PXB4220E Infineon Technologies AG, PXB4220E Datasheet - Page 230
PXB4220E
Manufacturer Part Number
PXB4220E
Description
Interworking Element for 8 E1/T1 Lines
Manufacturer
Infineon Technologies AG
Datasheet
1.PXB4220E.pdf
(290 pages)
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8.3
This section shows the results of jitter analysis of the ICRC. The device is intended to be
used with an external jitter attenuator. For this purpose Infineon’s FALC-LH was used.
Results are shown with and without jitter attenuator. Measurements were done using a
Wandel & Goltermann ANT20 for IWE8 in T1 mode with FALC-LH and Wandel &
Goltermann PFJ-8 for the bare IWE8 in E1 or T1 mode.
8.3.1
The jitter tolerance falls with 20 dB per decade, It is independent from the PLL gain
("ASF").
For the bare device the jitter tolerance meets the requirements of ITU-T G.823 and I.431
at medium and low frequencies. At frequencies lower than 1 KHz the jitter tolerance is
more than 20 UI. At high frequencies it is lower than the requirements.
In combination with an jitter attenuator the requirements are met. Jitter tolerance at high
frequencies is better than 0.2 UI.
Figure 39
Data Sheet
100,0
10,0
1,0
0,1
1
Jitter Characteristics of the Internal Clock Recovery Circuit
ACM Jitter Tolerance in E1 Mode
ACM Jitter Tolerance in E1 m ode, CDV=0, ASF=4
ACM Jitter Tolerance in E1 Mode without Jitter Attenuator
10
100
1000
10000
230
PXB 4219E, PXB 4220E, PXB 4221E
100000 1000000 Frequency [Hz]
Application Hints
-50 ppm
0 ppm
+50 ppm
ITU G.823
and I.431
IWE8, V3.4
2003-01-20
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