Verilink PRISM 3301 (34-00239.5) Product Manual Instrukcja Użytkownika Pobierz pdf (Strona 34)

26 CHAPTER 4: TERMINAL INTERFACE

Test Commands

The TEST commands perform loop and system tests on the unit. The PRISM 3301

provides three loopback options to assist in diagnosing transmission difficulties.

These loopbacks can isolate a specific section of the transmission line allowing

accurate testing of line integrity and transmission devices. Each command is

followed by one or more keywords with each keyword separated by a space.

Only one loopback can be performed at a time.

TEST LOOP LOCAL DTE SET

This command performs a local DTE loopback test. The Local DTE Loopback can

be initiated and cleared from either user interface. The Local DTE Loopback loops

the incoming data from the local DTE back directly through the DTE connector

interface, after the digital receive circuit, as shown in Figure 4-3. During the

loopback, and AIS signal is sent to the network.

Figure 4-3

Local DTE Loopback

TEST LOOP LOCAL DTE CLEAR

This command clears the local DTE loopback test.

TEST LOOP LOCAL LINE SET

This command performs a local line loopback test. The Local Line Loopback can

be activated and cleared from either user interface. The Local Line Loopback loops

the DTE data back through the digital transmit and receive section of the PRISM

3301, as shown in Figure 4-4. When a local line loopback is active, an AIS signal

is sent to the network.

Figure 4-4

Local Line Loopback

TEST LOOP LOCAL LINE CLEAR

This command clears the local line loopback test.

TEST LOOP REMOTE SET

This command performs a remote loopback test.

✍

DTE DTE

Local 3301

Remote 3301

DTE

Local 3301

Remote 3301

DTE

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Verilink PRISM 3301 (34-00239.5) Product Manual Instrukcja Użytkownika Strona 34