參數(shù)資料
型號： PE-65967
廠商： Exar Corporation
英文描述： E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述： E3/DS3/STS-1線路接口單元
文件頁數(shù)： 36/55頁
文件大?。?/td> 608K
代理商： PE-65967
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.1
á
32
3.6.2
for DS3 and STS-1 Applications
When the XRT7300 is operating in the DS3 or STS-1
Modes it declares and clears LOS based on either:
Analog LOS (ALOS) Declaration/Clearance Criteria
or,
Digital LOS (DLOS) Declaration/Clearance Criteria
The LOS Declaration/Clearance Criteria
In the DS3 or STS-1 Modes the LOS output (RLOS)
is simply the logical OR of the ALOS and DLOS
states.
1. The Analog LOS (ALOS) Declaration/Clear-
ance Criteria
The XRT7300 declares an Analog LOS (ALOS) Con-
dition if the amplitude of the incoming line signal
drops below a specific amplitude as defined by the
state of the LOSTHR input pin.
Declaring ALOS
The XRT7300 declares an ALOS (Analog LOS) con-
dition whenever the amplitude of the input signal falls
below the Signal Level to Declare ALOS levels speci-
fied in Table 4.
Clearing ALOS
The XRT7300 clears ALOS whenever the amplitude
of the input signal rises above the Signal Level to
Clear ALOS levels specified in Table 4.
N
OTE
:
There is approximately a 2dB hysteresis in the
received signal level that exists between declaring and
clearing ALOS in order to prevent chattering in the RLOS
output signal.
Monitoring the State of ALOS
If the XRT7300 is operating in the HOST Mode, the
state of ALOS can be polled or monitored by reading
in the contents of Command Register 0. The bit-for-
mat of Command Register 0 is presented below.
If the ALOS bit-field contains a “1”, the XRT7300 is
currently declaring an ALOS condition. If the ALOS
bit-field contains a “0”, the device is NOT currently de-
claring an ALOS condition.
Disabling the ALOS Detector
It is useful to disable the ALOS Detector in the
XRT7300 for debugging purposes. If the XRT7300 is
operating in the HOST Mode, the ALOS Detector can
T
ABLE
4: T
HE
ALOS D
ECLARATION
AND
C
LEARANCE
T
HRESHOLDS
FOR
A
G
IVEN
S
ETTING
OF
LOSTHR (DS3
AND
STS-1 A
PPLICATIONS
)
FOR
E
QUALIZER
E
NABLED
OR
D
ISABLED
A
PPLICATION
LOSTHR S
ETTING
S
IGNAL
L
EVEL
TO
D
ECLARE
ALOS
S
IGNAL
L
EVEL
TO
C
LEAR
ALOS
LOS L
EVEL
W
ITH
E
QUALIZER
E
NABLED
DS3
0
< 55mV
> 220mV
1
< 22mV
> 70mV
Sonet STS-1
0
< 75mV
> 270mV
1
< 25mV
> 110mV
LOS L
EVEL
W
ITH
E
QUALIZER
D
ISABLED
DS3
0
< 35mV
> 155mV
1
< 17mV
> 70mV
Sonet STS-1
0
< 55mV
> 210mV
1
< 20mV
> 90mV
COMMAND REGISTER CR0 (ADDRESS = 0X00)
D4
D3
D2
D1
D0
RLOL
RLOS
ALOS
DLOS
DMO
Read
Only
Read
Only
Read
Only
Read
Only
Read
Only
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PE65967NLT 制造商:Pulse Electronics Corporation 功能描述:
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