下行方向

EPON下行方向调和子层电路设计它使得在MAC层和协调子层（RS）之下可以支持不同的介质类型。

Circuit Design of RS Sublayer in EPON downlink MII makes it possible to support different media under the MAC Control Sublayer and the Reconciliation Sublayer .

分析了多小区多用户环境下，采用Costas序列构建时间-频率映射模式的正交频分复用（OFDM）跳频系统下行方向上的性能。

The downlink performance of orthogonal frequency division multiplexing ( OFDM ) fre - ( quency ) hopping system with time-frequency mapping patterns derived from Costas sequence was analyzed in a multi-cell multi-user scenario .

WTO今天将2011年全球商品贸易增长率的估计数字，从已经相当谨慎的6.5%下调至5.8%，同时警告风险根深蒂固地保持在下行方向。

The WTO today cut its estimate for growth in global goods trade in 2011 to 5.8 per cent from an already cautious forecast of 6.5 per cent and warned that the risks were firmly rooted on the downside .

详细分析了链路预算上／下行方向的特点，并与R4链路预算进行对比，针对从R4基础上升级HSDPA和直接HSDPA给出了不同的网络估算流程。

UL / DL link budget is analyzed in detail and compared with R4 . Different network estimation flows are given based on HSDPA over R4 or direct HSDPA .

EPON是一个点对多点的拓扑结构网络，下行方向利用广播方式传输，而上行方向采用多个ONU共享传输媒质的多址接入方式。

EPON is a kind of topological structure network of one point to multi-point , the downstream utilizes broadcast way , and the upstream adopts the way that a lot of ONU share the multi-address access .

减速并观察铁路上下行方向。

Slow down and look both ways for trains .

除非经济出人意料地恢复快速增长，否则物价和工资所承受的主要压力仍必然是下行方向。

And unless rapid economic growth stages a welcome but unexpected return , the predominant direction of pressure on prices and wages will remain resolutely downwards .

报警器可以对区间线路施工现场上、下行方向1.5km以外所有来车及时进行语音报警，保证施工安全。

The warning device can give in time voice warning to all the trains coming from both up and down directions beyond 1.5 km from the construction site so that construction safety can be guaranteed .

短信的传送分上下行两个方向。

The transfer of SMS is divided into two directions , downlink and uplink .