pef80913 Infineon Technologies Corporation, pef80913 Datasheet - Page 108

• Manufacturer Part Number: pef80913
• Description: 2b1q Second Gen. Modular Isdn Nt
• Manufacturer: Infineon Technologies Corporation

PEF 82912/82913
Functional Description
Error S/T
The downstream device is in an error condition (EI1). The LT-side is informed by setting
the ACT-bit to “0” (loss of transparency on the NT-side).
IOM -2-Awaked
The U-transceiver is deactivated, but may not enter the power-down mode.
Pending Deactivation of S/T
The U-transceiver has received the UOA-bit at zero after a complete activation of the S/
T-interface. The U-transceiver requests the downstream device to deactivate by issuing
DR.
Pending Deactivation of U-Interface
The U-transceiver waits for the receive signal level to be turned off (LSU) to start the
deactivation procedure.
Pending Receive Reset
The “Pending Receive Reset” state is entered upon detection of loss of framing on the
U-interface or expiry of timer T1. This failure condition is signalled to the LT-side by
turning off the transmit level (SN0). The U-transceiver then waits for a response (no
signal level LSU) from the LT-side.
Pending Timing
In the NT-mode the pending timing state assures that the C/I-channel code DC is issued
four times before entering the ’Deactivated’ state.
Receive Reset
In state ’Receive Reset’ a reset of the Uk0-receiver is performed, except in case that
state ’Receive Reset’ was entered from state ’Pend. Deact. U’. Timer T7 assures that no
activation procedure is started from the NT-side for a minimum period of time of T7. This
gives the LT a chance to activate the NT.
Reset
In state ’Reset’ a software-reset is performed.
Synchronized 1
State ’Synchronized 1’ is the fully active state of the U-transceiver, while the downstream
device is deactivated.
Data Sheet
94
2001-03-30