 1 1 1 1
E&M signaling on hook on hook 0 0 0 0 0 0 0 0
off hook off hook 1 1 1 1 1 1 1 1
D4 (SF) Framing Format