DSU Operations
5-113610-A2-GB41-60 March 1999
Circuit Quality
Circuit Quality (CircQ) only appears when a V.32
DBM is installed. The report shows the level and quality
of the signal being received from the network by the V.32
DBM.
To access the Circuit Quality status report from the
top-level menu, make the following selections:
•Local (F1), or Remot (F2) and Address
•Stat
•CircQ
Results
The following is displayed for the local or remote
device selected:
F1
Circuit Quality:
S / N Ratio: 26d B
F2 F3
When there is no dialed call, all values are reported as
an x.
Table 5-4 lists the circuit quality measurements and the
range of possible values. Press the key to display
additional measurements, one display at a time.
Terminal Power
Terminal Power (TPwr) shows the status of the
connected DTE’s EIA-232-D or V.35 interface. The DSU
checks the state of the request-to-send (RTS) lead and
reports the DTE powered ON if the voltage is
approximately less than –3V or greater than +3V for both
EIA-232 and V.35 interfaces.
To access the Terminal Power report from the top-level
menu, make the following selections:
•Local (F1), or Remot (F2) and Address
•Stat
•TPwr
Results
NOTE
The Terminal Power report is only
generated for the DTE connected
to the DSU (Port 1) when a TDM
or MCMP is installed.
The following report displays for the local or remote
device selected. If power is detected on the RTS, the
second line displays On. If no power is detected on the
RTS lead, the second line displays Off.
F1
Prt1 Term Power:
On
F2 F3
Table 5-4
Circuit Quality Measurements
Measurements Information Displayed Range Of Possible Values
S/N ratio Signal-to-noise ratio (dB) 9 dB to 27 dB
Sig Level Signal level (dBm) 0 dBm to –50 dBm
BitErrR Bit error rate (factor of 10, e.g.: <10 to 06>) <10— 00 to <10 — 71
RndTrip Roundtrip delay (ms) 23 ms2 — 1700 ms
110 to 06 = 1 error in a million bits (106).
2A roundtrip delay of less than 23 ms is reported as 23 ms.