National-Bit - 3Com 3C13618 Command Reference Manual

3Com Router Command Reference Guide — V1.00
It is necessary to place the CE3 interface into loopback only when implementing test
on some special functions.
If encapsulating an E1 channel with PPP and placing it in loopback, it is normal that
the link layer protocol is reported as "Down".
Example
# Place E3 0 interface into local loopback.
[3Com-E3-0]loopback local

3.6.11 national-bit

Syntax
national-bit { 0 | 1 }
undo national-bit
View
CE3 interface view
Parameter
0: National bit of CE3 interface is 0.
1: National bit of CE3 interface is 1.
Description
Using the national-bit command, you can configure the national bit of CE3 interface.
Using the undo national-bit command, you can restore the default setting.
By default, the national bit of CE3 interface is 1.
The national bit of E3 interface should be set to 0 only in some special
circumstances.
For related commands, see controller e3.
Example
# Set the national bit of E3 0 interface to 0.
[3Com-E3-0]national-bit 0
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