MODEL7302 User Manual
Page 9 of 10
Remote Loop back
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 E1 output terminal and tests
whether E1 input signal is in compliance with this sequence standard, so as to judge
whether the device and line transmission have an error code.
Pseudo-random Code Test
Remark: Pseudo-random sequence code test can be made only under a loop back status. At
this moment, constantly lightening of LOOP and PTOK/CRC lamps shows local
status, and flash shows remote status.
5.3.3 Framing/non-framing and time slot settings
Totally 32 coded switches S1, S2, S3 and S4 are used for E1 time slot setting.
E1 Time Slot Setting
1
st
switch (S1.1) is used for controlling E1 framing/non-framing. “ON” refers to
non-framing mode (2.048Mbps).
31 switches, from 2nd—32nd(S1.2~S1.8, S2, S3, S4), are respectively used for
controlling the selection of 1
st
–31
st
time slots. Set at “ON”, the corresponding time slot is
selected; set at “OFF”, the corresponding time slot is not selected. The rate of E1
interface is completely dependent on the number of the selected time slots. For example:
the setting of 3
rd
switch to “ON” and all other switches to “OFF” indicates that 2
nd
time
slot is selected, at this moment the rate is 64K; the setting of 7
th
and 8
th
switches to “ON”
and all other switches to “OFF” indicates that 6
th
and 7
th
time slots are selected, with a
rate of 2×64K=128K. TSO setting is used for specifying E1 frame to be transparent or
framing: “0”--framing, “1”--non-framing. But the bit has to be specified in combination
with other time slots. TS16 setting is used for controlling E1 frame structure to be
PCM30
（
CAS
）
or PCM31
（
CCS
）
: ‘0’—PCM30, at this moment 16
th
time slot must not
be used for transmission service; ‘1’—PCM31, 16
th
time slot can be used for transmission
service. Besides, TS1—TS31 are respectively used for controlling the selection of
1
st
—31
st
time slots: ‘1’—the corresponding time slot is selected; ‘0’—the corresponding
time slot is not selected.
Typical application
：
Non-framing mode: 1
st
switch is set to “ON”, and all other switches
FE1 Fiber Modem
E1
E1
FE1 Fiber Modem
Fiber Link
Remote
Local
E1
E1
FE1 Fiber Modem
FE1 Fiber Modem
Local
Remote
Fiber Link
