3 testing, Introduction, Indicators – Verilink DDS Lite (34-00295.C) Product Manual User Manual
Page 17: Network, Tx data, Rx data, Loop test, Loopbacks, Channel loop, Introduction indicators
3
T
ESTING
Introduction
This chapter describes the diagnostic and test features of the
Verilink Multi-Rate DDS CSU/DSU. The unit is controlled
manually using DIP switches (the DIP switches are discussed on
page 8). The indicators are described below.
Indicators
The unit indicators show major alarm conditions, power, and
loop status.
Network
This three - color indicator shows the receiver’s operating status.
Green indicates a signal at the receiver (either customer data or
zero suppression). Amber indicates signal is present, but received
data is idle or out of service. Red indicates an insufficient signal
for the receiver to operate properly.
Tx Data
This three - color indicator shows the status of the transmitted
data. Green indicates marks. Red indicates spaces. Amber
indicates alternate marks and spaces.
Rx Data
This three - color indicator shows the status of the received data.
Green indicates marks. Red indicates spaces. Amber indicates
alternate marks and spaces.
Loop Test
This indicator show the loop status of the unit. Amber indicates
the unit is in loop mode. When the indicator is Off, the unit is
not in loopback.
Loopbacks
This section describes loops that can be initiated on the
Multi-Rate DDS CSU/DSU.
Channel
Loop
This loop (shown in Figure 3-1) is activated by the reversal of
the simplex, 20 mA sealing current. This is a unidirectional loop
that ignores the DSU transmit data and retransmits the received
DDS data. Receive data is unaffected and circuit CF is forced
Off.
Figure 3-1 Channel Loop (Mandatory Loop)
DTE
NET