10
Remark:
Pseudo-random sequence code test can be made only under a loopback status. At
this moment, constantly lightening of LOOP and PTOK/CRC lamps shows local status, flash
shows remote status; TXD and RXD lamps are used for showing the status of local TXD or
RXD.
5.3.4 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.
31 switches, from 2
nd
—32
nd
(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 V.35 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. TS0 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
to “OFF” (other switches are located in such a way that the setting of non-framing is
unaffected) Framing mode: 1st switch is set to “OFF”, and all other switches are set
according to the time slot positions to be used by E1 channel and the rate of V.35 port. (If
it is set to tracking remote time slot, the time slot switch will become invalid)
Attention:
Ex-works S1, S2, S3 and S4 are all set to “OFF”
Attention:
The setting of tracking remote time slot; S5.2 to “ON”; S5.1 and S5.3 to “OFF”