Avaya Configuring WAN Line Services Uživatelský manuál stáhnout pdf (Strana 101)

Configuring HSSI Services

117345-B Rev. 00

5-9

Setting Up DTE Loopback Testing

On ASN and System 5000 platforms, the DTE loopback diagnostic function

provides loopback testing to the DCE. When the DTE (router) transmits a

loopback signal to the DCE, the DTE waits for the DCE to acknowledge and

return the signal. The DCE provides the transmit and receive clock signals over a

full-duplex DTE-to-DCE connection. The DCE provides the transmit and receive

clock signals.

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).

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Avaya Configuring WAN Line Services Uživatelský manuál Strana 101