EXFO FTB-800 Series for FTB-1 - Manual (Page 158)

Test Setup - Test Configurator, Timer, and System
148 FTB-700G/800 Series
ISDN PRI - ISDN Settings
ISDN PRI - ISDN Settings
From the Test menu, tap Setup, Test Configurator, the test block, and the
ISDN Settings tab.
D-Channel

Channel indicates the channel selected to establish the ISDN signalling
path. The default D-Channel for DS1 is 24 and for E1 is 16.

Rate represents the rate at which data is exchanged. Depending on the
network, the options available are 56K and 64K (default).

HDLC Mode represents the bit inversion of the signal:
Normal (default) or Inverted.

D-Channel indicates the status of the D-Channel. A green arrow
pointing up indicates that the link is up (L2 - Multiple frame
established) and a red arrow pointing down indicates that the link is
down.
B-Channel
Note: The following B-Channel settings apply to all data calls.

Data Call Pattern allows to select the pattern: PRBS9,
PRBS11 (default), PRBS20, 1111, 1100, 1010, 0000, 1 in 8, 1 in 16,
2 in 8, and 3 in 24.

Invert check box when selected (cleared by default) inverts the test
pattern meaning that every 0 will be changed for 1 and every 1 for 0.
For example, the pattern 1100 will be sent as 0011.

RX Pattern Analysis check box when selected enables the monitoring
of the test pattern for all data calls.

BER Pass/Fail Verdict allows to enable bit error pass/fail verdict by
selecting either Bit Error Count or Bit Error Rate (default) or
Disabled.