PEB 2091
PEF 2091
Operational Description
4.3
Layer 1 Activation and Deactivation
The IEC-Q is designed to meet the newest standards of ANSI and ETSI regarding status
control. The following sections describe some of the most important protocols
implemented in the IEC-Q. They illustrate the interaction between the stations involved.
All information presented in this section is extracted from the state machines (see "State
Machines", page 145).
Table 28 shows all U-interface signals as defined by ANSI.
Table 28
Signal
U-Interface Signals
Synch. Word
(SW)
Superframe
(ISW)
2B + D
M-Bits
NT –> LT
± 3
TN1)
SN0
SN1
SN2
SN3
SN3T
± 3
± 3
± 3
no signal
1
no signal
present
present
present
present
no signal
absent
no signal
1
absent
1
1
1
present
present
LT –> NT
± 3
normal
normal
normal
TL1)
SL0
± 3
± 3
± 3
no signal
1
no signal
present
present
present
present
no signal
absent
no signal
SL1
1
SL2
SL32)
present
present
present
Test Mode
0
0
normal
normal
normal
SL3T
normal
SP3)
± 3
1) Alternating ± 3 symbols at 10 kHz
2) Must be generated by the exchange
3) Alternating ± 3 single pulses of 12.5 µs duration spaced by 1.5 ms, else no signal
Semiconductor Group
125
Data Sheet 01.99
INFINEON [ Infineon ]
