PEB 2091
PEF 2091
Operational Description
µP-SSP
µP-DT
µP-Send Single Pulses
Applies only in microprocessor mode. Corresponds to the setting:
STCR:TM1 = ’1’ and STCR:TM2 = ’1’. The function of this setting 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 setting is the
same as of the C/I-code DT. See "Test Modes", page 52.
U-Interface Events
The signals SLx and TL received on the U-interface are defined in Table 28, page 125.
ACT
ACT-bit received from LT side.
– ACT = 1 requests the IEC-Q to transmit transparently in both directions.
As transparency in receive direction (U-interface to IOM®-2) is already
performed when the Receiver is synchronized, the receipt of ACT = 1
establishes transparency in transmit direction (IOM®-2 to U-interface),
too. In the case of loop-backs, however, transparency in both directions
of transmission is established when the Receiver is synchronized.
– ACT = 0 indicates that the LT side has lost transparency.
DEA-bit received from the LT side
DEA
UOA
– DEA = 0 informs the IEC-Q that a deactivation procedure has been
started by the LT side.
– DEA = 1 reflects the case when DEA = 0 was detected by faults due to
e.g. transmission errors and allows the IEC-Q to recover from this
situation (see state ’Pend. Deact. U’).
UOA-bit received from network side
– UOA = 0 informs the IEC-Q that only the U-interface is to be activated.
The S/T-interface must remain deactivated.
– UOA = 1 enables the S/T-interface to activate.
Loss of Framing on the U-interface
LOF
This condition is fulfilled if framing is lost for 576 ms. 576 ms are the upper
limit. If the correlation between synchronization word and the input signal is
not optimal, LOF may be issued earlier.
LSEC
Loss of Signal level behind the Echo Canceler
Internal signal which indicates that the echo canceler has converged.
Semiconductor Group
165
Data Sheet 01.99
INFINEON [ Infineon ]
