VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gbits/sec Fibre
Channel Transceiver
Figure 8: Transmitter Jitter Measurement Method
Random Jitter Measurement
Datasheet
VSC7126
BERT
Pattern
Generator
DATA
DATA
53.125MHz
Trigger
CLK = 1.0625 GHz
DATA = 00000 0000011111 11111
Digitizing
Scope
53.125MHz
RJ
-K28.7 -K28.7
0011111000 0011111000
VSC7126
TX
TBC
T00:19
TX+
TX-
1.0625 Gbit/s
Single-Ended Measurement
Random jitter (RJ) measurements performed according to Fibre Channel 4.3 Annex A, Test Methods, Section
A.4.4. Measure standard deviation of all 50% crossing points. Peak to peak RJ is + 7 sigma of distribution.
Deterministic Jitter Measurement
BERT
DATA
Pattern
Generator
PAT SYNC
CLK = 1.0625 GHz
DATA = 00000 0000011111 11111
53.125
Trigger
Digitizing
Scope
53.125MHz
VSC7126
TX
TBC
DJ
-K28.5 +K28.5
0011111010 1100000101
TX+
TX-
1.0625 Gbit/s
Single-Ended Measurement
T0:19
TRIGGER
DATA
20 bit time
19 bit time
18 bit time
17 bit time
Deterministic jitter (DJ) mea-
surements performed according to
Fibre Channel 4.3 Annex A, Test
Methods, Section A.4.3. Measure
time of all the 50% points of all ten
transitions. DJ is the range of the
timing variation from expected.
12 bit time
10 bit time
9 bit time
8 bit time
7 bit time
2 bit time
Page 10
©
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
G52148-0, Rev. 4.3
3/4/99
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
