User guide

DS3 Test
244 AXS-200/805/855
Setup Configuration
Term-DSX: Select this mode to perform intrusive DS3 tests, for e.g.
straight-away BERT tests, loopbacks, NIU emulation, etc.
Term DSX-HI: Changes the transmit signal to a rectangular pulse of
0.90 V.
THRU: Select this mode for intrusive through-mode testing.
Through-mode allows you to place the AXS-805/855 in series with a
RCV or XMT pair for monitoring errors and alarms. The AXS-805/855
receive recovers the DS3 signal and passes it to the transmit circuitry,
framing and signal format is regenerated.
THRU-NoGen: Select this mode for intrusive through-mode testing
with framing and signal format passing directly through transmit
circuitry without regenerating framing errors, BPV, alarms, etc. Any
error detected on the RCV pair will be passed through XMT pair. The
AXS-805/855 still captures and display all received errors.
³ Clocking: Select the clock source. Choices are Network/looped-timed
(NW) and Internal Clock (INT). The default setting is
Network/looped-timed (NW).
³ Framing: Select the framing. Choices are C-bit, M13, Unframed, and
Auto. The default setting is Auto. When Auto is selected, it detects the
incoming framing signal.
³ Coding: B3ZS coding is always selected for DS3, you cannot change
this setting.