Black Box MD1641A Manuale Utente

In this test, your modem must be On-line with another modem set up 
to respond to a request for Digital Loopback, such as another Series II
Modem. With the Modem, this ability to respond is controlled by the

command. 

enables the response to Digital Loopback Test

(remote/automatic). 

disables the response. The modem

defaults to disable on power up, so this must be changed on the remote
modem before the modem will respond to a request for the Digital
Loopback Test (remote/automatic). 

Initiate the Digital Loopback Test (remote/automatic) with the 

command which automatically places the remote modem in digital
loopback mode. Data from your computer or terminal are transmitted
through your modem, and over the phone line to the remote modem,
where they are then looped back to your modem. See Figure 8-3.

The test procedure is as follows:

1. 

Go into Terminal mode. Type

and hit ENTER; you should get

an OK message. 

2.

Dial the remote modem by entering the Dial command and the
phone number, to establish On-line mode. 

The 

command must be set on the remote modem to

run this test.

Computer

or Terminal

Computer

or Terminal

Local Series II

Modem

Remote Series II

Modem

Type 

in Terminal mode; hit ENTER;

dial remote modem; establish On-line

mode; enter escape sequence; type 

and hit ENTER

digital

analog

analog

digital