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Issue 5, February 2011
61213075L2-5E
shows an active test pattern to the network.
The error count display for the test pattern will count to
and hold at 65535 errors. A loss of pattern sync will
cause the count to increment to 65535. Reset the error
count by selecting “Reset Pattern Errors”. If a test
pattern is active to the network, then a pattern of
unframed all “ones” is transmitted toward the customer.
The pattern that is sent can be selected using the Pattern
Type option. Patterns available include 2^23-1, QRSS,
Blue, Idle, and User Defined.
The following sequence is the factory default for the
user defined pattern:
0000 0000 1111 1111
If a test pattern is active to the customer, then framed
DS3 idle is transmitted toward the network. The
Framing for Pattern option selects the framing for the
test patterns for both the network and the customer, and
it can be set to C-BIT, M13, or UNFR (unframed). The
Timing Source for Pattern option selects whether the
received network DS3 signal (NTWK) or the NIU3 PM
local reference clock (LOCAL) will be used as the clock
for the transmitted test pattern.
The timing source for the pattern is set to Network to
preserve network timing. If a network signal is not
present or if a loopback removes the timing reference
from the network signal, local timing can be used for
pattern testing.
Figure 14. Loopback and Test Commands Screen, Pattern Active
CIRCUIT ID: xxxxxxx 03/01/04 13:04:03
Press ESC to return to previous menu
Loopback and Test Commands
______
Errs: 00000 | NIU3 | 1. Loopback Network
----------->| |----------> 2. Loopback Customer
| | 3. Dual Loopback
| |
NET | | CUST 4. Send Pattern to Network
| | 5. Deactivate Pattern to Network
| |
<--2^23-1--| |<---------- 6. Send Pattern to Customer
|______| 7. Deactivate Pattern to Customer
8. Pattern Type 2^23-1
9. Framing for Pattern C-BIT
10. Timing Source for Pattern LOCAL
Pattern
Errors 11. Insert Bit Error
------- 12. Reset Pattern Errors
Network 00000
Customer N/A
Selection:
Содержание DS3 NIU3 PM
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