Verilink QUAD DATA (880-503319-001) Product Manual - Manual (Page 37)

Diagnostics
Verilink QUAD DATA User Manual 4-3
Diagnostics
Commands
The lower portion of the QUAD DATA Diagnostics Menu presents
command options used to control loopbacks and tests. These
options are detailed in
Table 4-2 .
Table 4-2 QUAD DATA Diagnostics Commands
LL Indicates the status of the interface lead Local
Loopback (not applicable to X.21 ports). This
is an indicator in DCE mode, or an output
which can be forced on in DTE mode.
The DTE can use LL to establish a
Local Loopback in the DCE.
RL Indicates the state of the interface lead
Remote Loopback (not applicable to X.21
ports). This is an indicator in DCE mode, or
an output which can be forced on in DTE
mode.
The DTE can use RL to cause the
local DCE to transmit a request for a
Line Loopback to the network. The
resulting Line Loopback can be
terminated while RL is still ON.
TM Indicates whether the port is in Test Mode. On during a Data Port Loopback, off
in the absence of a DPL. Applies to
DCE mode only.
Display Field Description Instructions
Menu Option Description Instructions
Dn) data port loop Used to establish or
terminate a bi-directional
loopback on any of the
QUAD DATA ports.
Typically a loopback is established first, then a test
pattern is started. While the test pattern is being
transmitted, the device sending the pattern monitors
receive data, expecting to receive the same pattern.
Tn) test pattern Selects a Quasi-Random
Signal Sequence (QRSS) or no
test pattern.
Select QRSS QRSS QRSS QRSS to start a test. Select None None None None to end the
test. Test patterns are sent toward the network only,
not to the locally connected device. When a test
pattern is used in conjunction with a data port loop,
always start the test pattern first.
In) insert bit error Used to send an intentional
error in the test pattern. If
the pattern being sent is also
being received, an error will
be counted.
This function is used to verify that the test pattern
being received is actually the same pattern which is
being transmitted. It verifies that a loop is present in
the network or a far-end device.
Fn) send FT1 code Sends an inband loop-up or
loop-down code which
should initiate or terminate,
respectively, a data port
loopback in the far end
QUAD DATA module or DSU.
Select activate activate activate activate to send a loop-up code to the far-end
device. Select deactivate deactivate deactivate deactivate to send a loop-down code
for the purpose of terminating a far-end loopback.
See the section “ Far-End Loopback ” in this chapter.
En) reset test
counter
Sets the Test Error Counter
for the port to zero.
Used to clear old test results before (or just after)
beginning a new test.
X) exit this menu Exits to the menu above. Returns to the QUAD DATA Main Menu .