Raisecom RC905-EE1 User Manual - page 10
10
6
th
bit PCM 31/30 selection dip-switch at fractional E1 pattern.
ON=PCM30
mode also called FAS+CAS mode.
OFF=PCM31 mode, also called FAS only mode (default mode).
This bit setting of dip-switch of two interoperated interface converters should be the same;
otherwise the equipment will not work properly.
7
th
bit CRC4 checkout selection dip-switch on E1 fractional mode.
ON= to disable CRC4 Checkout.
OFF= to enable CRC4 Checkout (default).
It can be set up as per the user’s requirement, but OFF is recommended to conduct
Checkout.
This bit setting of the dip-switch of two interoperated interface converters should be the same;
otherwise the equipment will work not properly.
8
th
bit ON/OFF clock mode selection dip-switch.
ON = Receive Timing following E1 link, also called Slave Clock.
OFF = Local timing, also called Master Clock (default).
This bit setting is effective only at fractional E1 pattern.
If working at fractional E1 pattern, one device should be set up to master clock mode, and
the other should be slave clock mode, otherwise they will not work properly. If DXC, PCM
/MUX equipment is used in the E1 link, there should be only one master clock in the whole E1
link, and the rest equipment just follow E1 link receiving clock.
SW1 Factory Default Setting
Switch
1 2 3 4 5 6 7 8
ON
OFF
■
■
■
■
■
■
■
■
Meaning Full
Timeslot
N=31 PCM31
CRC3
Enable
Master
Clock
Please note: Before applying power supply, in order to prevent excessive power level difference
between equipment along the E1 link, and protect equipment interfaces, it is recommended that
connect E1 link first before turning on the power supply. Try the best not to hot-swap the E1
interfaces.
a. Occupation of forwarding data on fractional E1 mode:
z
Timeslot occupation on the PCM31 mode
On the PCM31 mode, N≤31, the timeslot 0 is occupied by the system. N is counted from
1
st
timeslot.