Nortel Networks 8000 - Manual (Page 396)

10 Low-speed ATM configuration
Nortel Secure Router 8000 Series
Configuration -WAN Access
10.2.2 Configuring the parameters of ATM OC-3/STM-1 interfaces
Configuring the clock mode
Do as follows on the routers:
Step 1 Run:
system-view
The system view appears.
Step 2 Run:
interface atm interface-number
The ATM interface view appears.
Step 3 Run:
clock { master | slave }
The command configures the clock mode.
By default, the clock modes of ATM OC-3/STM-1 are slave.
• Master mode indicates that the interface uses the internal clock signals.
• Slave mode indicates that the interface uses the line clock signals.
When the ATM interface is used as a DTE device, use the slave clock mode. When the ATM
interface is used as a DCE device, use the master clock mode.
CQ NOTE
According to different functions, you can divide ATM devices and interfaces into the following two
types:
• The user device is called Data Terminal Equipment (DTE). The interfaces on the DTE are called
DTE interfaces.
• The device that provides access for DTE is called Data Circuit-terminating Equipment (DCE),
belonging to the network device. The interfaces on the DCE devices are called DCE interfaces.
When the ATM interfaces of two routers are directly connected by optical fiber or Wavelength
Division Multiplexing (WDM) devices, do the following. Configure one port to use the
master clock mode, and the other port to use the slave clock mode.
When the router is connected to the SDH/SONET device, use the slave clock mode.
—End
Configuring the frame format
Do as follows on the routers:
Step 1 Run:
system-view
The system view appears.
Step 2 Run:
interface atm interface-number
10-10 Nortel Networks Inc. Issue 5.3 (30 March 2009)