The Ku-band Network

Nara Institute of Science and Technology

AI3 Nara NOC Team

UMEDA Toshiyuki

The state of Nara NOC

Aug 15-16, All equipment to the new room Cold Dry and Clean room All router and modem have few troubles

The new cables are introduced. The receiving signal power is higher than before

The measurement of the receiving signal power

The signal power from ITB, AIT and NAIST (9/1 - 9/30)

From NAIST is a return signal power We measured the network unavailable time.

The C/N of the receiving power is under 6dB

The receive signal power

ITB 761min is under 6dB(C/N) 98.24% is available

AIT 250min is under 6dB(C/N) 99.41% is available

The receive signal power (2)

NAIST 54.5min is under 6dB(C/N) 99.87% is available

The signal power chart

The problems

ITB The receiving signal power is variable

AIT The receiving signal power is very variable The receiving signal power is a little low

How to solve the problems

Please ask Mr. Mizuno

1 1:13:30 - 1 8:00:00 (406.5min) 1 12:41:00 - 1 12:48:00 (7min) 1 13:05:30 - 1 13:12:00 (6.5min) 20 9:43:00 - 20 10:39:30 (56.5min) 20 17:14:00 - 20 17:40:00 (26.5min) 20 19:27:30 - 20 19:28:00 (0.5min) 22 15:27:30 - 15:35:30 (8min) ２３ １７ : ４７ : ００ 17: ４８ : ３０ 1min30sec ２４ ０６ : ０５ : ３０ 06: ０６ : ００ 30sec ２４ １４ : １８ : ３０ １５ : １６ : ００ 57min30sec ２４ １６ : ０９ : ３０ 16: １４ : ３０ 5min ２５ １３ : ２１ : ００ １６ : ０４ : ３０ 163min30sec ２９ １９ : ２２ : ００ 19: ４３ : ３０ 21min30sec