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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.