Table C3-30. Arguments For The T1_Loopback Command; T1_Loopback - Bay Networks 5390 Administering

Communications server

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In superuser CLI mode, the superuser su command returns you to user CLI mode and requires no

The superuser t1_loopback command places the T1 engine into loopback mode. None of the

loopback conditions persist through a power down or reboot. A major consideration to those using

the T1 service must be made before using this command since it will completely disrupt the T1

The syntax for the t1_loopback command is:

t1_loopback [ none | line | payload | local ]

Table C3-30 describes the arguments for t1_loopback.

NOTE: If the Model 5390 server is conﬁgured with an IP address, the

default administrative (su) password is the IP address in dotted-deci-

mal notation. If the Model 5390 server is not yet conﬁgured with an IP

address and the administrative password has not been modiﬁed (via the

Model 5390 password parameter or via the CLI passwd command), the

password is a null string ("") . If the Model 5390 server is not conﬁgured

with an IP address and boots via MOP, IPX, or from FLASH ROM, the

default password is a null string ("") and entering a carriage return at

the Password prompt places you in superuser mode.

Table C3-30. Arguments for the T1_Loopback Command

No loopback. This is the default. If the t1_loopback

command is initiated with no parameters, then none

is assumed. It cancels any user-speciﬁed loopbacks.

Line loopback provides the network a means to test

the T1 circuit for single-ended fault isolation. The

line loopback regenerates the DS1 signal and does

not correct bipolar violations.

Using the CLI Commands