ADC SWD4573I1 Manuale Utente

The UPC policing function monitors and regulates traffic flow at the 

interface to ensure the traffic conforms to the configured traffic contract (see 

 for 

information about the traffic contract). Policing protects the network from intentional or 
unintentional changes in the traffic contract that could affect other connections. If you 
enable policing and traffic does not conform, it is deleted. Policing validates parameters 
such as VPI/VCI values, traffic rates conforming to contract. Policing can be enabled per one 
of the following: ATM port, PVC, or PVP.

When you subtend systems using DS1/DSX-1 cards, set up the 

subtending relationships using the command-line interface.

A daisy chain is a serial link (or cascaded link) of up to three systems that has one network 
uplink connection and is viewed as one integrated system. A daisy chain is an approach for 
managing systems to support subscribers who are physically separated by distance. The daisy 
chain comprises:

one system functioning on the edge of the network to aggregate and switch ATM 
transmissions and provide the network uplink 

up to two systems functioning as access devices

Each system, whether subtending or subtended, can connect to and manage subscriber traffic 
(modems).

 shows how to set up the daisy chain using 

Avidia systems. 

, shows how to configure the system 

to implement the appropriate connections.

The relationship of subtending in a daisy chain configuration is shown in the following figure. 
Use two cards per system to connect a daisy chain. One card, used as a line-side interface, 
connects to the next system upstream in the chain. Upstream connects toward the network 
interface. The second card, used as a channel-side interface, connects to the next system 
downstream in the chain. Downstream connects further from the network interface.

The example shows an OC3 interface as the network uplink for the entire subtended system. An 
AV8000 or AV3000 is the subtending system. The two chassis are subtended and are at two 
separate physical locations (sites). The subtending connection is through a DS3 link.