Digital Link DL600E E1 Uživatelská příručka stáhnout pdf (Strana 97)

Diagnostics 5-7

Alternate Option

The signal sent is exactly opposite the signal sent in standard mode. This is

useful for testing a remote unit that has other equipment in between the

local and remote. The other equipment does not recognize the signal and

passes it through to the remote.

The Loop NET Test

The Loop NET test, available only on full bandwidth, veriÞes the operation

of the E1 network. (Figure 5-3).

It loops the data received from the E1 network back to the network. The

data is regenerated before it is looped back, however, the DSU/CSU does

not perform additional processing of the data.

This minimizes the impact of the DSU/CSU during the test so that network

problems can be isolated.

Figure 5-3 Loop NET Test

The Loop Payload Test

The loop payload test veriÞes proper operation of the DSU/CSU and the

E1 network (Figure 5-4).

NOTE: The DTE device must be able to recognize its own test pattern

for Loop DTE to verify the DTE cabling and equipment. Without this

capability, the Loop DTE test can only verify the DSU/CSU.

CSU

Local Solo E1

GR617

DTE

Network

Interface

Network

Interface

CSUDSU

DSU

Remote Solo E1

Data

Port

Data

Port

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Digital Link DL600E E1 Uživatelská příručka Strana 97