TTC T-BERD 107A, Reference Manual

Page: 46 / 261

SECTION 3
3-7
INSTRUMENT
DESCRIPTION
recognized as a pattern) are displayed in lower-
case letters in the MODE and PATTERN dis-
plays. When the received signal is not recognized
as a pattern, the word live appears in the PAT-
TERN display, and the instrument performs as
in T1 TLB mode.
T1 — T1 unframed mode configures the
T-BERD 107A to transmit and receive un-
framed T1 data for testing unframed T1 circuits
or T1 circuits with proprietary framing formats.
T1 D4 — T1 D4 superframe mode configures
the T-BERD 107A to transmit and receive D4
framed T1 data for testing D4 framed circuits.
The T1 D4 mode is compatible with all
superframe framing formats including: D1D,
D2, and D3. While T1 D4 mode framing is
compatible with T1 D1D framing for most test
applications, the channel time slot assignments
are different (see Appendix B).
T1 ESF — T1 extended superframe mode con-
figures the T-BERD 107A to transmit and re-
ceive ESF framed T1 data for testing ESF framed
circuits.
T1 SLC — T1 subscriber loop carrier mode
configures the T-BERD 107A to transmit and
receive SLC framed T1 data when testing
SLC-96 framed circuits. The instrument ignores
the SLC datalink (F) bits in the received signal.
The SLC datalink bits are set to all zeros in the
transmitted test pattern.