Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 77)

56K NMS Option Overview
Verilink 6-17
Figure 6 Choices for Latching loop backs
Channel The DDS code S 0 1 0 1 0 0 0 is placed in the channelized
data.
DSU The DDS code S 0 1 0 1 1 0 0 is placed in the channelized
data.
OCU The DDS code S 0 1 0 1 0 1 0 is placed in the channelized
data.
Sending Diagnostic Test Patterns
Once the loop is established, you can send the test pattern from the
near end unit. The test pattern is placed only in the channel
allocated to the port being tested.
The example circuit shown in Figure 7 illustrates the diagnostic
capabilities provided by AS2000 within the DDS network that is
accessible from AM2000.
Figure 7 DIU 2 130/DDS) Example Test Pattern Circuit
In this example, a DIU 2130 with DDS capability is connected to a
ConnecT 56k DSU at the far end. To test the network circuit, a
remote loop-back is first activated. In a DDS circuit to a
ConnecT 56, either a DDS latching loop or a V.54 loopback option
can be used to perform the remote loop-back.
ConnecT
56K DSU
Backplane
NCC 2020 DIU 2 130
AS2000 Shelf
DTE Port
T1
56K
Management
Test Pattern
Port (RS232)
AM2000
PC-compatible
Central Office
Buses