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)： 34/110頁
文件大?。?/td> 752K
代理商： T7230A
Preliminary Data Sheet
T7230A Primary Access Framer/Controller
June 1997
30
Lucent Technologies Inc.
Frame Formats
(continued)
T1 Framing Structures
(continued)
The T7230A monitors the CRC-6 errors and tracks the performance categories defined in the AT&T Technical Ref-
erence 54016:
1.
2.
3.
4.
Errored events: any loss of frame alignment or CRC-6 errored checksum
Errored seconds: a 1 second period with a loss of frame event
Bursty errored seconds: a 1 second interval with more than 2 but less than 320 CRC-6 errors
Severely errored seconds: a 1 second interval with a loss of frame event, or 320 or more CRC-6 errors, or eight
or more framing bit errors (SF format)
The T7230A maintains counters for each of these categories that can be accessed through the microprocessor
interface.
The ESF remote frame alarm consists of a repeated pattern of eight 0s followed by eight 1s transmitted to the line
interface in the data link position of the framing bits transmit frames.
T1 Loss of Frame Alignment (LFA)
Loss of frame alignment condition for the frame, superframe, or the extended superframe formats is caused by the
inability of the receive framer to maintain the proper sequence of frame bits. The number of errored framing bits
required to detect a loss of frame alignment is given in Table 14.
The T7230A indicates the loss of frame and superframe states by setting the LFA (red alarm) and LSFA bits,
respectively, in the status registers for the duration of the states. Once set, the local system may give an indication
of its local LFA state to the remote end by transmitting a remote frame alarm (RFA or yellow alarm). In addition,
while in the LFA state, the local end may transmit the alarm indication signal (AIS or blue alarm) to its system inter-
face.
Table 14. T1 Loss of Frame Alignment Criteria
Format
Number of errored framing bits that will cause a loss of frame alignment state.
2 errored frame bits (F
T
or F
S
) out of 4 consecutive frame bits.
2 errored frame bits (F
T
or F
S
) out of 6 consecutive frame bits.
2 errored F
S
bits out of 4 consecutive F
S
bits.
2 errored frame bits (F
T
or F
S
) out of 4 consecutive frame bits.
2 errored F
S
bits out of 4 consecutive F
S
bits.
4 errored frame bits (F
T
or F
S
) out of 12 consecutive frame bits.
2 errored F
E
bits out of 4 consecutive F
E
bits.
2 errored F
E
bits out of 6 consecutive F
E
bits.
D4: Frame (AT&T)
D4: Frame (ANSI)
D4: SF
SLC-96: Frame
SLC-96: SF
DDS: Frame
ESF: (AT&T)
ESF: (ANSI)
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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:
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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: 安裝風格: 端子密封: 觸點電鍍: 照明:
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