xrt75r12 Exar Corporation, xrt75r12 Datasheet - Page 43

• Manufacturer Part Number: xrt75r12
• Description: Twelve Channel E3/ds3/sts-1 Line Interface Unit With Jitter
• Manufacturer: Exar Corporation

REV. 1.0.4
The jitter attenuator within the XRT75R12 meets the latest jitter attenuation specifications and/or jitter transfer
characteristics as shown in the
Jitter Generation is defined as the process whereby jitter appears at the output port of the digital equipment in
the absence of applied input jitter. Jitter Generation is measured by sending jitter free data to the clock and
data recovery circuit and measuring the amount of jitter on the output clock or the re-timed data. Since this is
essentially a noise measurement, it requires a definition of bandwidth to be meaningful. The bandwidth is set
according to the data rate. In general, the jitter is measured over a band of frequencies.
F
5.3.1
IGURE
(
34368
44736
51840
KBITS
R
ATE
28. J
)
J
ITTER
ITTER
GR-253 CORE
GR-253 CORE
GR-499, Cat II
GR-499, Cat I
ETSI-TBR-24
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
G
M
G.823
T
ENERATION
RANSFER
ASK
A 2
A 1
R
Figure
EQUIREMENTS AND
F 1
T
ABLE
(H
100
F1
10
10
10
10
Z
28.
)
12: J
ITTER
J IT T E R F R E Q U E N C Y (k H z )
56.6k
(H
300
10k
40k
F2
40
J
ITTER
Z
T
)
RANSFER
40
A
F 2
TTENUATOR
(H
P
F3
3
-
-
-
-
ASS
K
Z
)
M
F 3
ASKS
P
ERFORMANCE
(
800
300k
400k
K
15k
15k
F4
H
F 4
Z
K
)
A1(dB)
0.5
0.1
0.1
0.1
0.1
XRT75R12
A2(dB)
-19.5
-
-
-
-