由买买提看人间百态

topics

全部话题 - 话题: uplink
1 2 3 4 下页 末页 (共4页)
p*******m
发帖数: 20761
1
Ranker Performance Summary
NETGEAR R7000
Nighthawk AC1900 Smart WiFi Router
Test Notes:
Test client: ASUS PCE-AC66U (Win 7 6.30.95.26 driver) for 2.4 & 5 GHz tests
Read product review
Rankings shown are out of 5 AC1900 products tested
# 1 for Total router (1.5)
# 1 for Routing Throughput (0.5)
#1 for Total Simultaneous Throughput [1378.31 Mbps]
#1 for Max simultaneous connections [38793 connections]
# 2 for Average Wireless Throughput (1.8)
#1 for 2.4 GHz Downlink Throughput Avg. [91.325 Mbps]
#... 阅读全帖
s*******s
发帖数: 1250
2
来自主题: Hardware版 - 家庭网络连接如何增加接口?
The switch should have an uplink port. Make sure you plug the router into
that.
If the switch does not have an uplink port, most do though, you will need a
crossover cable to connect.
Some switches have a port that can be switched from a standard port to an
uplink port. Make sure its switched to uplink. Some switches will auto
detect what is plugged into it, either a computer or another network device
like a router and adjust themselves automatically.
m**a
发帖数: 1840
3
【 以下文字转载自 EE 讨论区 】
发信人: mola (Super Baby), 信区: EE
标 题: 为极解密:如何看待华为拿下5G“短码”方案?
发信站: BBS 未名空间站 (Thu Dec 8 12:21:31 2016, 美东)
朋友大作,发在知乎。欢迎点赞和转发。
https://www.zhihu.com/question/52732376
美国当地时间11月17日凌晨0点45分,在刚刚结束的3GPP RAN1 87次会议的5G信道编码
方案讨论中,经过艰苦卓绝的努力和万分残酷的竞争,以中国华为公司主推的Polar
Code(极化码)方案,成为5G控制信道eMBB场景编码方案。
编者按
“华为极化码事件”内幕:
极化码获得的并非之前大肆炒作的“短码”。
极化码打败的对手并不是LDPC,而是在控制信道上取代4G现有技术TBCC。
若非极化码最终靠非技术手腕挤进控制信道,华为投资几十亿的5G“三神器”在5G NR
第一阶段业已全部打水漂。
整个5G信道编码又经历一番怎样波澜壮阔的争斗,这背后又隐藏着多少暗流汹涌的阴谋
诡计。“为极解密” 为您最全方位的解析。
为极解... 阅读全帖
y***k
发帖数: 162
4
来自主题: JobHunting版 - 长年潜水,回馈FLG面经
具体要求是给我一个initial的url,要从该url出发,把所有能到达的web page下载下
来,而且要保证每个page只被下载一次。然后assume每个机器的downlink带宽比uplink
带宽高很多。
High level的架构就是用一个hash function urlToMachine把各个url map到各台机器
上。从initial url开始,将其map到一台机器上。该台机器下载对应的page,并从下载
到的page里提取出新的url。最后把提取出的新url按照urlToMachine发给对应的机器。
如此循环扩散。
每台机器上的module及功能:
1. key-value store:用来保存该机器见过/下载过的url及其对应的page content。
2. communication module:负责接收从其他机器发送来的url,和将从本地的page
process module传来的url发送给其他机器(也可以传给自己,如果url对应的机器就是
自己的话)。对于每个从接收到的url,首先从key-value store里check是否第一次见
到。如Y... 阅读全帖
F***Q
发帖数: 6599
5
来自主题: Living版 - 推荐一个comcast 的modem吧, xiexie

this one had worked for me for many years:
https://www.google.com/search?q=Linksys+cm100
early this year, I upgraded the uplink speed from 25mbps to 35mbps, I had to
get a DOCSIS 3.0 modem, I bought DCM3008, it has been working smoothly
since, the uplink speed can go up to 65 mbps
https://www.google.com/search?q=Linksys+cm100&oq=Linksys&aqs=chrome.1.
69i57j69i59l2j0j69i60j69i61.1488j0&sourceid=chrome&ie=UTF-8#q=linksys+docsis
+3+DPC3008&safe=off&tbm=shop
get a separate router, you need more por... 阅读全帖
T**G
发帖数: 367
6
楼主的顾虑我理解了。
It is common practice to use the internet uplink from the sunday newspaper
as one of the three additional
recruitment steps, it's typically a free service offered by the newspaper
when you advertise in print. Two
things you may want to pay attention to:
1. It typically gets linked to a big online job site, i.e., yahoo hotjobs,
that has a lot of internet traffic, hence,
more applicants.
2. You may want to remind the newspaper to remove the online link after
certain number of days. Diff... 阅读全帖
m**a
发帖数: 1840
7
【 以下文字转载自 EE 讨论区 】
发信人: mola (Super Baby), 信区: EE
标 题: 为极解密:如何看待华为拿下5G“短码”方案?
发信站: BBS 未名空间站 (Thu Dec 8 12:21:31 2016, 美东)
朋友大作,发在知乎。欢迎点赞和转发。
https://www.zhihu.com/question/52732376
美国当地时间11月17日凌晨0点45分,在刚刚结束的3GPP RAN1 87次会议的5G信道编码
方案讨论中,经过艰苦卓绝的努力和万分残酷的竞争,以中国华为公司主推的Polar
Code(极化码)方案,成为5G控制信道eMBB场景编码方案。
编者按
“华为极化码事件”内幕:
极化码获得的并非之前大肆炒作的“短码”。
极化码打败的对手并不是LDPC,而是在控制信道上取代4G现有技术TBCC。
若非极化码最终靠非技术手腕挤进控制信道,华为投资几十亿的5G“三神器”在5G NR
第一阶段业已全部打水漂。
整个5G信道编码又经历一番怎样波澜壮阔的争斗,这背后又隐藏着多少暗流汹涌的阴谋
诡计。“为极解密” 为您最全方位的解析。
为极解... 阅读全帖
k**0
发帖数: 19737
8
The specific frequency bands originally defined by the UMTS standard are 1885–2025 MHz for the mobile-to-base (uplink) and 2110–2200 MHz for the base-to-mobile (downlink). In the US, 1710–1755 MHz and 2110–2155 MHz will be used instead, as the 1900 MHz band was already utilized.[6] While UMTS2100 is the most widely-deployed UMTS band, some countries' UMTS operators use the 850 MHz and/or 1900 MHz bands (independently, meaning uplink and downlink are within the same band), notably in the US by AT
l**n
发帖数: 7272
9
my 2 cents
At the system level, the uplink and downlink are asymmetric in terms of data
rate at the air interface level. It is in that many applications need high
speed downlink and do not require very fast uplink. In this sense, the
power constraint for 4G at the mobile stations may not be that stringent.
Consequently, I disagree with cocoon who brought in the Shannon limit as a
fact for "4G" is impractical.
On the other hand, I feel that the following items may play much bigger role
than air... 阅读全帖
l****h
发帖数: 28
10
http://cellularinsights.com/iphone7/
iPhone 7 Plus: A Tale of Two Personalities
Like clockwork, every September the entire tech world gets excited for the
newest Apple device. The combination of a premium build, unmatched system
performance, and tightly integrated software and services delivers what’s
considered to be the gold standard in smartphone user experience.
Over the past five years, Apple’s modem supplier was Qualcomm, but this
year, Apple has taken a different approach with the decisio... 阅读全帖
g***p
发帖数: 139
11
来自主题: EmergingNetworking版 - 请教一个switch的问题
netgear的nonmanage switch,用什么办法才能知道它的uplink mac address?
先用switch连router,想从router里看client mac,没用。google了一下午了。
能不能用manageable switch看client list里是否有uplink mac?谢谢帮忙
s*****g
发帖数: 1055
12
来自主题: EmergingNetworking版 - 看起来北美的同学们还是这么看重CCIE, 唉
Why would any body care how a box internally works? and what is the
difference between a switch and routers nowadays?
Difference between 7600 WAN ethernet and LAN ethernet not just buffer and
QoS, internally packet forwarding path is different also. WAN ethernet was designed to have MPLS forwarding capability before
Sup720 came out, while LAN ethernet has to rely on PFC to switch MPLS
packets with PFC3BXL and newer versions of PFC, LAN ethernet can not be used
for VPLS uplink. All other AToM fe... 阅读全帖
z**r
发帖数: 17771
13
来自主题: EmergingNetworking版 - 看起来北美的同学们还是这么看重CCIE, 唉
6500/7600用LAN卡也可以做ATOM,但是IMPOSITION/DISPOSTION需要pfc来做,也就是如
果做最普通的EOMPLS(MAIN INTERFACE BASED),那么这些个LAN卡也可以做UPLINK,但
是其他的比如SCALABLE EOMPLS这些,就做不了了,必须得用WAN卡来做UPLINK,有些
FEATURE甚至要求CE FACING LINECARD也是WAN卡。
这就是用LAN卡和WAN卡的本质区别
x*********n
发帖数: 28013
14
好吧,我什么都不懂。
你怎么想的,无所谓,反正知识是你自己的,器材你想怎么接也无所谓,SFP是啥,
RJ45,100M,200M,1G都可以,谁来在乎你怎么错啊。
设备你看cisco。com就会发现了,2960是access layer的,3745是之类的是
distribution layer,6500之类的是core layer。
access port是接workstation,uplink是接switch,uplink之所以要大一点,是因为
data都要从这里过。
BTW,以后你的帖我就不回了,省的你生气。说实话我也有点生气,自己的说的被人无
视了,呵呵。
BTW,芝加哥的fanacial company都是直接杀鸡用牛刀的,整幢楼用的是一个型号的
switch,据说,为了以后容易搬家,train员工方便。便于管理。。哈哈哈。。财大气
粗没办法啊。
p**i
发帖数: 688
15
Please be aware slow speed is most likely result of your uplink bandwidth
since it typically is < 50KB/s for cable/DSL. If you have an active
uploading
task running without any limits, it will exhaust your uplink bandwidth for
sure.
t**x
发帖数: 20965
16
来自主题: Hardware版 - 家庭网络连接如何增加接口?
谢谢提醒,没有想到这个uplink port的问题。
我的型号是 d-link dgs-1024D, 似乎没有这个uplink port, 看来得用一根crossover
cable 了。还是得用很多根。。。 想不通。
p*******m
发帖数: 20761
17
来自主题: Hardware版 - 家庭网络正确姿势3路由网
Steve Gibson's Three Router Solution to IOT Insecurity
Author: Nicolae Crisan
Date: August 15, 2016
Subject: General Tech
Manufacturer: Various
Tagged: networking, network, iot
Introduction
Even before the formulation of the term "Internet of things", Steve Gibson
proposed home networking topology changes designed to deal with this new
looming security threat. Unfortunately, little or no thought is given to the
security aspects of the devices in this rapidly growing market.
One of Steve's propos... 阅读全帖
t***o
发帖数: 4265
18
实际的Mobile communication 里,一般要用到功率控制。由于读的paper中,只讲算法
。我很想知道实际的电路是怎样实现的。我想,在发射器(uplink or downlink)中应该
有个功率放大器吧。这个放大器是调整输出电流还是电压?
我现在有一个data logger,用GPRS传送数据。我可以控制电源输出电压并保持恒定,
我发现在不同的电源电压下,logger消耗的电流好像没有多大变化。我原来设想当电压
降低时,电流应该增大。但当我增加通信信道衰减时(电源电压保持不变),我看到电
流增大了。
还有,在实际的GSM uplink中,base station 的目标Received BER 或 Received
Level 是多少?mobile的信号强度浮动的范围是多少?
W*****e
发帖数: 7759
19
uplink is different now: LTE: SC-FDMA, WiMAX: OFDMA,
However, WiMAX may change its mulitple access technique for uplink...
h**0
发帖数: 37
20
1. 理论上user2是能偷听到user1的transmission(uplink上的信息),
这是因为BS事先将ul_map广播给全部SS, 所以,user2完全有能力知道user1在
uplink的什么时隙和用什么调整方式, 所以,user2完全能解调出user1发个BS的信息。
实际现实中, 没有哪个商用芯片会这么干,因为不符合规范,而且MAC处理程序会多
出一块,何必呢。 大概只有为开发调试才会这么干 。
2. 按你的假设,user1的信号到达BS和user2所在位置,信号质量是一样的。
一般情况下,BS的BER会小点。
可能的原因: BS的天线更好(这个是主要因素); BS的芯片更好的
g****t
发帖数: 31659
21
http://blogs.adventnet.com/svembu/2005/12/30/two-philosophies-in-cdma-a-stroll-down-memory-lane/
I have now worked a little over 10 years in the industry, after getting my
PhD. In my very first year of work at Qualcomm, I noticed how even when
speaking about the same subject, namely CDMA, academia and industry were on
totally different planets. When I was in Qualcomm, I co-authored a paper
with Dr. Viterbi, titled Two Different Philosophies in CDMA, A Comparison. I
still stand by the conclusions... 阅读全帖
m**a
发帖数: 1840
22
朋友大作,发在知乎。欢迎点赞和转发。
https://www.zhihu.com/question/52732376
美国当地时间11月17日凌晨0点45分,在刚刚结束的3GPP RAN1 87次会议的5G信道编码
方案讨论中,经过艰苦卓绝的努力和万分残酷的竞争,以中国华为公司主推的Polar
Code(极化码)方案,成为5G控制信道eMBB场景编码方案。
编者按
“华为极化码事件”内幕:
极化码获得的并非之前大肆炒作的“短码”。
极化码打败的对手并不是LDPC,而是在控制信道上取代4G现有技术TBCC。
若非极化码最终靠非技术手腕挤进控制信道,华为投资几十亿的5G“三神器”在5G NR
第一阶段业已全部打水漂。
整个5G信道编码又经历一番怎样波澜壮阔的争斗,这背后又隐藏着多少暗流汹涌的阴谋
诡计。“为极解密” 为您最全方位的解析。
为极解密
作者:见南山
第一章 极之澄清
第一章 第一节 5G到底哪一部分码会考虑使用极化码?
第一章 第二节 极化码在长码上真的是几票惜败于LDPC么?
第一章 第三节 5G NR 极化码到底打败了谁?
第二章 极化之源
第二章 第一节 前5G -- 毫... 阅读全帖
d*******o
发帖数: 5897
23
用的R850,信号一格,怎么上传这么低??
w********e
发帖数: 297
24
换band试试
d*******o
发帖数: 5897
25
怎么换?在管理界面没发现有选项啊?
w********e
发帖数: 297
d*******o
发帖数: 5897
27
多谢!
l***h
发帖数: 9308
28
这个dd-wrt带宽监控里面,有3个实时动态图
Bandwidth Monitoring - LAN
Bandwidth Monitoring - WAN
Bandwidth Monitoring - Wirelss
分别代表什么?LAN是否是路由器后面的有线连接的4个口,唯一连接的HTPC关了,但还
有10-20Kbps持续的连接。
最后的Wireless,好像反映的是跟该从路由器跟主路由器之间的流量,下载(In?)基本
上能保持在我设定的downlink 2M,但上载(Out?)超过了我设置的uplink 0.2M限制,
经常性的达到ISP给的高限0.5M。感觉QoS对uplink没起作用(downlink还是有限制作用)
p***r
发帖数: 4702
29
来自主题: Military版 - 仰望苹果,脚踏实地。 (转载)
别的还行,说3G uplink 不够根本是放屁,我在N97上用fring视频清晰得不得了
w*******r
发帖数: 7276
30
Nearly all C-band communication satellites use the band of frequencies from
3.7 to 4.2 GHz for their downlinks, and the band of frequencies from 5.925
GHz to 6.425 GHz for their uplinks. Note that by using the band from 3.7 to
4.0 GHz, this C-band overlaps somewhat into the IEEE S-band for radars.
Ku band is 11.2 GHz to 14.5 GHz.
According to what you said, anything higher then 3.4G will not pass through
atmosphere. Then all the current Geo satellite will be useless because they
all use C and K... 阅读全帖
d*********o
发帖数: 6388
31
来自主题: Military版 - 玉兔第三次醒来
https://twitter.com/search?q=UHF_Satcom&src=typd
UHF Satcom ‏@uhf_satcom 2h
China's Yutu rover seems to be back in full chat mode: http://pjm.uhf-satcom.com/twtr/yutu_8462072b_130314.jpg … good signals now, signal levels returned to pre-sleep ones.
UHF Satcom ‏@uhf_satcom 3h
And, China is in comms with Yutu, it is now back on 8462.072MHz with data,
and uplink EME is being detected on 7202.377MHz - a huge signal!
S*********e
发帖数: 4
32
上个月还20Mbps,今天发现40多了

发帖数: 1
33
真鸡巴落后
S*********e
发帖数: 4
34
我擦,你说说你是啥牛逼的服务?麻痹的

发帖数: 1
35
光纤入户啊,上行下行一个速度

:我擦,你说说你是啥牛逼的服务?麻痹的
S*********e
发帖数: 4
36
那也有gigabytes和一般的区分。再说google fiber和Verizon 不是每个城市都有。吹
什么牛逼

发帖数: 1
37
所以说你在落后地区嘛

:那也有gigabytes和一般的区分。再说google fiber和Verizon 不是每个城市都有。吹
:什么牛逼
S*********e
发帖数: 4
38
尼玛土鳖。google fiber恰恰是从落后地区开始服务的

。吹

发帖数: 1
39
Google fiber早嗝屁了

:尼玛土鳖。google fiber恰恰是从落后地区开始服务的
B*D
发帖数: 5016
40
不过鳖能搞定越南的SAM系统?
是用诱饵让雷达开机,然后反辐射干
还是说干扰吊舱对uplink之类的信号已经吃定了?
1 2 3 4 下页 末页 (共4页)