参数资料
型号: DS21Q58L
英文描述: E1 Quad Transceiver
中文描述: 素E1通道收发器
文件页数: 52/74页
文件大小: 647K
代理商: DS21Q58L
DS21Q58 E1 Quad Transceiver
52 of 74
21.4.2 Undedicated Clock Jitter Attenuator
The undedicated jitter attenuator is useful for preparing a user-supplied clock for use as a transmission clock
(TCLK). AJACKI is the input pin and AJCAKO is the output pin. Clocks generated by certain types of PLL or other
synthesizers can contain too much jitter to be appropriate for transmission. Network requirements limit the amount
of jitter that can be transmitted onto the network. This feature is enabled by setting SC1CR.7 = 1 in Transceiver 1.
Figure 21-5. Jitter Tolerance
Figure 21-6. Jitter Attenuation
FREQUENCY (Hz)
U
P
)
1k
100
10
1
0.1
10
100
1k
10k
100k
DS21Q58
TOLERANCE
1
MINIMUM TOLERANCE
LEVEL AS PER
ITU G.823
40
1.5
0.2
20
2.4k
18k
FREQUENCY (Hz)
0
-20
-60
1
10
100
1k
10k
J
100k
ITU G.7XX
PROHIBITED AREA
ETS 300 011 AND TBR12
PROHIBITED AREA
40
-40
JITTER ATTENUATION CURVE
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