psf21911 ETC-unknow, psf21911 Datasheet - Page 74

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

PSB 21911
PSF 21911
U-Transceiver
Wait for ACT
Upon the receipt of AI, the ACT-bit is set to “1” and the NT waits for a response (ACT =
1) from the LT-side. The output of indications and transmit signals is as defined for the
“Synchronized” state.
Wait for SF
Upon detection of SL2, the signal SN2 is sent on the U-interface and the receiver waits
for detection of the superframe indication. Timer T1 is then stopped and the
“Synchronized” state is entered.
Wait for SF AL
This state is entered in the case of an analog loop-back and allows the receiver to update
the AGC, to recover the timing phase, and to update the EQ-coefficients. Signal SN3 is
sent instead of signal SN2 in the “Wait-for-SF” state.
2.5.8
C/I Codes
Both commands and indications depend on the data direction. Table 15 presents all
defined C/I codes. A new command or indication will be recognized as valid after it has
been detected in two successive IOM frames (Double last-look criterion). Indications are
strictly state orientated. Refer to the state diagrams in the previous sections for
commands and indications applicable in various states.
Semiconductor Group
74
11.97