Nortel Networks 8000 - Manual (Page 450)

Nortel Secure Router 8000 Series
Configuration -WAN Access 11 High-speed ATM configuration
• To configure C2, J1 or S1, run:
flag { c2 c2-value | j1 [ sonet ] jl-value | s1 sl-value }
The command configures the overhead byte i.
c2 c2-value: The signal label byte C2 belongs to the Higher-Order Path Overhead byte. You
use it to indicate the multiplexing structure of the Virtual Container (VC) and the feature of
the information payload.
j0 jO-value specifies the regenerator trace byte.
j1 jl-value specifies the path trace byte. You use it to detect whether the two interfaces are in
the continuous connection status.
s1 sl-value specifies the synchronous status byte. The di^erent values represent the quality
levels of the di^erent clock of the ITU-T. Based on the values, the device can judge the
quality of the received clock signals to determine whether switching to the clock source of the
better quality is required. The smaller the value of the S1 is, the higher the clock quality level
is.
The default value of C2 is 19 (13 in hex), and the default value of S1 is 0.
For the default values of J0 and J1:
• In the SONET mode, the default values of J0 and J1 are both 1.
• In the SDH mode, the default values of J0 and J1 are both “Nortel”.
By default, ATM interface works in the SDH mode.
For the c2 byte and the j1 byte, configure both the ends to be consistent.
—End
11.2.5 Configuring the scrambling
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:
Scramble
The scrambling is enabled.
By default, the scrambling is enabled. It is valid only for payloads and does not influence the
cell header.
The scrambling can e^ectively avoid continuous "0"s or "1"s.
—End
Issue 5.3 (30 March 2009) Nortel Networks Inc. 11-7