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| 型號(hào)： | T7630 |
| 英文描述： | T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator-II) |
| 中文描述： | T7630雙T1/E1的5.0V的短途終結(jié)者（終結(jié)者-Ⅱ） |
| 文件頁(yè)數(shù)： | 37/210頁(yè) |
| 文件大?。?/td> | 3075K |
| 代理商： | T7630 |
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Lucent Technologies Inc.
37
Preliminary Data Sheet
October 2000
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator II)
Line Interface Unit: Transmit
(continued)
During E1 operation, the LIU transmitter TTIP and TRING pins will perform as specified in Table 10.
Table 10. CEPT Transmitter Specifications
1. With the line circuitry specified in Table 14, measured at the transformer secondary.
2. Using Lucent transformer 2795D or 2795C and components in Table 14.
Parameter
Min
Typ
Max
Unit
Specification
ITU-T G.703
Output Pulse Amplitude
1
:
75
120
Output Pulse Width at Line Side of
Transformer
1
Output Pulse Width at Device Pins TTIP
and TRING
1
Positive/Negative Pulse Imbalance:
Pulse Amplitude
Pulse Width
Zero Level (percentage of pulse
amplitude)
Return Loss:
2
120
51 kHz to 102 kHz
102 kHz to 2.048 MHz
2.048 MHz to 3.072 MHz
Return Loss:
2
75
51 kHz to 102 kHz
102 kHz to 3.072 MHz
2.13
2.7
219
2.37
3.0
244
2.61
3.3
269
V
V
ns
224
244
264
ns
–4
–4
–5
±1.5
±1
0
4
4
5
%
%
%
9
15
11
7
9
—
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
CH-PTT
ETS 300 166:
1993
Line Interface Unit: Jitter Attenuator
A selectable jitter attenuator is provided for narrow-
bandwidth jitter transfer function applications. When
placed in the LIU receive path, the jitter attenuator pro-
vides narrow-bandwidth jitter filtering for line-synchroni-
zation. The jitter attenuator can also be placed in the
LIU transmit path to provide clock smoothing for appli-
cations such as synchronous/asynchronous demulti-
plexers. In these applications, TLCK-LIU will have an
instantaneous frequency that is higher than the data
rate and some TLCK-LIU periods are suppressed
(gapped) in order to set the average long-term TLCK-
LIU frequency to within the transmit line rate specifica-
tion. The jitter attenuator will smooth the gapped clock.
Generated (Intrinsic) Jitter
Generated jitter is the amount of jitter appearing on the
output port when the applied input signal has no jitter.
The jitter attenuator outputs a maximum of 0.04 UI
peak-to-peak intrinsic jitter.
Jitter Transfer Function
The jitter transfer function describes the amount of jitter
that is transferred from the input to the output over a
range of frequencies. The jitter attenuator exhibits a
single-pole roll-off (20 dB/decade) jitter transfer charac-
teristic that has no peaking and a nominal filter corner
frequency (3 dB bandwidth) of less than 4 Hz for DS1
operation and approximately 10 Hz for CEPT opera-
tion. Optionally, a lower bandwidth of approximately
1.25 Hz can be selected in CEPT operation by setting
JABW0 = 1 (register LIU_REG4, bit 5) for systems
desiring compliance with ETSI-TBR12 and TBR13 jitter
attenuation requirements. The reset default is JABW0
= 0. For a given frequency, different jitter amplitudes will
cause a slight variation in attenuation because of finite
quantization effects. Jitter amplitudes of less than
approximately 0.2 UI will have greater attenuation than
the single-pole roll-off characteristic. The jitter transfer
curve is independent of data patterns. Typical jitter
transfer curves of the jitter attenuator are given in Fig-
ures 13 and 15.
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