User manual

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1 2 3 4 5 6 7 8
ON
OF
When setting loop-back test by the switch on the bottom panel, the definition of the 6th bit changes
to loop-back type option.
6th bit After setting of loop-back, choose loop-back type
OFF Remote E1port loop-back
ON Local V.35 port loop-back
Please see the definition of the 5th bit of switch on the bottom panel for content of loop-back test.
4) 7th and 8th bit: clock mode option
7th bit 8th bit Clock mode option
OFF OFF Master Clock Mode (Internal clock)
OFF ON V.35 Terminal Clock Mode
ON OFF Not in use
ON ON Slave Clock Mode (following E1 link clock)
Choose the clock mode that is suitable for your application according to connection method in
Chapter 2. The V.35 DTE interface of Router should be set as: both Tx Clock and Rx Clock
External at the connected V.35 interface in Master and slave Clock Mode, i.e. the default status; Tx
Clock Internal
 Rx Clock External at connected V.35 interface in Terminal Clock Mode.
5) The factory default dip-switch settings on front panel: all OFF
Dip-switch 1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit
Default OFF OFF OFF OFF OFF OFF OFF OFF
Meaning N=31 V.35 bandwidth 1984K
Active
bandwidth
control
Master Clock
Mode
2. Definitions of dip-switch (extended setting) on the bottom panel
There is also a not-frequenty-used dip-switch on the bottom panel.
Note that the main difference between this dip-switch and the one on front
panel is: the “lower position” is ON in the dip-switch on front panel, but the
“upper position” is ON in the dip-switch on bottom panel.
1) Definitions of 1st ~ 5th bit
1st bit 2nd bit 3rd bit 4th bit 5
th
bit
Definition
TX CLK phase RX CLK phase PCM30/31 option
CRC function
option
Loop-back test
switch
ON Negative Negative PCM30 effective Disabled Loop-back test
OFF Positive Positive PCM31 effective Enabled Normal work
z TX CLK and RX CLK phase option is for differences of phase relationships of V.35 interface
clock and data according to different branded Routers. When both TX CLK and RX CLK are
set as positive, the test at V.35 synchronous WAN port of Cisco series Routers is success.