PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 151

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Pin-PFOFF Power Feed OFF
Note 41: If one of the pin configurations Pin-Reset, Pin-SSP or Pin-DT is being
Microprocessor
µP-SSP
µP-DT
U-Interface Events
ACT = 0/1 "ACT" bit received from the NT side.
Semiconductor Group
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.
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.
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-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.
– ACT = 1 signals that the NT has detected INFO3 on the S/T-interface and
– The IEC-Q performs transparency in both directions of transmission after
– The status "ready for sending" is reached when the state transparent is
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 Receiver has achieved synchronization (state EQ-training is left)
independent of the status of the received ACT-bit.
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
151
Operational Description
Data Sheet 01.99
PEB 2091
PEF 2091