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參數(shù)資料
| 型號(hào)： | XRT7302 |
| 廠商： | Exar Corporation |
| 英文描述： | 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元) |
| 中文描述： | 2頻道E3/DS3/STS-1線路接口單元（2通道E3/DS3/STS-1線接口單元） |
| 文件頁數(shù)： | 38/62頁 |
| 文件大小： | 715K |
| 代理商： | XRT7302 |
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XRT7302
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
á
PRELIMINARY
REV. 1.1.6
34
3.2
T
HE
R
ECEIVE
E
QUALIZER
B
LOCK
The purpose of this block is to equalize the incoming
distorted signal due to cable loss. The Receive
Equalizer attempts to restore the shape of the line
signal so that the transmitted data and clock can be
recovered reliably.
Design Considerations for DS3 and STS-1
Applications
When installing equipment into environments depict-
ed in Figure 17, we recommend that the Receive
Equalizer be enabled by setting the REQEN(n) input
pin for Channel(n) or the respective bit-fields to "1".
The only time that the Receive Equalizer should be
disabled is when an off-chip equalizer is in the Re-
ceive path between the Digital Cross-Connect system
and the RTIP/RRing input pins, or in applications
where the Receiver is monitoring the transmit output
signal directly.
Design Considerations for E3 Applications or if
the Overall Cable Length is known
Figure 17 indicates the following:
a. The length of cable between the Transmitting Ter-
minal and the Digital Cross-Connect system can
range between 0 and 450 feet.
b. The length of cable between the Digital Cross-Con-
nect system and the Receive Terminal can range be-
tween 0 and 450 feet.
Consequently, the overall cable length between the
Transmitting Terminal and the Receiving Terminal can
range between very short cable length (e.g., near 0
feet) up to 900 feet.
If during System Installation the overall cable length is
known, to optimize the performance of the XRT7302
in terms of receive jitter performance, etc., enable or
disable the Receive Equalizer based upon the follow-
ing recommendations:
The Receive Equalizer should be turned ON if the
Receive Section of a given channel is going to re-
F
IGURE
17. T
HE
T
YPICAL
A
PPLICATION
FOR
THE
S
YSTEM
I
NSTALLER
Digital Cross-Connect
System
Transmitting
Terminal
Receiving
Terminal
0 to 450 feet of Cable
Pulses that are
compliant to the
Isolated DSX-3 or
STSX-1 Pulse Template
Requirement
0 to 450 feet of
Cable
DSX-3
or
STSX-1
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| XRT73L02M | TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L02MIV | TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L02 | 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元) |
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| XRT73L00 | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
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