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(yè)數(shù)： 44/62頁(yè)
文件大?。?/td> 715K
代理商： XRT7302
XRT7302
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
á
PRELIMINARY
REV. 1.1.6
40
Disabling the ALOS Detector
For debugging purposes it may be useful to disable
the ALOS Detector in the XRT7302. If the XRT7302
is operating in the HOST Mode, the ALOS Detector
can be disabled by writing a "1" into the ALOSDIS(n)
bit-field in Command Register CR2.
2. The Digital LOS (DLOS) Declaration/Clearance
Criteria
A given Channel(n) in the XRT7302 declares a Digital
LOS (DLOS(n)) condition if the XRT7302 detects
160±32 or more consecutive "0’s" in the incoming da-
ta.
The channel clears DLOS if it detects four consecu-
tive sets of 32 bit-periods, each of which contains at
least 10 "1’s" (e.g., average pulse density of greater
than 33%).
Monitoring the State of DLOS
If the XRT7302 is operating in the HOST Mode the
state of DLOS(n) of Channel(n) can be polled or mon-
itored by reading in the contents of Command Regis-
ter CR0.
If the DLOS(n) bit-field contains a “1”, then the corre-
sponding Channel(n) is currently declaring a DLOS
condition. If the DLOS(n) bit-field contains a “0”, the
Channel(n) is currently declaring the DLOS condition.
Disabling the DLOS Detector
For debugging purposes, it is useful to be able to dis-
able the DLOS(n) detector in the XRT7302. If the
XRT7302 is operating in the HOST Mode, the DLOS
Detector can be disabled by writing a “1” into the
DLOSDIS(n) bit-field of Command Register CR2.
COMMAND REGISTER CR2-(N)
N
OTE
:
Setting both the ALOSDIS(n) and DLOSDIS(n) bit-
fields to "1" disables LOS Declaration by Channel(n).
3.6.3
Muting the Recovered Data while the LOS
is being Declared
In some applications it is not desirable for a channel
of the XRT7302 to recover data and route it to the Re-
ceiving Terminal while the channel is declaring an
LOS condition. Consequently, the XRT7302 includes
an LOS Muting feature. This feature if enabled caus-
es a given channel to halt transmission of the recov-
ered data to the Receiving Terminal while the LOS
condition is "true". In this case, the RPOS(n) and
RNEG(n) output pins are forced to "0". Once the LOS
condition has been cleared, the channel resumes
normal transmission of the recovered data to the Re-
ceiving Terminal.
This feature is available whenever the XRT7302 is
operating in the HOST or Hardware Mode.
a. Operating in the Hardware Mode.
To enable the MUTing upon LOS feature for all chan-
nels of the XRT7302, pull the LOSMUTEN output pin
"High".
b. Operating in the HOST Mode.
COMMAND REGISTER CR2-(N)
D4
D3
D2
D1
D0
Reserved
ENDECDIS(n)
ALOSDIS(n)
DLOSDIS(n)
REQEN(n)
X
X
1
X
X
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
D4
D3
D2
D1
D0
Reserved
ENDECDIS(n)
ALOSDIS(n)
DLOSDIS(n)
REQEN(n)
X
X
X
1
X
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