博世 SE-C4 伺服電機(jī) 3000rpm 21nm 24v-dc

狀況：新
品牌：博世
模型：MAD100C-0200-SA-N0-AK0-05-N1SE-C4
階段：3PH
力量：14.1 千瓦
轉(zhuǎn)速：不適用3000 轉(zhuǎn)
軸外徑：不適用24毫米
扭矩：不適用28.472178817214 NM
電壓（交流）：不適用
電壓（直流）：不適用
送貨細(xì)節(jié)
發(fā)貨地：廈門
重量：45.90 磅
方面：31.00 x 15.00 x 15.0015.75 x 8.00 x 6.00

Confidentiality in OPERA1 is achieved by the use of DES[6] and 3DES[7] encryption systems. The admission control process involves three messages: an Access Frame that invites nodes to join the network, a contention Access Reply Frame that is an answer to the Access Frame and arequest to join the network and, finally, an Access Protocol Packet that basically inbs about the success or failure of the admission control process. It is, thus, a 3-wayhandshake.

The MAC layer is based on token passing controlled by the HE. The HE organizes and controls the downb data frame for all data transmission from the HE to the CPEs. It also assigns the access duration for each CPE, which allows the upb transmissions from the CPEs to the HE [2][8].

The data frame structure used in the upb and downb transmissions is illustrated in Figure 2 [8]. Each frame begins with a “token announce” (TA). The TA is broadcasted in the b over the network to inb the other stations about the upcoming transmission. The TA is followed by a number of bursts, each one addressing a specific CPE. Each burst consists of a burst header followed by several OPERA packets (basically similar to Ethernet packets). An interpacket header is inserted to separate two continuous packets or fragments of packets in a burst. The last symbol of the data frame carries a “Data Token” (DT).

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