Raisecom RCMS2101-30-FV35 User Manual - page 12
Raisecom Technology Co., Ltd
11
z
The 7
th
and 8
th
bits: clock mode option
7
th
bit
8
th
bit
Timing Resource Option
OFF OFF Master
Clock
(Internal)
OFF ON V.35
Terminal
Clock
ON OFF Vacant
ON
ON
Slave Clock (follow the link clock)
Users are advised to select the most suitable timing resource. When configuring clock modes, V.35 DTE
interface on Routers shall also be configured. Both TX and RX clock shall be External Clock mode at
V.35 interface that connected with Master/Slave Clock equipment. The TX Clock shall be Internal Clock
mode and RX Clock shall be External Clock mode at the V.35 interface that connected with Terminal
Clock equipment.
z
The factory default settings of SW1: All OFF
Switch 1
st
bit
2
nd
bit
3
rd
bit
4
th
bit
5
th
bit
6
th
bit
7
th
bit
8
th
bit
Default OFF OFF OFF OFF OFF OFF OFF OFF
Details
N=31,V.35 bandwidth 1984K
Bandwidth
Master
Control
Master Clock
Mode
4.3.2. The setup for SW2: factory default setting all OFF
1
st
bit
2
nd
bit
3
rd
bit
4
th
bit
Definition
TX CLK
phase
RX CLK
phase
PCM30/31
Option
CRC
function
option
ON
Negative Negative PCM30 Disable
OFF
Positive Positive PCM31 Enable
z
Since the relationships between V.35 data and clock phase are different on different brand Routers,
TX CLK and RX CLK phase options are used to solve the problem.
TX CLK positive: TD signal will be sampled at the falling edge of TCK clock signal
TX CLK negative: TD signal will be sampled at the rising edge of TCK clock signal
RX CLK positive: RD signal will be sampled at the falling edge of RCK clock signal
RX CLK negative: RD signal will be sampled at the rising edge of RCK clock signal
z
PCM30/31 option. When other equipment (i.e. DXC, MUX) in the link requires the frame format to
be PCM30, the modem shall be configured to PCM30 (N≤30); when requires the frame format to be
PCM31, the modem shall be configure to PCM31 (N≤31). The local and remote sites shall have the
same configuration.
z
CRC option. Disable/Enable the CRC function according to the link requirement. The local and
remote sites shall have the same configuration.