Operation Manual

Operations Manual
57
From the System Administration submenu enter the letters AT to access
the ATM parameters submenu:
This screen enables you to determine the values that regulate your ATM
network. The top part of the display shows the current values.
The following variables can be configured:
UNI 3.0/3.1 signalling. UNI 3.1 represents a slight modification to the
earlier UNI 3.0 specification. They vary primarily with differences in the data
link Service Specific Convergence Protocol. You must determine which
protocol is appropriate for your system by referencing your network
requirements. The default is UNI 3.0.
Sonet/SDH. Two options are available for the Fiber Optic ATM interface:
Synchronous Optical Network (SONET) STS-3c-type framing (which is more
common in North America) and Synchronous Digital Hierarchy (SDH-1)
framing (which is more common in other countries). Whichever option you
choose should remain consistent throughout the entire network. The default
is SONET.
Clocking. The options are either Internal or External. Since the clock signal
is normally supplied by the ATM switch itself. Only one switch in the UNI
connection should provide clocking. The default is External (loop).
Cells. The ATM specification requires the station to transmit null cells
during periods without traffic. This parameter determines which cells contain
Idle or Unassigned cells. The default is Unassigned cells and will be displayed
within the Frame statistics submenu.
NOTE
Parameter changes require the system to be reset before they are recognized.