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3-22 GB1400 User Manual
Synchronization (LOCK) Threshold
The current synchronization threshold depends on pattern, and the setup of the
SYNC Menu, as summarized in the table below:
Table 3-5. Synchronization Threshold
Pattern Type Threshold How to Set
PRBS 1,024 errors in 4,096 bits
(BER = 2.5 E-01)
Fixed
All WORD patterns (up to 16
bits) when 1-Mbit Option not
installed.
128 errors in 4,096 bits
(BER = 3.1 E-02)
Fixed
All WORD, mark density, or
other ROM patterns with 1-Mbit
Option installed.
Based on 256 errors in a rolling
window of x bits. Nine BER levels
available:
1: 3.1 E-02
2: 7.8 E-03
3: 1.9 E-04
4: 9.7E-04
5: 4.8 E-04
6: 2.4 E-04
7: 1.2 E-04
8: 6.1 E-05
9: 3.0 E-05
Use SYNC Menu to select
a synchronization level from
1 to 9.
You can change the synchronization threshold for (long) WORD, mark density,
and ROM patterns using the SYNC Menu as follows:
Procedure to Set SYNC Threshold
1. Press the F1 key to enter the Menu system.
2. Press F4 key to enter the WORD submenu.
3. Press the F1 key (MORE) until the SYNC option appears.
4. Press F2 (SYNC).
5. Use the pattern up/down keys to select a synchronization threshold level
from 1 to 9.
6. When done, press F4 to enter your choice.
7. Press F1 multiple times until you have exited the Menu system.
NOTE: See later in this chapter for a further explanation of the SYNC Menu.