RAD Data comm ASMi-52 - Manual (Page 128)

Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual
6-24 Frequently Asked Questions ASMi-52 Ver. 2.5
To deactivate multiple loopbacks:
• From the Local or Remote Test menu, select Clear All.
The TST indicator turns off.
Running the LEDs Test
The user can perform the front-panel LED test to verify that the local unit
indicators are functioning properly.
To run the LEDs test:
1. From the Diagnostics menu (see
Figure 6-22 ), select Local Test (Main menu >
Diagnostics > Local Test) to run the LEDs test on the local ASMi-52.
The Local Test menu is displayed (see Figure 6-23 ).
2. Select LED Test.
All the front-panel LED indicators light up for two seconds.
6.6 Frequently Asked Questions
Question : In which cases is it not possible to loop the ASMi-52 modem via the
diagnostic screen?
Answer
: There are two possible reasons why the loops options do not appear in
the diagnostic screen:
1. The modem has an ETH interface, and since there are no loops in ETH, this
option does not exist.
2. When two modems are connected back-to-back and one of them is in loop
mode, the other modem cannot access the loop options.
Question : What are the different types of SHDSL mapping supported by RAD
products?
Answer
: There are 3 modes of transferring user data over SHDSL:
Serial ATM
Slotted E1
n × 64
Since SHDSL defines its own framing, the data must be "converted" to one of the
three framing types defined above. Serial ATM uses ATM features (ATM cells,
UVR, VBR, CBR, and so on); while slotted E1 defines timeslots as the timeslots
used for E1 Tx (up to 2048 kbps). Finally, n × 64 defines the data rate of the serial
port data in steps of 64 kbps, starting from 64 kbps, and ending in 4.6 Mbps.