參數(shù)資料
型號： XRT73L02
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)： 43/62頁
文件大小： 716K
代理商： XRT73L02
á
XRT73L02
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
PRELIMINARY
REV. P1.1.0
39
3.6.2
for DS3 and STS-1 Applications
The LOS Declaration/Clearance Criteria
When the XRT73L02 is operating in the DS3 or STS-
1 Mode, each channel in the XRT73L02 declares and
clears LOS based upon the following two criteria:
Analog LOS (ALOS) Declaration/Clearance Crite-
ria
Digital LOS (DLOS) Declaration/Clearance Crite-
ria
In the DS3 Mode, the LOS output (RLOS) is simply
the logical "OR" of the ALOS and DLOS states.
1. The Analog LOS (ALOS) Declaration/Clearance
Criteria
A channel in the XRT73L02 declares an Analog LOS
(ALOS_(n)) Condition if the amplitude of the incoming
line signal drops below a specific amplitude as de-
fined by the voltage at the LOSTHR input pin and
whether the Receive Equalizer is enabled or not.
Table 5 presents the various voltage levels at the
LOSTHR input pin, the state of the Receive Equalizer,
and the corresponding ALOS (Analog LOS) threshold
amplitudes.
Declaring ALOS
A Channel (n) in the XRT73L02 declares ALOS_(n)
whenever the amplitude of the receive line signal falls
below the signal levels to declare ALOS, as specified
in Table 5.
Clearing ALOS_(n)
A Channel (n) clears ALOS_(n) whenever the ampli-
tude of the receive line signal increases above the
signal levels to declare ALOS, as specified in Table 5.
There is approximately a 2dB hysteresis in the re-
ceived signal level that exists between declaring and
clearing ALOS_(n) in order to prevent chattering in
the RLOS_(n) output signal.
Monitoring the State of ALOS_(n)
If the XRT73L02 is operating in the HOST Mode, the
state of ALOS_(n) of Channel (n) can be polled or
monitored by reading in the contents of Command
Register CR0.
If the ALOS_(n) bit-field contains a "1", then the cor-
responding Channel (n) is currently declaring an
ALOS condition. If the ALOS_(n) bit-field contains a
"0", then the channel is not currently declaring an
ALOS condition.
T
ABLE
5: T
HE
ALOS (A
NALOG
LOS) D
ECLARATION
AND
C
LEARANCE
T
HRESHOLDS
FOR
A
GIVEN
SETTING
OF
LOSTHR
AND
REQEN
FOR
DS3
AND
STS-1 A
PPLICATIONS
A
PPLICATION
REQEN S
ETTING
LOSTHR S
ETTING
S
IGNAL
L
EVEL
TO
D
ECLARE
ALOS
S
IGNAL
L
EVEL
TO
C
LEAR
ALOS
DS3
1
0
<55mV
>220mV
1
1
<22mV
>90mV
0
0
<35mV
>155mV
0
1
<17mV
>70mV
STS-1
1
0
<75mV
>270mV
1
1
<25mV
>115mV
0
0
<55mV
>210mV
0
1
<20mV
>90mV
COMMAND REGISTER CR0-(N)
D4
D3
D2
D1
D0
RLOL_(n)
RLOS_(n)
ALOS_(n)
DLOS_(n)
DMO_(n)
Read Only
Read Only
Read Only
Read Only
Read Only
相關PDF資料
PDF描述
XRT73L03A 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L03AIV 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L03B 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L03BIV 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L04A 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
相關代理商/技術參數(shù)
參數(shù)描述
XRT73L02M 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MES 功能描述:網(wǎng)絡控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
XRT73L02MIV 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MIV-F 功能描述:外圍驅(qū)動器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT73L02MIVTR-F 功能描述:網(wǎng)絡控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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