Phase Phase Phase Selection Selection Selection; Settings Settings Settings Of Of Of Of Loopback Settings Loopback Loopback Test Test Test And And And Pseudo-Random Pseudo-Random Pseudo-Random Code Code Code Test Test Test - 3One data 7304 User Manual

All manuals and user guides at all-guides.com
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 5.3.2 Phase 5.3.2 5.3.2 Phase Phase selection Phase selection selection selection
S5.4 is used for the receiving phase selection of V.35 interface.
5.3.3 5.3.3 Settings Settings of of of of loopback Settings loopback loopback
5.3.3 Settings 5.3.3 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.
V.3 5
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 test and and pseudo-random pseudo-random
test and and pseudo-random pseudo-random code
Optical
Fiber Modem V3 5
Interface
Local Local Loopback Loopback Schematic Schematic
Local Local Loopback Loopback Schematic Schematic
V.3 5
Fiber Modem V3 5
Local Local Digital Digital Loopback Loopback
Local Local Digital Digital Loopback Loopback
Fiber Modem V3 5
Fiber Link
Local
Remote Remote Loopback Loopback
Remote Remote Loopback Loopback
Page 9 of 11
MODEL7304 User Manual
code code test test
code test test
Optical
Interface
V.3 5
Fiber Modem V3 5
R e m o te