MC145572EVK Datasheet, PDF (45/52 Pages) Motorola, Inc – ISDN U-Interface Transceiver Evaluation Kit

Freescale Semiconductor, Inc.
MC145572EVK after invoking any of the LPU commands. Each U-Interface Transceiver can be
independently put into analog loop-back.
The echo canceller loop-back is an external analog loop-back where data received on the U-Interface
Transceiver IDL Rx pin is framed up and then transmitted as 2B1Q symbols. The 2B1Q symbols are
received by the U-Interface Transceiver and cancelled by the echo canceller. Only the echo cancellers are
enabled during this mode. When the U-Interface Transceiver is operating correctly, BR12+BR13 should
have a low value. Preferably, BR12 should be 00 and BR13 should be a low value. BR13 will continue to
ßuctuate in value slightly. BR11 should read as 10 or 11. Several seconds may elapse before the registers
reach a steady state and the correct bits are set.
MC145572EVK
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