3One data 7304 Gebruikershandleiding - Pagina 9

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Local main timing (S5.1=ON, S5.2=ON): the sending timing is of local crystal OSC, and

the received data, after buffering, is synchronized with local timing.

5.3.2

Phase

selection

5.3.2

5.3.2 Phase

Phase selection

selection

S5.4 is used for the receiving phase selection of V.35 interface.

5.3.3

Settings

Settings of of of of loopback

loopback

5.3.3

5.3.3 Settings

loopback test

S5.5～S5.8 of coded switch S5 are used for setting the loopback test and pseudo-random

code test.

S5.5 is local loopback control （LLOOP） and optic interface is directly looped back to

V.35 interface. "OFF" indicates normal operation; "ON" indicates local loopback test.

The default is "OFF". It is used for testing whether local device is in normal operation.

S5.6: local digital loopback control (DLOOP). "OFF" indicates normal operation; "ON"

indicates local digital loopback. The default is "OFF". With a loopback from local V.35

interface to E1 optic interface, it is used for testing whether the remote device and E1

optic line are in normal operation.

S5.7:"OFF"indicates normal operation ； "ON"indicates command remote loopback. The

default is "OFF". As this command must be sent through E1 optic line to remote end for

validness, it will become invalid at the following two cases: ① the remote end is not

V.35 Fiber Modem device; ② V.35 Fiber Modem is working at a non-framing status, at

this moment all time slots of E1 are used for transmitting the data from V.35 interface at

a rate of 2048Kbps. Through a transmission of loopback command from local device to

remote device, the command remote loopback is achieved.

V.3 5

S5.8: Pseudo-random code test control (PATT). "OFF" indicates normal operation; "ON"

indicates pseudo-random sequence test. The default is "OFF". It generates a

pseudo-random sequence code to be transmitted to V.35 optic line output terminal and

tests whether V.35 optic line input signal is in compliance with this sequence standard,

so as to judge whether the device and line transmission have an error code.

test

and

pseudo-random

test and

and pseudo-random

pseudo-random code

V.3 5

Fiber Modem V3 5

Local

Loopback

Local

Local Loopback

Loopback

Loopback Schematic

V.3 5

Fiber Modem V3 5

Local

Digital

Local

Local Digital

Digital Loopback

Fiber Modem V3 5

Local

Remote

Remote Loopback

Remote

code

test

code test

test

Optical

Interface

Schematic

Optical

Interface

Loopback

Fiber Modem V3 5

Fiber Link

R e m o te

Loopback

Page 9 of 11

MODEL7304 User Manual

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