Inter Register Signaling

The concept of address signaling in R2 is slightly different from that used in the other CAS systems previously discussed. In the case of R2, the exchanges are considered registers, and the signaling between these exchanges is called inter-register signaling. Inter-register signaling uses forward and backward in-band MF signals to transfer called and calling party numbers as well as the calling party category.

In this case, signaling is compelled because the registers in the outgoing and incoming exchanges hold the signal until an acknowledgment is received. The signals consist of two voice-band frequencies and are listed in Table 3-10.

Table 3-10. CCITT-R2 and National R2 Inter-Register Signal Frequencies

Signal

Forward Frequency in Hz

Backward Frequency in Hz

Dig

t 1

1380 and 1500

1140 and 1020

Dig

t 2

1380 and 1620

1140 and 900

Dig

t 3

1500 and 1620

1020 and 900

Dig

t 4

1380 and 1740

1140 and 780

Dig

t 5

1500 and 1740

1020 and 780

Dig

t 6

1620 and 1740

900 and 780

Dig

t 7

1380 and 1860

1140 and 660

Dig

t 8

1500 and 1860

1020 and 660

Dig

t 9

1620 and 1860

900 and 660

Dig

t 0

1740 and 1860

780 and 660

Not used

1380 and 1980

1140 and 540

Not used

1500 and 1980

1020 and 540

Not used

1620 and 1980

900 and 540

Not used

1740 and 1980

780 and 540

End of #

1860 and 1980

660 and 540

0 0

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