Acterna ANT-5 - ATM LED Indicators; Further Reading; ATM Reference; PTI Coding

Asynchronous Transfer Mode – ATM
Page 110 Acterna ANT-5
zoomed feature is it allows time to be shown in different units for maximum effect.
6.10 ATM LED Indicators
The sixteen on-screen LEDS relevant to ATM testing are arranged as shown below:
LOS Loss of Signal Lof/Oof Loss of Frame
RS/MS Regen / Multiplex Sections Bx Section or path error monitor
AU Administrative Unit Fas/Crc FAS / CRC Error
HP High Order Path LP Low Order Path
TU Tributary Unit ATM VP Virtual Path alarm
P-RDI PDH Remote Defect Ind. ATM VC Virtual Channel alarm
P-AIS PDH AIS LCD Loss of Cell Delineation
TSE Test Sequence Err. (Bit Err.) LSS Loss of Sequence Sync.
6.11 Further reading
A useful resource is Acterna’s ATM Pocket Guide. (Literature order number:
TP/EN/PG04/0400/AE Repl. 1020.) This guide introduces the basics of ATM and gives
some details on various measurement methods.
6.12 ATM Reference
6.12.1 PTI coding
As per ITU-T recommendation I.361, three bits are used for PT indentification.
Number PTI value Interpretation
0 000 User data cell, congestion not experienced
1 001 User data cell, congestion not experienced
2 010 User data cell, congestion experienced
3 011 User data cell, congestion experienced
4 100 OAM F5 segment associated cell
5 101 OAM F5 end-to-end associated cell
6 110 Resource management cell
7 111 Reserved for future VC functions