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參數(shù)資料
| 型號： | 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)： | 43/62頁 |
| 文件大?。?/td> | 715K |
| 代理商： | XRT7302 |
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PRELIMINARY
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.6
39
3.6.2
for DS3 and STS-1 Applications
The LOS Declaration/Clearance Criteria
When the XRT7302 is operating in the DS3 or STS-1
Mode, each channel in the XRT7302 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 XRT7302 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 XRT7302 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 XRT7302 is operating in the HOST Mode, the
state of ALOS(n) of Channel(n) can be polled or mon-
itored by reading in the contents of Command Regis-
ter CR0.
If the ALOS(n) bit-field contains a "1", then the corre-
sponding 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 condi-
tion.
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
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PDF描述 |
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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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| XRT73L03AIV | 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
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|---|---|
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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 |
| XRT73L00A | 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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| XRT73L00AIV | 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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