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ADCP-61-471 • Issue 4 • June 2000 • Section 2: Operation and Maintenance
2-258
© 2000, ADC Telecommunications, Inc.
TAD-102
Page 1 of 5
LOOPBACK PROCESS DESCRIPTION
Summary:
The HDSL loopback process is similar to other T1 intelligent repeater methods. For
Version D and later HLX modules, the HLXC loopback is like an intelligent office repeater
loopback. The HLXR loopback and HRX loopback are like an intelligent inline T1 repeater
loopback.
The HDSL loopback operation is described by the diagram in Figure 102-1. The four states are:
• Disarmed
• Armed
• Loopup
• Loopup/Time-Out Disable
7077-C
DISARMED
STATE
ARMED
STATE
LOOPUP
STATE
LOOPUP/NO TIME-OUT
STATE
ARMING
TIME-OUT
LOOPUP
TIME-OUT
LOOPUP
TIME-OUT
DISABLE
ACTIVATION
DEACTIVATION
DISARM
ARM
Figure 102-1. Loopback Operation State Diagram
Inband and ESF data link sequences and time-out operations produce the state transitions. These
sequences and time-out values are:
• Arming sequence (inband or ESF data link)
• Activation sequence
• Deactivation sequence
• Disarming sequence (inband or ESF data link)
• Loopup time-out
• Arming time-out