ADC SWD4573I1 Manuale Utente

When a new VC or VP is created, CAC compares the requested QoS with resources available 
for both upstream and downstream traffic. If the requested QoS is available for both directions, 
the connection is established.

If the requested QoS is not available, CAC denies the connection request and generates an 
error message.

When CAC establishes a connection, it also creates queues for the connection. These queues 
operate on a per-VC and per-QoS basis, independently maintaining the guaranteed QoS for each 
established connection.

When setting up a connection, policing functions for the connection can be enabled or disabled. 
If enabled, policing allows UPC functions to monitor traffic flow and discard non-conforming 
cells.

Two types of addresses are used to identify ATM devices:

ATM addresses are public addresses assigned by a regulatory body.

Location IDs are private addresses that identify ATM devices within a network.

Each ATM address is unique to the individual device to which it is assigned, which provides 
access to all other connected ATM devices. All ATM addresses are 20 bytes long, and are 
composed of two parts:

The prefix contains network and other information that identifies the location of the device. 
All devices on a chassis use the same prefix. The prefix can be any length, up to 19 bytes. 
The length may be defined by the regulatory body that assigned the address. For example, 
all E.164 addresses have an 8-byte prefix. 

The system identifier identifies the specific device on the network. Its length is the 
difference between 20 bytes and the prefix length.

Location IDs are assigned by an ISP or other local body. They are unique within a location ATM 
network but are not necessarily unique globally. Location IDs can be any length up to 20 bytes. 

When configuring OAM loopbacks you must enter a location ID. It is recommended that you 
use system's network prefix followed by 0s for the Location ID.