pef80913 Infineon Technologies Corporation, pef80913 Datasheet - Page 114

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

A test mode is valid for 75 seconds. If during the 75 seconds a valid pulse sequence is
detected the 75 s timer starts again. After expiry of the 75 s timer the MLT maintenance
controller goes back to normal operation.
•
Table 29
Number of
counted pulses
<= 5
6
7
8
9
10
>= 11
Figure 49
•
Figure 49
Data Sheet
MTI
MTI
Pin
Pin
1
0
1
0
shows examples for pulse streams with inverse polarity selecting Quiet Mode.
ANSI Maintenance Controller States
Pulse Streams Selecting Quiet Mode
500 ms
500 ms
ANSI maintenance
controller state
ignored
Quiet Mode
ignored
Insertion Loss Measurement transition to state ’Transparent’
ignored
normal operation
ignored
20 ms < t
20 ms < t
1
1
LOW
HIGH
2
2
< 500 ms
< 500 ms
100
3
3
4
4
4 ms < t
4 ms < t
U-transceiver State Machine
no impact
transition to state ’Reset’
start timer 75s
no impact
start timer 75s
no impact
transition to state ’Reset’
no impact
5
5
LOW
HIGH
6
6
< 500 ms
< 500 ms
Functional Description
PEF 82912/82913
500 ms
500 ms
mlt.vsd
2001-03-30