Verilink Access Manager 2000 (896-502037-001) Product Manua Manual de usuario descargar pdf (Pagina 320)

100

101

Monitoring and Troubleshooting Access Manager

8-50

Access Manager 2000 User Manual

Figure 8-1 DIU 2140 loopbacks

The selected data equipment transmitter is connected to the data receiver

through the associated interface driver and receiver in the DIU. This

looping path allows you to check the operation of the data equipment and

associated cabling to the DIU. The data port of the DIU is also looped

back toward the far-end EQP. This path allows you to perform end-to-end

data port tests and check the EQPT circuit end-to-end.

Before starting this procedure, determine the appropriate CSU timing for

the DIU loopback. For example, avoid split timing: when a DIU loopback

is set, THROUGH timing with non-synchronized timing sources for

receive data and transmit data is invalid and introduces errors.

In general, DIU loopbacks may introduce errors if the CSU is THROUGH

timed.

To activate or deactivate DIU loopbacks

1. When you get the On-line Access sub-menu, select the

Loopbacks option.

2. The Specify Circuit Element to Receive Loopback screen appears.

• The first field is DIU Shelf Numbe . Enter the shelf

number of the plug-in DIU circuit element which will receive

the loopback request.

• The second field is DIU Plug Numbe . Enter the slot of the

plug-in DIU circuit element which will receive the loopback

request.

DIU 2140

EQUIPMENT

Driver

Receiver

INTFC

and

Logi

Circuits

RS422

CPU

XMTR

CPU

RCVR

XMTR

and

RCVR

DUSARTs

BACKPLANE

DATA BUS

TO/FROM

NCC 2020

TAC 2010

Procedure for

loopbacks

1 2 ... 315 316 317 318 319 320 321 322 323 324 325 ... 399 400

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