Ericsson LBI-39224 manual Help

LBI-39224

Help

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Analog or Digital Voice

In addition to T1 or E1 selection, T1/E1 Interface Card configuration includes selecting one of three primary board operating modes:

–Analog/modem mode ("Analog or Digital Voice using Modems")

In the analog/modem mode, the T1/E1 Interface Card transfers PCM-encoded signals between the CEC/IMC TDM network and the T1/E1 line. PCM-encoded signals transferred by this mode include analog (clear) voice, modem-encoded digital voice, and/or modem-encoded data signals. In this mode each site channel is assigned to a T1/E1 channel. In addition, this mode allows use of the T1/E1 Interface Card subrate ports if T1/E1 channels are available after site channel assignments.

Two CEC/IMC TDM bus slots coincide to one full duplex T1/E1 Channel. This is exactly analogous to a CEC/IMC Audio Board channel where two TDM bus slots coincide to one full duplex 4-wire 600-ohm audio channel provided by the Audio Board. The T1/E1 Interface Card extracts a signal from one bus slot and sends it out on a T1/E1 channel. Accordingly, signals received on this same T1/E1 channel are applied to a different CEC/IMC TDM bus slot.

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