RADISYS EPC-5 EPC5數(shù)字量輸入卡件

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中文資料：

RADISYS EPC-5 EPC5能夠在冗余傳輸模式下運行。當(dāng)跳線E5的引腳1和2移除分流器時，板被配置為冗余模式。在冗余傳輸模式下，無論動態(tài)數(shù)據(jù)包大小如何，每個數(shù)據(jù)包都將傳輸兩次。接收節(jié)點評估每個冗余傳輸。如果在第一次傳輸中沒有檢測到錯誤，則使用它來更新板載存儲器，并且丟棄第二次傳輸。然而，如果第一次傳輸確實包含錯誤，則第二次傳輸用于更新板載存儲器，前提是它沒有傳輸錯誤。RADISYS EPC-5 EPC5

如果在兩次傳輸中都檢測到錯誤，則不會使用傳輸，并且數(shù)據(jù)將完全從網(wǎng)絡(luò)中刪除。RADISYS EPC-5 EPC5如果在任一傳輸中檢測到錯誤，將設(shè)置壞數(shù)據(jù)位（LCSR的位01）。

冗余傳輸模式大大減少了從網(wǎng)絡(luò)中丟棄任何數(shù)據(jù)的機(jī)會。然而，冗余傳輸模式也降低了有效的網(wǎng)絡(luò)傳輸速率。單個L字（4字節(jié)）傳輸速率從43Mbyte/sec的非冗余速率下降。至大約20兆字節(jié)/秒。16L字（64字節(jié)）的傳輸速率從174Mbyte/sec的非冗余速率下降。到87兆字節(jié)/秒的冗余率RADISYS EPC-5 EPC5

英文資料：

The RADISYS EPC-5 EPC5 is capable of operating in a Redundant Transfer mode. The board is configured for redundant mode when pins 1 and 2 of jumper E5 has the shunt removed. While in the redundant transfer mode, each packet will be transferred twice, regardless of the dynamic packet size. The receiving node evaluates each of the redundant transfers. If no errors are detected in the first transfer, it is used to update the on-board memory and the second transfer is discarded. If however the first transfer does contain an error, the second transfer is used to update the on-board memory provided it has no transmission errors.RADISYS EPC-5 EPC5

If errors are detected in both transfers, the transfers will not be used and the data is completely removed from the network. RADISYS EPC-5 EPC5The Bad Data bit (Bit 01 of the LCSR) will be set if an error is detected in either transfer.

Redundant transfer mode greatly reduces the chance that any data is dropped from the network. However, the redundant transfer mode also reduces the effective network transfer rates. The single Lword (4 byte) transfer rate drops from the non-redundant rate of 43 Mbyte/sec. to approximately 20 Mbytes/sec. The 16 Lword (64 byte) transfer rate drops from the non-redundant rate of 174 Mbyte/sec. to the redundant rate of 87 Mbyte/secRADISYS EPC-5 EPC5

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