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Carrier Access 5395 Pearl Parkway User Manual

Page 61

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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