Juniper CTP2000 Series, Hardware Manual

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Table 4: Ground-Start Signaling at FXO Interface for Call Initiated by the FXO Interface (continued)
Signaling Bits from FXO Signaling Bits to FXO
01 11 FXO goes off-hook (closes loop)
01 11 Duration of call
Table 5: Ground-Start Signaling at FXO Interface for Call Initiated by the FXS Interface
Signaling Bits from FXO Signaling Bits to FXO
11 (A=1, B=1) 01 (A=0, B=1) Idle (before call starts)
00/01 (B-bit toggles) 01 FXS goes off-hook (grounds tip and
sends AC ring signal)
01 11 FXO goes off-hook (closes loop)
01 11 Duration of call
Table 6: Ground-Start Signaling at FXS Interface for Call Initiated by the FXS Interface
Signaling Bits from FXS Signaling Bits to FXS
01 (A=0, B=1) 11 (A=1, B=1) Idle (before call starts)
01 00/01 (B-bit toggles) FXS goes off-hook (grounds tip and
sends AC ring signal)
11 01 FXO goes off-hook (closes loop)
11 01 Duration of call
Table 7: Ground-Start Signaling at FXS Interface for Call Initiated by the FXO Interface
Signaling Bits from FXS Signaling Bits to FXS
01 (A=0, B=1) 11 (A=1, B=1) Idle (before call starts)
00 11 FXO grounds ring
00 01 FXS goes off-hook (grounds tip and
sends AC ring signal)
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