Operational Description
3.3.2.3 Layer-1 Command/Indication Codes and State Diagrams in NT Mode
Table 15
Commands and Indications NT
Command (downstream)
Abbr. Code Remarks
DR 0000 (x)
Deactivate request
Resynchronization downstream RSYD 0100 Transmission of pseudo-ternary pulses at
96 kHz frequency after loss of
synchronism of the U interface
Activate request downstream
Activate request loop
ARD 1000 Transmission of info 2
ARL
DID
1010 Transmission of info 2, switching of test
loop 2
Deactivate indication
downstream
1111 Deactivation acknowledgement,
quiescent state
Activate indication downstream AID
1100 Transmission of info 4
Activate indication loop
Send single zeros
AIL
1110 Transmission of info 4,
switching of test loop 2
SSZ
0010 Transmission of pseudo-ternary pulses at
2-kHz frequency (x)
Indication (upstream)
Abbr. Code Remarks
Timing
TIM
0000 Clocks are required
Lost signal level
LSL
0001 No receive level
Lost framing upstream
Error indication
RSYU 0100 Receiver is not synchronous
EI 0110 RST and SCZ both active
ARU 1000 Info 1 received
Activate request upstream
Activate indication upstream
AIU
DIU
1100 Synchronous receiver
Deactivate indication
upstream
1111 Timer (32 ms) expired or info 0 received
(during 16 ms) after deactivation request
(x) unconditional commands
Semiconductor Group
180
INFINEON [ Infineon ]
