PEB 2091
PEF 2091
Operational Description
Pin-PFOFF Power Feed OFF
Corresponds to pin PS1 being activated. This pin indicates that the
remote-power-feed circuit for the subscriber line has been turned off. The
IEC-Q is requested to forward this indication making use of the C/I-channel
code HI.
The chip is transferred to the "Test" state; the Receiver will be reset.
Note 41: If one of the pin configurations Pin-Reset, Pin-SSP or Pin-DT is being
used, C/I command (especially RES, SSP or DT) will not be executed, i.e.
pin setting has higher priority than C/I Channel setting.
Microprocessor
µP-SSP
µP-Send Single Pulses
Applies only in microprocessor mode. Corresponds to the setting:
STCR:TM1 = ’1’ and STCR:TM2 = ’1’. The function of this pin is the same as
of the C/I-code SSP. C/I-message DR will be issued. See "Test Modes",
page 52.
µP-DT
µP-Data Through
Applies only in microprocessor mode. This function is activated by setting:
STCR:TM1 = ’0’ and STCR:TM2 = ’1’. The function of this pin is the same as
of the C/I-code DT. See "Test Modes", page 52.
U-Interface Events
ACT = 0/1 "ACT" bit received from the NT side.
– ACT = 1 signals that the NT has detected INFO3 on the S/T-interface and
indicates that the complete basic access system is synchronized in both
directions of transmission. The LT side is requested to provide
transparency of transmission in both directions and to respond with
setting the ACT-bit to "1". In the case of loop-backs (loop-back 2 or
single-channel loop-back in the NT), however, transparency is required
even when the NT is not sending ACT = 1. Transparency is achieved in
the following manner:
– The IEC-Q performs transparency in both directions of transmission after
the Receiver has achieved synchronization (state EQ-training is left)
independent of the status of the received ACT-bit.
– The status "ready for sending" is reached when the state transparent is
entered i.e. when the C/I-channel indication AI is issued. This is valid in
the case of a normal activation procedure for call control. In the case of
loop-backs (loop-back 2 or single-channel loop-back in the NT and
analog loop-back in the LT) however, the status "ready for sending" is
reached when the state line active is entered i.e. when the C/I-channel
Semiconductor Group
151
Data Sheet 01.99
INFINEON [ Infineon ]
