pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 105

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

PEF 81902
Functional Description
G1 deactivated
The S-transceiver is not transmitting. There is no signal detected on the S/T-interface,
and no activation command is received in the C/I channel. Activation is possible from the
â
S/T interface and from the IOM
-2 interface.
G2 pending activation
As a result of an INFO 0 detected on the S/T line or an ARD command, the S-transceiver
begins transmitting INFO 2 and waits for reception of INFO 3. The timer to supervise
reception of INFO 3 is to be implemented in software. In case of an ARL command, loop
2 is closed.
G3 activated
Normal state where INFO 4 is transmitted to the S/T-interface. The transceiver remains
in this state as long as neither a deactivation nor a test mode is requested, nor the
receiver looses synchronism.
When receiver synchronism is lost, INFO 2 is sent automatically. After reception of
INFO 3, the transmitter keeps on sending INFO 4.
G2 lost framing
This state is reached when the S-transceiver has lost synchronism in the state G3
activated.
G4 pending deactivation
This state is triggered by a deactivation request DR. It is an unstable state: indication DI
(state “G4 wait for DR.”) is issued by the S-transceiver when:
either INFO0 is received for a duration of 16 ms,
or an internal timer of 32 ms expires.
G4 wait for DR
Final state after a deactivation request. The transceiver remains in this state until DC is
issued.
Unconditional States
Test mode - TM1
Single alternating pulses are sent on the S/T-interface.
Data Sheet
91
2001-11-12