Verilink PRISM 3000 (34-00184) Product Manual - Manual (Page 24)

PRISM 3000 3-8 Operation
Device Info: This field displays the Ethernet or Token Ring
hardware/software revision level.
3.7 Diagnostics
The ‘Diagnostics’ screen allows test and maintenance func-
tions to be performed on the T1 network, the T1 DTE port,
and the high speed ports. The PRISM recognizes inband and
FDL out-of-band loopback requests. The unit also recog-
nizes local testing and remote network management loop-
back test configurations. The PRISM supports many ways to
test the service to and from the unit.
Diagnostics Screen
The PRISM monitors network loopback commands and
activates loops based upon their reception as described in
TR54016 and T1.403 (loops may also be activated through
the EM8000 element manager). Refer to the ‘Diagnostics
Loop Functions’ diagram
page 3 -10 for a depiction of the
loop modes. Also, refer to the ‘Loopback Diagrams’ shown
on page 4 -6. The Diagnostics menu allows for loopback and
BERT functions as explained in the following paragraphs.
T1 Network Loop: The looping choices are as follows
(note that far loops are not allowed during BERT).
NONE: Clears network loops.
LOOP FAR: Sends loop codes over the network to the far
end unit to force it into a NET LLB.
UNLOOP FAR: Sends unloop codes to the far end unit to
remove the loop condition.
NET PLB: The payload loopback selection loops the data
back toward the network. Framing, CRC, and FDL are
regenerated and all ones are passed to the DTE ports.
NET LLB: The local loopback selection loops data
received from the network back toward the network.
Received data is also passed through to the DTE ports as
normal.
NET MLB: Network maintenance loopback loops data at
the T1 DTE port back toward the network (passes network
data to DTE and return data to network). This affects only
network channels assigned to the T1 DTE.
DTE MLB: The T1 DTE maintenance loopback loops
network data back toward the DTE at the network inter-
face. Data is also passed through to the network.
T1 DTE Loop: The looping choices are as follows:
NONE: Clears DTE loops.
LLB: The local loopback selection loops data received at
the T1 DTE interface back toward the T1 DTE. Data is
also passed through to the network.
Port Loop: Ports are indicated as Port 1 through Port 4.
The looping choices for each port are as follows:
NONE: Clears port loops.
NEAR: A bidirectional fractional loop is set at the port
interface.
SEND LOOP: A V.54 in-band loop code is transmitted to
the far end unit to force it into a NEAR loop mode on the
selected port.
SEND UNLOOP: Unloops the far end unit.
BERT Functions: The following menus offer selections for
the BERT port, direction, and pattern along with test results.
BERT Port: This menu item selects the port to be looped.
The ‘
NONE ’ setting disables the BERT generator. The
‘ NETWORK ’ option tests all channels mapped to the net-
work. The ‘ T1 DTE ’ option tests all channels associated
with the T1 DTE port. Selecting a single port tests all the
channels associated with that port.
BERT Channel: This menu item is available only when
‘
BERT Port ’ is set to ‘ Network ’. This allows selection
of a specific DS0 channel (1 to 24) to be tested. Only
unassigned (idle) channels will appear as selections. If
‘
ALL ’ is selected, the entire T1 bandwidth will be tested.
If ‘ IDLE ’ is selected, all unassigned channels are tested.
BERT Pattern: This item specifies which pattern will be
transmitted toward the port being tested. The choices are
‘
1 IN 8 ’, ‘ 3 IN 24 ’, ‘ ALT ’, ‘ CLEAR ’, ‘ QRSS ’, ‘ 63 ’,
‘ 511 ’, ‘ 2047 ’, ‘ 2
15
-1 ’, ‘ 2
20
-1 ’, and ‘ 2
23
-1 ’.
BERT Direction: Selects which direction to send the test
pattern. The choices are ‘
Toward Network ’ and
‘ Toward DTE ’. If the ‘ BERT Port ’ menu is set to
‘ Network ’, the BERT direction is automatically forced
toward the network and this option does not appear.
BERT Results: The following BERT status and error
counts are available through this selection:
Sync Status: This field displays the current state of pat-
tern sync during a test. If no test is in progress, ‘
NO
SYNC ’ is displayed.
Elapsed Time: This field displays the elapsed time
since a timed test began. A value is displayed only
when a test is running (in the
HH:MM:SS format).
Bit Errors: This field displays the total number of bit
errors detected since the test began or since error statis-
tics were last cleared.
Errored Seconds: This field displays the number of
errored seconds that have been detected since the test
began or since error statistics were last cleared.
Diagnostics
T1 Network Loop ---- Loop Far <