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Getting Started
Sonet/SDH
Clocking
Cells
20
From the System Administration submenu enter the letters AT for ATM
parameters to access the following submenu:
This submenu 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:
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). The default is SONET. Whichever option
you choose should remain consistent throughout the entire network.
The options are either Internal or External. Since the clock signal is normally
supplied by the ATM switch itself, the default is External (loop). Only one
switch in the network should provide clocking.
The ATM specification requires the station to transmit null cells during
periods without traffic. This parameter determines whether these null cells
are either Idle or Unassigned. The default is Unassigned cells and will be
displayed within the Cell statistics submenu.
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