參數(shù)資料
型號(hào): XRT86VL3X
廠商: Exar Corporation
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁(yè)數(shù): 109/149頁(yè)
文件大?。?/td> 1274K
代理商: XRT86VL3X
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XRT86VL3X
102
REV. 1.2.0
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
problem further down the line and its transmission is not being received at the CPE. The Figure below
illustrates the scenario in which the DS1 connection from the Repeater to CPE is broken.
The Repeater, upon detection of Yellow Alarm originated from the CPE, will transmit a Blue Alarm, also known
as Alarm Indication Signal (AIS) to the CO. Blue alarm is an all ones pattern indicating that the equipment is
functioning but unable to offer service due to failures originated from remote side. It is sent such that the
equipment downstream will not lose clock synchronization even though no meaningful data is received. The
Figure below illustrates this scenario in which the Repeater is sending an AIS to CO upon detection of Yellow
alarm originated from the CPE.
F
IGURE
97. G
ENERATION
OF
Y
ELLOW
A
LARM
BY
THE
CPE
UPON
DETECTION
OF
LINE
FAILURE
DS1 Receive
Framer Block
DS1 Transmit
Framer Block
DS1 Receive
Framer Block
DS1 Transmit
Framer Block
DS1
Transmit
Section
DS1
Transmit
Section
DS1
Receive
Section
DS1
Receive
Section
CO
Repeater
CPE
The DS1 line is
broken
CPE declares Red
Alarm internally
Yellow
Alarm
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XRT91L306 STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
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