pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 86

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

RES
SSP
TIM
U-Interface Events
U0
U2
U4H
AWR
AWT
LOF
TxE
Timers
The start of timers is indicated by TxS, the expiry by TxE. The following table shows
which timers are used.
•
Table 20
Timer
T05
T6
Data Sheet
Reset
Unconditional command which resets the U-transceiver.
Send Single Pulses
Unconditional command which requests the transmission of single pulses on
the U-interface.
Timing
The U-transceiver is requested to enter state ’IOM Awaked’.
U0 detected
U0 is recognized after 120 symbols (1ms) with zero level in a row. Detection
may last up to 2 ms.
U2 detected
The U-transceiver detects U2 if continuous binary 0‘s are found after
descrambling and LOF = 0 for at least 8 subsequent U-frames. U2 is detected
after 8 to 9 ms.
U4H detected
U4H is recognized, if the U-transceiver detects 16 subsequent binary 1’s after
descrambling.
Awake signal (U2W) detected
Awake signal (U1W) has been sent out
Loss of Framing on U-interface
Timer ended, the started timer has expired
Duration (ms)
0.5
6
Timers
Function
C/I code recognition
Supervises U1W repetition
72
Functional Description
State
Start Awaking Uk0
Pend. Deactivation,
Deactivating
PEF 81902
2001-11-12