Archive

Tunable DWDM-XFP-C Tuning by Wavelength in Cisco

To set the wavelength on a DWDM controller to a specific ITU channel or to define a specific frequency or wavelength to a DWDM controller, use the wavelength command in DWDM configuration mode. To return the wavelength to its default value, use the no form...

23 February, 2018

The configuation of Tunable XFP in Cisco 7600

A. When interface is in shutdown mode (when the switch is starting up):   [highlight color='#464646' background_color='#d5d5d5']B. Router # enable [/highlight] [highlight color='#464646' background_color='#d5d5d5']C. Router # configure terminal[/highlight] [highlight color='#464646' background_color='#d5d5d5']D. Router(config)# interface TenGigabitEthernet 4/0/0[/highlight] [highlight color='#464646' background_color='#d5d5d5']E. Router(config-if)#itu channel 28[/highlight] [highlight color='#464646' background_color='#d5d5d5']F. Router(config-if)#no shutdown[/highlight] [highlight color='#464646' background_color='#d5d5d5']G. Router#end[/highlight] B. When interface...

23 February, 2018

Why 120km Gigabit SFP has lower TX power as 80km SFP?

Question: Many customers have asked why 120km Gigabit SFP has the same or even lower transmit power as compared to 80km SFP? Shouldn't it be vice versa? Answer: The explanation is simple. 120km modules extend the range thanks to receiver not transmitter. 120km modules have much better...

23 February, 2018

The Basics: Optical attenuators

An optical attenuator is a passive device that is used to reduce the power level of an optical signal. The attenuator circuit will allow a known source of power to be reduced by a predetermined factor, which is usually expressed as decibels. Optical attenuators are...

23 February, 2018