f(n(t),t) | Power consumption in the subnet |
| Total number of ports on a router |
| Overall energy of the router |
| Gain of energy obtained during the deactivation of the ports |
| The state of ports in sub-networks at time t |
q | Quality of service perceived by the user |
| Set of all requests at the moment t |
| Observed request of a user at the instant t from a point s to a p. |
| Routing of all requests at time t (see the routing algorithm). |
| The subnet included in the network at time t |
| Quality of service set to not exceeded for all requests observed. |
| delay when ℓ(t) ports are disabled |
Delayn | Normal delay |
Maxℓ(t) | Maximum number of ports off on each router |