MODEL7304 User Manual
Page 9 of 11
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
5.3.2
5.3.2 Phase
Phase
Phase
Phase selection
selection
selection
selection
S5.4 is used for the receiving phase selection of V.35 interface.
5.3.3
5.3.3
5.3.3
5.3.3 Settings
Settings
Settings
Settings of
of
of
of loopback
loopback
loopback
loopback test
test
test
test and
and
and
and pseudo-random
pseudo-random
pseudo-random
pseudo-random code
code
code
code test
test
test
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.
Local
Local
Local
Local Loopback
Loopback
Loopback
Loopback Schematic
Schematic
Schematic
Schematic
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.
Local
Local
Local
Local Digital
Digital
Digital
Digital Loopback
Loopback
Loopback
Loopback
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.
Remote
Remote
Remote
Remote Loopback
Loopback
Loopback
Loopback
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.
V.3 5
Fiber Modem V3 5
Optical
Interface
Fiber Modem V3 5
Optical
Interface
V.3 5
Fiber Modem V3 5
V.3 5
V.3 5
Fiber Modem V3 5
Fiber Link
R em ote
Local
