Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 325)

Testing CSU
Access Manager 2000 User Manual 8-55
These signals are either framed or unframed, depending on how you
configured the NCC or TAC in the Enable Testing Options screen
when you configured the CSU. Furthermore, how you configured
the NCC or TAC determines whether these inband test signals are
permitted at all.
• 1-in-8 ONEs: A stress pattern with a single pulse in every 8-bit
sequence. This signal checks a circuit’s ability to function under
low-density conditions.
• 3-in-24 ONEs: A stress pattern containing three pulses in every
24-bit sequence. It tests the ability of a circuit to function under
extremely low-density conditions.
• Quasi-random Signal (QRSS): A 2
20
- 1 randomized bit
sequence modified according to AT&T TR-54016. This signal
exercises the circuit with a varying pattern of ONEs and ZEROs.
If the QRSS is applied unframed, it is limited to 14 consecutive
ZEROs. If applied framed, it is limited to 15 consecutive
ZEROs.
• ALL-ONEs: A keep-alive signal sent in the desired direction.
Whichever test signal is chosen, if it is sent toward the net, then the
equipment receives an AIS (All-ONEs) signal.
5. After selecting a test operation, the CSU Test Options screen
appears.
Enter the Test Duration (i.e., the period of time for which to
apply the test signal). This can be done in one of the following
ways:
• A specific time interval in xx SEC , xx MIN , xx HR (up to
24), or FOREVER .
• To apply the test signal toward the network, type N .