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Disarmed State
The normal operation mode is the disarmed state. Although each HDSL unit is transparent to the data flow, each monitors the inband data flow and the ESF data link for the arming sequence. The CPE smartjack loopup inband control code sequence arms the loopback capability of all HDSL units at the same time. Each HDSL unit arms when the arm sequence code has been received for five seconds.
The HDSL unit detects the unit arming and smartjack loopup sequence without disturbing the detection by the smartjack (the smartjack loopup response needs a minimum of five seconds). The arming sequence requires that the smartjack does the loopup and all HDSL units go from the disarmed state into the armed state. No other control code sequences are detected while in the disarmed state.
The ESF data link sequence that arms the loopback capability of all HDSL units at the same time is the standard
Note: If the HLXR is provisioned as
In the same manner as described above for the inband code, the HDSL unit detects the unit arming and smartjack loopup sequence without disturbing the detection by the smartjack. For example, the ESF arm sequence causes the smartjack to loopup and all HDSL units move from the disarmed state into the armed state. No other ESF data link control code sequences are detected in the disarmed state.
Note: If the HLXR is provisioned as
Armed State
The HDSL unit continues to be transparent to data flow in the armed state. However, the units monitor the inband data flow for activation and disarming sequences and the ESF data link for the disarming sequence.
Note: The ESF data link does not directly command a loopup of the HDSL units.
A unit returns to the disarmed state after an arming
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