PEB 2091
PEF 2091
Operational Description
Timers
The start of timers is indicated by TxS, the expiry by TxE. The Table 30 shows which
timers are used by the IEC-Q in NT mode:
Table 30
Timer
T1
Timers for NT State Machine
Duration (ms) Function
State
15000
40
Supervisor for start-up
T7
Hold time
Receive reset
Alerting
T11
9
TN-transmission
T12
5500
15000
Supervisor EC-converge
Frame synchronization
EC-training
T13
Pend. receive
reset
T14
0.5
Hold time
Pend. timing
4.4.3.3 Output Signals and Indications in NT Modes
Signals and indications are issued on the C/I Channel and on the U-interface (predefined
U-signals).
C/I Indications
AI
Activation Indication
The IEC-Q has established transparency of transmission in the direction
IOM®-2 to U-interface. In an NT1, the S-transceiver is requested to send
INFO4 and to achieve transparency of transmission in the direction IOM®-2
to S/T-interface.
AIL
AR
Activation Indication Loop-back
The IEC-Q has detected ACT = 1 while loop-back 2 is still established. In an
NT1, the S-transceiver is requested to send INFO4 (if a transparent
loop-back 2 is to be implemented) and to keep loop-back 2 active.
Activation Request
The IEC-Q has synchronized on the incoming signal. In an NT1, the
S-transceiver is requested to start the activation procedure on the
S/T-interface by sending INFO2.
ARL
Activation Request Loop-back
The IEC-Q has detected a loop-back 2 command in the EOC-channel and
has established transparency of transmission in the direction IOM®-2 to
U-interface. In an NT1, the S-transceiver is requested to send INFO2 (if a
transparent loop-back 2 is to be implemented) and to operate loop-back 2.
Semiconductor Group
167
Data Sheet 01.99
INFINEON [ Infineon ]
