Nortel Networks R2MFC manual Line signaling, Register signaling

Chapter 5 Configuring the R2MFC MBM 47

Line signaling

Line signaling (for example, seize, answer, and disconnect) are implemented by R2 Channel Associated Signaling known as ABCD bits. Only the two bits AB are used for line signaling. The state (value) of the bits indicate the signal.

The channels are always bidirectional, (that is, they accept incoming calls or originate outgoing calls). The channel behavior also supports one-way trunks. The direction of the signal does not need to be configured. Because the R2MFC MBM is passive, the R2MFC MBM does not initiate calls; it only passes call origination attempts from one side to the other. The R2MFC MBM assumes that the two sides (BCM and CO) respect the direction of the trunk as agreed between them.

The meaning of the bit states are part of the country-specific parameters; however, they can be customized through the CLI by using commands in the R2 directory.

The following are additional options included in country-specific parameters:

•use backward force-release signal to clear back (yes/no)

•release-guard state (timer) when clearing back (timer value)

•optional CD bits value (usually ignored)

Register signaling

Register signaling (digits transmission) is implemented by in-band dual-tone signals known as MFC-R2. Physically, there are 15 forward signals and 15 backward signals. The standard defines two stages of the signaling. The meaning of the signal depends on the stage and the direction of the call. In total, there are four tables of 15 signals each. See Appendix A, “Configuring DIP switch settings and definitions,” on page 91 for MFC country-specific signal tables.

The meaning of MFC signals can be different when transmitted or received. MFC signal tables are part of the country-specific parameters. The meaning of the MFC signals in the R2MFC MBM are configurable through the CLI by using commands in the MFC directory.

The following are other options included in country-specific parameters:

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