EXFO FTB-8510B Guia Del Usuario página 1171

LBO (Line Build Out): Allows the selection of the interface Line Build
Out that meets the interface requirements over the full range of cable
lengths. Available with DS1 interface only. Choices are: +3.0 dBdsx
(533-655 ft), +2.4 dBdsx (399-533 ft), +1.8 dBdsx (266-399 ft),
+1.2 dBdsx (133-266 ft), and +0.6 dBdsx (0-133 ft).
Line Coding: Allows the selection of the interface line coding. Choices
are AMI and B8ZS for DS1; AMI and HDB3 for E1.
Note: Line Coding is not available with 2 MHz interface.
Framing: Allows the selection of the interface framing. Choices are SF
and ESF for DS1; PCM 30, PCM 30 CRC-4, PCM 31, and PCM 31 CRC-4
for E1.
Note: Framing is not available with 2 MHz interface.
Clock Mode: Allows the selection of the source clock that will be used
to generate the clock on the selected interface type. Choices are:
Internal: Internal clock of the unit (STRATUM 3).
Recovered: Clock from the test optical/electrical port input signal.Not
available on the FTB-8140.
Backplane: 8 kHz clock from another module on the FTB-500. Note
that the other module must support the backplane clock feature and
must be enabled (refer to Backplane on page 526 for more
information).
SONET/SDH Application
System Tab
Clock Synchronization
521