參數(shù)資料
型號(hào)： XRT75L03D
廠商： Exar Corporation
英文描述： THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
中文描述： Three頻道E3/DS3/STS-1線路接口單元與SONET DESYNCHRONIZER
文件頁數(shù)： 131/134頁
文件大?。?/td> 659K
代理商： XRT75L03D
á
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
XRT75L03D
REV. 1.0.0
126
9.8.3
How does the XRT75L03D permit the user to comply with the SONET APS Recovery Time
requirements of 50ms (per Telcordia GR-253-CORE)
Telcordia GR-253-CORE, Section 5.3.3.3 mandates that the "APS Completion" (or Recovery) time be 50ms or
less. Many of our customers interpret this particular requirement as follows.
"From the instant that an APS is initiated on a high-speed SONET signal, all lower-speed SONET traffic (which
is being transported via this "high-speed" SONET signal) must be fully restored within 50ms. Similarly, if the
"high-speed" SONET signal is transporting some PDH signals (such as DS1 or DS3, etc.), then those entities
that are responsible for acquiring and maintaining DS1 or DS3 frame synchronization (with these DS1 or DS3
data-streams that have been de-mapped from SONET) must have re-acquired DS1 or DS3 frame
synchronization within 50ms" after APS has been initiated."
The XRT75L03D was designed such that the DS3 signals that it receives from a SONET Mapper device and
processes will comply with the Category I Intrinsic Jitter requirements per Telcordia GR-253-CORE.
Reference 1 documents some APS Recovery Time testing, which was performed to verify that the Jitter
Attenuator blocks (within the XRT75L03D) device that permit it to comply with the Category I Intrinsic Jitter
Requirements (for DS3 Applications) per Telcordia GR-253-CORE, do not cause it to fail to comply with the
"APS Completion Time" requirements per Section 5.3.3.3 of Telcordia GR-253-CORE. However, Table 3
presents a summary of some APS Recovery Time requirements that were documented within this test report.
Table 3,
N
OTE
:
The APS Completion (or Recovery) time requirement is 50ms.
Configuring the XRT75L03D to be able to comply with the SONET APS Recovery Time Requirements of
50ms
Quite simply, the user can configure a given Jitter Attenuator block (associated with a given channel) to (1)
comply with the "APS Completion Time" requirements per Telcordia GR-253-CORE, and (2) also comply with
the "Category I Intrinsic Jitter Requirements per Telcordia GR-253-CORE (for DS3 applications) by making
sure that Bit 4 (SONET APS Recovery Time Disable Ch_n), within the Jitter Attenuator Control Register is set
to "0" as depicted below.
T
ABLE
33: M
EASURED
APS R
ECOVERY
T
IME
AS
A
FUNCTION
OF
DS3
PPM
OFFSET
DS3 PPM O
FFSET
(
PER
W&G ANT-20SE)
M
EASURED
APS R
ECOVERY
T
IME
(
PER
L
OGIC
A
NALYZER
)
-99 ppm
1.25ms
-40ppm
1.54ms
-30 ppm
1.34ms
-20 ppm
1.49ms
-10 ppm
1.30ms
0 ppm
1.89ms
+10 ppm
1.21ms
+20 ppm
1.64ms
+30 ppm
1.32ms
+40 ppm
1.25ms
+99 ppm
1.35ms
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT75L03DES 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 3 CH T3/E3/STS1 LIU+DESYNCH3.3V RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
XRT75L03DIV 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 3CHNNEL E3/DS3/STS 1 SONET DE-SYNCH RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT75L03DIV-F 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 3-Ch DS3, E3, STS-1 RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT75L03DIVTR 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 3CHNNEL E3/DS3/STS 1 SONET DE-SYNCH RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
XRT75L03DIVTR-F 功能描述:接口 - 專用 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59
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