Nortel Networks 8000 - Manual (Page 449)

11 High-speed ATM configuration
Nortel Secure Router 8000 Series
Configuration -WAN Access
• Slave mode indicates that the interface uses the line clock signals.
When you use the ATM interface as a DTE device, use the slave clock mode. When you use
the ATM interface as a DCE device, use the master clock mode.
When you directly connect the ATM interfaces of two routers 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 you connect the router to the SDH/SONET device, use the slave clock mode.
—End
11.2.3 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
The ATM interface view appears.
Step 3 Run:
frame-format { sdh | sonet }
The command configures the frame format.
ATM interface uses SDH frame format when the optical interface isSTM-1. The ATM
interface uses SONET frame format when the interface is OC-3. By default, SDH frame
format is used.
—End
11.2.4 Configuring the overhead byte
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 To configure the overhead bytes of the ATM interface, perform the following as required:
• To configure J0, run:
flag j0 { sdh | sonet } jO-value
11-6 Nortel Networks Inc. Issue 5.3 (30 March 2009)