Subscriber Initiated Outgoing Call; Subscriber Receives Incoming Call; Busy Condition; Circuit Interactions When A Subscriber Initiates An Outgoing Call (Loop Start) - ADC PG-Flex FLC-704 Manual

SCP-FRC754-042-03H

Subscriber Initiated Outgoing Call

The following occurs when the calling line goes off-hook (see
• loop current flows and is detected by the FLC-704 CU
• FLC-704 receives an off-hook signal from the RT
• FLC-704 generates an off-hook condition to the CO switch
• CO sends dial tone
• FRC-754 passes a dial pulse or Dual Tone Multi Frequency (DTMF) signal through the FLC-704 from the
subscriber and forwards these to the CO.
Table 3.

Circuit Interactions When a Subscriber Initiates an Outgoing Call (Loop Start)

Operation
CO Idle
Subscriber goes
off-hook
CO returns dialtone
Subscriber Dials

Subscriber Receives Incoming Call

The following occurs for an incoming call (see
• FLC-704 detects a ringing signal from the CO
• FLC-704 signals the FRC-754 which then connects ringing to the subscriber
•
subscriber line goes off-hook and the FRC-754, through the FLC-704, provides an off-hook condition to the
CO switch
Table 4.

Circuit Interactions When a Subscriber Receives an Incoming Call (Loop Start)

Operation
Subscriber Idle
CO generates
ringing
Subscriber goes
off-hook
Ring trip

Busy Condition

Loop start busy condition at the RT is a Ring lead negative and a Tip lead positive with loop current flowing. The
same conditions occurs at the CO (see
FLC-704 List 4B
CO Switch FLC-704 COCU
⇒
No ringing
⇐
Off-hook
⇒
Dialtone
⇐
DP or DTMF
Table 4 for circuit interactions):
CO Switch FLC-704 COCU
⇐
On-hook
⇒
Ringing
⇐
Off-hook
⇒
No ringing
Table 5 for circuit interactions).
January 6, 2003
Table 3 on page 5 for circuit interactions):
FRC-754
Subscriber
RTCU
⇒
No ringing
⇐
Off-hook
⇒
Dialtone
⇐
DP or DTMF
FRC-754
Subscriber
RTCU
⇐
On-hook
⇒
Ringing
⇐
Off-hook
⇒
No ringing
Circuit Operation
5