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參數(shù)資料
| 型號： | XRT59L91IDTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E1 SGL 3.3V 16SOIC |
| 產(chǎn)品變化通告： | Packaging Change 15/Jul/2010 |
| 標準包裝： | 1,000 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | E1 |
| 電源電壓： | 3.13 V ~ 3.46 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應商設(shè)備封裝： | 16-SOIC |
| 包裝： | 帶卷 (TR) |
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XRT59L91
17
Rev. 1.0.0
Timing Requirements associated with Declaring
and Clearing the LOS Indicator.
The XRT59L91 device was designed to meet the ITU-
T G.775 specification timing requirements for declar-
ing and clearing the LOS indicator. In particular, the
XRT59L91 device will declare LOS, between 10 and 255
UI (or E1 bit-periods) after the actual time the LOS
condition occurred. Further, the XRT59L91 device will
A ctual
O ccu rre n ce
of LO S
C ondition
Line
S ignal
is
R e stored
T im e R ange
fo r
LO S
D e claratio n
T im e R ange
fo r
LO S
C learan ce
G .775 C o m p liance
0
UI
10 U I
0
UI
10 U I
255 U I
RX IN
LO S O u tp ut P in
N o te : F o r E 1 , 1 U I = 488ns
clear the LOS indicator within 10 to 255 UI after
restoration of the incoming line signal. Figure 11
illustrates the LOS Declaration and Clearance behav-
ior, in response to first, the “Loss of Signal” event and
then afterwards, the restoration of the signal.
Figure 11. The Behavior of the LOS Output Indicator, in response to the Loss of Signal,
and the Restoration of the Signal
2.5
The “Receive Output Interface” Block
The purpose of the “Receive Output Interface” block is
to interface directly with the “Receiving Terminal
Equipment”. The “Receive Output Interface” block
outputs the data (which has been recovered from the
incoming line signal) to the “Receive Terminal Equip-
ment” via the “RxPOS and RxNEG output pins.
If the “Receive Section” of the XRT59L91 device has
received a “Positive-Polarity” pulse, via the RTIP and
RRing input pins, then the Receive Output Interface will
output a pulse at the “RxPOS” output pin.
Similarly, if the “Receive Section” of the XRT59L91
device has received a “Negative-Polarity” pulse, via
the RTIP and RRing input pins, then the Receive Output
Interface will output a pulse at the “RxNEG” output pin.
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