Loopbacks; Manual Loopbacks; In-Band Loopbacks; Loopback Timeout - ADTRAN Total Access 3000 Installation And Maintenance Practice

Remote Management Module Installation and Maintenance Practice

Loopbacks

The following loopback options are supported by the RMM module.

• Manual Loopbacks

• In-Band Loopbacks

• Loopback Timeouts
Manual Loopbacks
Do not invoke a DS1 loopback if the RMM is being configured
remotely and the management link is provided by the RMM.
The RMM can be set into loopback mode manually through the SCU interface.
the loopbacks and their descriptions.
In-Band Loopbacks
When loopback detection is enabled, the DS1/WAN interface responds to unframed, in-band
CSU line loop codes sent from the network direction. The loop-up code is 1-in-5
(binary 10000) and the loop-down code is 1-in-3 (binary 100). The codes must be sent for at
least five seconds for the unit to respond.

Loopback Timeout

The RMM has a default loopback timeout of 120 minutes, but can be set to 90 minutes, 60
minutes, 30 minutes, or disabled through the SCU interface.
Loopback Options
DS1 Line loopback
DS1 Payload loopback
None
10
CAUTION

Table 6. Loopback Options

Description
Loops the DS1 port data toward the MUX/DSX-1 before it reaches the DS1
framer circuit
Loops the DS1 port data toward the MUX/DSX-1 after it reaches the DS1
framer circuit
Drops all active loopbacks and enables normal operation
Table 6 lists
61181019L1-5C