Internet quality of service between the UK and La Palma in 1998 and 1999

被引：4

作者：

McNerney, P ^{[1
]}

Steele, IA ^{[1
]}

机构：

[1] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool CH41 1LD, Merseyside, England

来源：

ADVANCED GLOBAL COMMUNICATIONS TECHNOLOGIES FOR ASTRONOMY | 2000年 / 4011卷

关键词：

Internet; Quality of Service; La Palma; robotic telescopes;

D O I：

10.1117/12.387227

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The Liverpool telescope on La Palma will provide live images for planetarium shows in the Liverpool Museum in the UK. Data transfer will be achieved using the Internet. We implemented an automatic programme of hourly ftp file transfers from La Palma to the UK throughout 1998 and 1999 to monitor the transfer rates achievable. We find that both the mean and minimum (on 9 out of 10 nights) transfer rates are a function of time of day on weekdays. In addition we find that the minimum transfer rate in early evening has increased from similar to 5 Kbytes/sec in 1998 to similar to 25 Kbytes/sec in 1999. This implies that a compression ratio of around 30:1 must be achieved to allow live display of 2048x2048 pixel CCD images in the UK within 10 seconds of the data being taken.

引用

页码：23 / 32

页数：10