PEF82912FV1.4 Infineon Technologies, PEF82912FV1.4 Datasheet - Page 140

• Manufacturer Part Number: PEF82912FV1.4
• Description: ISDN Interface ISDN
• Manufacturer: Infineon Technologies

Specifications of PEF82912FV1.4

• Mounting Style: SMD/SMT
• Package / Case: MQFP-64
• Lead Free Status / Rohs Status: Details

In order to open an analog loopback correctly, force the U-transceiver into the RESET
state. This ensures that the echo coefficients and equalizer coefficients will converge
correctly when activating anew.
3.2.2
The Q-SMINT I provides test and diagnostic functions for the S/T interface:
The internal local loop (internal Loop A) is activated by a C/I command ARL or by
setting the bit LP_A (Loop Analog) in the S_CMD register if the layer-1 statemachine is
disabled.
The transmit data of the transmitter is looped back internally to the receiver. The data of
the IOM -2 input B- and D-channels are looped back to the output B- and D-channels.
The S/T interface level detector is enabled, i.e. if a level is detected this will be reported
by the Resynchronization Indication (RSY) but the loop function is not affected.
Depending on the DIS_TX bit in the S_CONF2 register the internal local loop can be
transparent or non transparent to the S/T line.
The external local loop (external Loop A) is activated in the same way as the internal
local loop described above. Additionally the EXLP bit in the S_CONF0 register has to be
programmed and the loop has to be closed externally as described in
The S/T interface level detector is disabled.
•
Figure 64
Data Sheet
Analog Loop-Back S-Transceiver
SCOUT-S(X)
External Loop at the S/T-Interface
SR1
SR2
SX1
SX2
126
Operational Description
100
100
PEF 82912/82913
Figure
2001-03-30
64.