Atec Acterna-JDSU-ANT-20SE - Manual (Page 20)

The ATM module comprises:
± Generation and analysis of ATM cell streams
± ATM layer cell transfer performance as per ITU-T I.356, O.191
± AAL-1 segmentation/reassembly for circuit emulation
± STS-3c/STM-1 with C4 ATM mapping, ANSI T1.105/107,
ITU-T G.707
± F4/F5 fault management OAM flow for AIS and RDI as per
ITU-T I.610, ATM forum UNI 3.1
Generator unit
Bit rates of the framed cell streams . . . . . . . . . . . . . . . . . 155.520 Mbit/s
Cell scrambler X 43 +1 (ITU-T). . . . . . . . . . . can be switched on and off
Test cell channel
Adjustable from . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 149.760 Mbit/s
Header setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . editor
Load setting in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mbit/s, Cells/sec, %
Test cells, payload pattern
AAL-0, Pseudo-Random
Bit Sequences (PRBS) . . . . . . . . . . . . . . . . . . . . . . . . 2 11 ±1, 2 15 ±1, 2 23 ±1
AAL-1, Pseudo-Random
Bit Sequences (PRBS) . . . . . . . . . . . . . . . . . . . . . . . . 2 11 ±1, 2 15 ±1, 2 23 ±1
Programmable word, length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 bits
Test pattern for ATM performance analysis, with
Sequence number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 bytes
Time stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 bytes
Error correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CRC-16
Load profiles
Equidistant, setting range . . . . . . . . . . . . . . . . . . . 1 to 10 000 cell times
Constant Bit Rate (CBR), setting range . . . . . . . . . . . . 0.01% to 100%
Variable Bit Rate (VBR), settings
Peak cell rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1% to 100%
Mean cell rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1% to 100%
Burst size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 1023 cell times
Burst period . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 to 32 767 cell times
Error insertion
Physical layer as with ANT-20SE basic instrument ATM layer, AAL:
Correctable and non-correctable header errors
± AAL-0, cell payload bit errors
± AAL-1, sequence number errors
± AAL-1, SAR-PDU bit errors
± AAL-1 SNP, CRC errors
± AAL-1 SNP, parity errors
Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . single errors, error ratio,
n errors in m cells
Alarm generation
Physical layer as with basic instrument, also:
Loss of Cell Delineation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LCD
ATM layer (for selected test cell channel):
OAM F4/F5 fault flow . . . . . . . . . . . .VP AIS, VP RDI, VP AIS+VC AIS,
VC AIS, VC RDI, VP RDI+VC RDI
Background load generator
For programming user-defined cell sequences. The sequences can be
transmitted at a selectable repetition rate.
Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 ATM channels
Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . user-selectable
Payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 filler byte, user-selectable
Circuit emulation
(for selected test cell channel)
Generation of
an asynchronous channel. . . . . . . . . . . . . . . . . . . . . . . 1544, 2048, 6312,
8448, 34 368, 44 736 kbit/s,
2048 kbit/s with PCM30 frame structure
ATM channel segmentation . . . . . . . . . . . . . . . . . . . AAL-1, ITU-T I.363
Receiver unit
Bit rates of framed cell streams . . . . . . . . . . . . . . . . . . . . 155.520 Mbit/s
Cell scrambler X 43 +1 (ITU-T). . . . . . . . . . . can be switched on and off
Measurement types
Error measurement (anomalies), statistics
Detection of the following error types:
Correctable and non-correctable header errors
± AAL-0, cell payload bit errors
± AAL-1, sequence number errors
± AAL-1, SAR-PDU bit errors
± AAL-1 SNP, CRC errors
± AAL-1 SNP, parity errors
ATM performance analysis
± Cell error ratio
± Cell loss ratio
± Cell misinsertion rate
± Mean cell transfer delay
± 2-point cell delay variation
measured between minimum and maximum cell transfer delay
values
± Cell transfer delay histogram
Number of classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Minimum class width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 ns
Maximum class width . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335 ms
Settable offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 167 ms
Offset step width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 ms
Alarm detection (defects)
Physical layer as with ANT-20SE basic instrument, also:
Loss of cell delineation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LCD
ATM layer (for selected test cell channel):
OAM F4/F5 fault flow . . . . . . . . . . . .VP AIS, VP RDI, VC AIS, VC RDI
User channel analysis
Concurrent X-Y chart (load vs. time) for:
± All user cells
± Average cell rate of a selected cell channel
± Peak cell rate of a selected cell channel
Display units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mbit/s, Cells/sec, %
Channel utilization histogram
± All user cells (ªassigned cellsº)
± A selected cell channel (ªuser cellsº)
Cell distribution of a selected cell channel with classification by:
± User cells
± F5 OAM flow
± F4 OAM flow
± User cells with CLP = 1
Circuit reassembly
(for selected test cell channel)
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AAL-1, ITU-T I.363
Error measurement on an
asynchronous channel . . . . . . . . . . . . . . . . . . . . 1544, 2048, 6312, 8448,
34 368, 44 736 kbit/s,
2048 kbit/s with PCM30 frame structure
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