pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 76

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

2.4.2
The 4B3T frame structure provides a 1 kbit/s M(aintenance)-channel for the transfer of
remote loopback commands and error indications.
Loopback Commands
The LT station uses the M-channel to request remote loopbacks. Loopback commands
are coded with a series of ’0’ and ’+’ symbols.
• A continuous series of ’+’ requests for loopback 2 activation in the NT
• A continuous series of ’0’ requests for deactivation of any loopback
The NT station reacts as soon as the pattern has been detected in 8 consecutive
symbols.
Error Indications
The NT U-transceiver reports line code violations via the M-channel to the exchange by
setting one M-Bit to ’+’ polarity.
Transparent Messages
The exchange of Transparent Messages via the Transparent Channel is not supported
by the T-SMINT
2.4.3
Each 4 bit block of binary data is coded into 3 ternary symbols of MMS 43 block code
according to
The number of the next column to be used, is given at the right hand side of each block.
The left hand signal elements in the table (both ternary and binary) are transmitted first.
•
Table 15
t
0
0
0
0
1
1
1
Data Sheet
0
1
1
0
0
1
0
0
1
0
1
1
1
0
Maintenance Channel
Coding from Binary to Ternary Data
Table
1
1
0
0
1
0
1
MMS 43 Coding Table
â
IX.
S1
t
0
–
–
+
+
0
+
15.
–
0
+
–
0
+
–
+
+
0
0
–
–
+
1
1
1
1
1
1
2
S2
t
0
–
–
+
+
0
+
–
0
+
–
0
+
–
62
+
+
0
0
–
–
+
2
2
2
2
2
2
3
S3
t
0
–
–
+
+
0
+
–
0
+
–
0
+
–
+
+
0
0
–
–
+
Functional Description
3
3
3
3
3
3
4
S4
t
0
–
–
+
+
0
–
PEF 81902
–
0
+
–
0
+
–
2001-11-12
+
+
0
0
–
–
–
4
4
4
4
4
4
1