參數(shù)資料
型號： T7230A
廠商： Lineage Power
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
文件頁數(shù)： 42/110頁
文件大小： 752K
代理商： T7230A
Preliminary Data Sheet
T7230A Primary Access Framer/Controller
June 1997
38
Lucent Technologies Inc.
Frame Formats
(continued)
CEPT Loss of CRC-4 Multiframe Alignment Recovery Algorithms
Several optional algorithms exist in the receive framer.
CRC-4 Multiframe Alignment Algorithm with 8 ms Timer
The default algorithm is as described in ITU Rec. G.706 Section 4.2. The recommendation states that if a condition
of assumed frame alignment has been achieved, CRC-4 multiframe alignment is deemed to have occurred if at
least two valid CRC-4 multiframe alignment signals can be located within 8 ms, the time separating two CRC-4
multiframe signals being 2 ms or a multiple of 2 ms. The search for the CRC-4 multiframe alignment signal is made
only in bit 1 of NOT FAS frames. If multiframe alignment cannot be achieved within 8 ms, it is assumed that frame
alignment is due to a spurious frame alignment signal and a new parallel search for basic frame alignment is initi-
ated. The new search for the basic frame alignment is started at the point just after the location of the assumed
spurious frame alignment signal. During this parallel search for basic frame alignment, there is no indication to the
system of an RLFA state. The receive framer will continuously search for CRC-4 multiframe alignment if no other
CRC-4 multiframe algorithm is used. Once found, the receive framer will force its internal timing to this new align-
ment, if it is different from the original primary basic frame alignment:
1.
During the search for CRC-4 multiframe alignment, traffic is allowed through upon, and synchronized to, the
initially determined primary basic frame alignment.
2.
Upon detection of the CRC-4 multiframe, the basic frame alignment associated with the CRC-4 multiframe
alignment replaces, if necessary, the initially determined basic frame alignment.
CRC-4 Multiframe Alignment Algorithm with 100 ms Timer
This CRC-4 multiframe reframe mode starts a 100 ms timer upon detection of basic frame alignment. This is a par-
allel timer to the 8 ms timer. If CRC-4 multiframe alignment cannot be achieved within the time limit of 100 ms
owing to the CRC-4 procedure not being implemented at the transmitting side, then an indication is given, and
actions are taken equivalent to those specified for loss of basic frame alignment, namely:
1.
Optional automatic transmission of A = 1 to the line while in loss of CRC-4 multiframe state.
2.
Optional automatic transmission of E = 0 to the line while in loss of CRC-4 multiframe state.
3.
Optional automatic transmission of AIS to the system while in loss of CRC-4 multiframe state.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T-7230A--ML 制造商:Rochester Electronics LLC 功能描述:- Bulk
T7230-ML3 制造商:AGERE 功能描述:
T7-231A1 功能描述:撥動開關(guān) ON NONE OFF 2 Pole Standard Bat Handle RoHS:否 制造商:OTTO 觸點形式: 開關(guān)功能: 電流額定值: 電壓額定值 AC: 電壓額定值 DC: 功率額定值: 端接類型: 安裝風(fēng)格: 端子密封: 觸點電鍍: 照明:
T7-231A2 制造商:OTTO Engineering Inc 功能描述:2POLE, SOLDER, STD,
T7-231A2D 功能描述:撥動開關(guān) ON NONE OFF 2 Pole Standard LeverLock RoHS:否 制造商:OTTO 觸點形式: 開關(guān)功能: 電流額定值: 電壓額定值 AC: 電壓額定值 DC: 功率額定值: 端接類型: 安裝風(fēng)格: 端子密封: 觸點電鍍: 照明:
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