PEB20571 INFINEON [Infineon Technologies AG], PEB20571 Datasheet - Page 68

• Manufacturer Part Number: PEB20571
• Description: ICs for Communications
• Manufacturer: INFINEON [Infineon Technologies AG]

Pending Activation
This state results from a request for activation of the line, either from the terminal
(INFO 1w) or from the layer-2 device (AR, AR2). INFO 2 is then transmitted and the DSP
waits for the responding INFO 1 from the remote device.
Synchronized
This state is reached after synchronization upon the receipt of INFO 1, i.e. after a
maximum of 10 ms. In this state, INFO 2 is supplied to the remote terminal for
synchronization.
Activated
Info 1 has a code violation in the framing bit (F-bit), whereas INFO 3 has none. Upon the
reception of two frames without a code violation in the F bit, the activated state is entered
and INFO 4 is transmitted. The line is now activated; INFO 4 is sent to the remote and
INFO 3 is received from the remote.
Re synchronization
If the recognition of INFO 3 fails, the receiver will attempt to resynchronize. Upon
entering this state, INFO 2 is transmitted. This is similar to the original synchronization
procedure in the pending activation state (the indication given to layer 2 is different).
However, as before, recognition of INFO 1 leads to the synchronized state.
Table 3-4
Command
Deactivate request
Reset
Test mode 1
Test mode 2
Activate request
Activate request test
loop 2
Preliminary Data Sheet
U
PN
State Machine Codes
Abbr.
DR
RES
TM1
TM2
AR
AR2
1000
1010
Code
0000
0001
0010
0011
3-12
Remark
Initiates a complete deactivation from the
exchange side by transmitting INFO 0 (x)
(x)
Transmission of pseudo-ternary pulses at
2 kHz frequency (x)
Transmission of pseudo-ternary pulses at
192 kHz frequency (x)
Used to start an exchange initiated
activation
Transmission of INFO 2, switching of loop
2 (at TE), T bit set to one
Interface Description
DELIC
2003-08