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參數(shù)資料
| 型號： | T7290A |
| 廠商： | Lineage Power |
| 英文描述： | DS1/T1/CEPT/E1 Line Interface(DS1/T1/CEPT/E1 線接口) |
| 中文描述： | DS1/T1/CEPT/E1線路接口（DS1/T1/CEPT/E1線接口） |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 420K |
| 代理商： | T7290A |
Data Sheet
April 1998
T7290A DS1/T1/CEPT/E1 Line Interface
11
Lucent Technologies Inc.
Jitter Attenuator
Jitter transfer functions describe the amount of jitter
that is transferred from the input to the output of the
specified equipment. The jitter transfer functions are
affected by the jitter attenuator circuitry, which can be
placed in the receive data path, placed in the transmit
data path, or bypassed. Placement of this circuit is con-
trolled as described in Table 6. The external clock
(EXCLK) must be present for the attenuation function
to operate. When attenuation is selected, the T7290A
device exhibits a jitter transfer function that has no
peaking and a single 3.6 Hz pole frequency (DS1) or
4.8 Hz pole frequency (CEPT). Figure 7 displays a typ-
ical DS1 jitter transfer function for a constant input jitter
amplitude of 2.0 U.I. peak-to-peak.
The amount of generated output jitter when no input jit-
ter is present is measured by using the scheme shown
in Figure 8. The jitter filters depicted represent the
AT&T PUB 62411 specification for a 1.544 MHz data
rate. The jitter produced at the labeled points does not
exceed the following peak-to-peak levels: 0.05 U.I. at
point 1, 0.025 U.I. at point 2, 0.025 U.I. at point 3, and
0.02 U.I. at point 4. A similar test can be performed for
ITU-T I.431 qualification at the 2.048 MHz data rate, in
which two jitter filters are 20 Hz—100 kHz (0.125 U.I.)
and 700 Hz—100 kHz (0.02 U.I.).
The jitter tolerance of the attenuator meets the require-
ments of the TR-TSY-000009, AT&T PUB 43802, and
ITU-T G.823 (see Figure 3). The attenuator also
ensures that jitter accommodation is a minimum of
28 U.I. peak-to-peak (DS1) or 40 U.I. peak-to-peak
(CEPT) (1 U.I. = 648 ns [T1/DS1] or 488 ns [CEPT])
during attenuation. The jitter attenuation function is
identical when placed in either transmit or receive path.
Ideally, the tolerance of the attenuator is
±
32 bits
(64 U.I.). However, if
f (Hz) = frequency (EXCLK) –
frequency (input clock) and N = 23 (DS1) or 30.5
(CEPT), then the tolerance is degraded and equals:
Figure 9 shows the phase step response (DS1) of the
attenuator given
f. The response is based on a phase
offset (U.I.) generated by the read pointer of the buffer.
It is this phase offset that degrades the attenuator's tol-
erance.
64 2
RND–UPABS
f
(
)
N
1
+
×
–
(U.I.)
Data Points (Hz, dB)
Figure 7. Jitter Transfer Function of the Jitter Attenuator
TR-TSY-000009,
AT&T PUB 43802
1, 0.1
350, 0.1
2.5k, –33.6
15k, –49.2
ITU-T G.735,
ITU-T I.431
10, 0.5
40, 0.5
400, –19.5
15k, –19.5
5-1311(C)r.4
J
0
–10
–20
–30
1
10
40
100
2.5k
15k
JITTER FREQUENCY (Hz)
–40
–50
–60
–70
350
1k
10k
400
20 dB/
DECADE
TYPICAL
PERFORMANCE
20 dB/DECADE
20 dB/DECADE
40 dB/DECADE
ITU-T G.735,
ITU-T I.431
TR-TSY-
000009,
PUB 43802
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T-7290A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:T7290A DS1/T1/CEPT Line Interface |
| T-7290A-EL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:T7290A DS1/T1/CEPT Line Interface |
| T-7290A--EL | 制造商:Alcatel-Lucent 功能描述:DATACOM, PCM TRANSCEIVER, PDSO28 |
| T7290A-EL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:T7290A DS1/T1/CEPT Line Interface |
| T-7290A--EL-DT | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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