VITESSE
SEMICONDUCTOR CORPORATION
Datasheet
1.0625 Gbits/sec Fibre
Channel Transceiver
VSC7126
Figure 8: Transmitter Jitter Measurement Method
Random Jitter Measurement
BERT
Pattern
Generator
DATA
DATA
Trigger
53.125MHz
53.125MHz
Digitizing
Scope
CLK = 1.0625 GHz
DATA = 00000 0000011111 11111
VSC7126
1.0625 Gbit/s
Single-Ended Measurement
RJ
TX
TX+
TX-
TBC
-K28.7 -K28.7
0011111000 0011111000
T00:19
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
Trigger
53.125
Generator PAT SYNC
Digitizing
Scope
CLK = 1.0625 GHz
DATA = 00000 0000011111 11111
53.125MHz
VSC7126
1.0625 Gbit/s
Single-Ended Measurement
TX
TX+
TX-
TBC
-K28.5 +K28.5
0011111010 1100000101
DJ
T0:19
TRIGGER
DATA
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.
20 bit time
19 bit time
18 bit time
17 bit time
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 ]
