Switch S2 — Data Port LOS Processing
Some DTE equipment changes the state of the RTS and/or DTR signal
lines on a regular basis which the D-SERV DSU/CSU may interpret as
an LOS condition. Options for determining a data port LOS condition
are if the RTS signal line is de-asserted, the DTR signal line is
de-asserted, or if both of the signal lines are de-asserted at the same
time. The D-SERV DSU/CSU also provides the option of not
monitoring for data port LOS by ignoring the condition of the RTS
and DTR signal lines.
Switches S2-7 and S2-8 configure this option.
NOTE:
If a data port LOS condition occurs, all active channels
will transmit All Ones out to the network. All idle
channels will continue to transmit Idle code. If the unit
has been configured for data port timing (tail circuit
timing) the timing source will switch to internal clock
timing.
Switch S2 — Data Port LOS Processing
Function
7
8
RTS
Down
Down
DTR
Up
Down
RTS and DTR
Down
Up
None
Up
Up
Figure 5. S2 Location
Operator's Manual
9