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Configuring HSSI Services
308648-14.00 Rev 00
5-9
There are four DTE loopback settings:
No_Loopback -- Prevents the DTE from sending loopback signals to the
DCE.
Local_Digital (Loop A) -- Allows the DTE to check the DTE/DCE interface.
In a Loop A test, the DTE transmission is returned to the DTE on the received
local DCE data circuit. The CA LED (DCE Ready) must be on.
Local_Line (Loop B) -- Allows the DTE to check the DTE/DCE interface and
the transmit and receive sections of the local DCE. In a Loop B test, the output
of the transmitting section of the DCE is returned to the receiving section of
the DCE. The CA LED (DCE Ready) must be on.
Remote_Line (Loop C) -- Allows the DTE to check the functions of the
transmission path to the remote DCE interface.
Figure 5-2 illustrates how the DTE and DCE transmit loopback signals over
Local_Digital (Loop A), Local_Line (Loop B), and Remote_Line (Loop C).
Figure 5-1. DTE-to-DCE Loopback Testing
Loop A
Local DTE Local DCE
HSSI
Loop B
Local DTE Local DCE Remote DCE Remote DTE
HSSI
Loop C
Local DTE Local DCE Remote DCE Remote DTE
HSSI
HSI0005A
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