Alcatel Omni Switch/Router User Manual page 912

Obtaining Status and Statistical Information
Clocking
This field indicates the type of clocking used to clock transmit and receive data in and out of
the serial port. When the clock is out-of-phase, you receive errors. If this value is set to Exter-
nal, then clocking is controlled by the external
end of the cable from the
a physical
DTE
If this value is set to Internal, then clocking is controlled by the internal
nal clocking should only be selected if the
RS-232 cable. Internal clocking is the default when the WSX is a physical DCE device and an
cable is connected to this port. For T1 and E1 ports, internal clocking is equiva-
RS-232 DCE
lent to local timing.
Split clocking, which is also known as "loop timing," uses additional control signals (
and ) to keep the
RXCE
signals (TX clock and RX clock) and loops them back out to the
these additional signals to communicate the current status of their clocks. Split clocking
should only be used if the
cable, such as
Split clocking is the default when the
cable is connected to the port. For T1 and e1 ports, external or split clocking is the same as
loop timing.
Page 29-40
port). External clocking is the default option when the
WSX
device (i.e., controlled by an external
See Chapter 49, "Managing
mentation on setting the clocking mode for serial ports,
see Chapter 54, "Managing
mentation on setting the clocking mode for
ports, and see Chapter 55, "Managing
for documentation on setting the clocking mode for
and ports.
DS3 E3
The Clocking value only makes a difference if the
port is a physical
DCE
the port). If the
WSX
then Clocking will default to External.
and clocking in sync. Split clocking takes the incoming clock
WSX DSU
is a physical
WSX
.
V.35
o Important Note o
Split clocking is required if the access rate of the Frame
Relay line is greater than 256 Kbps. If Split clocking is
not used at these data rates, then data out-of-phase
errors, aborts, or CRC errors may occur.
WSX
(a or other
DCE DSU
device).
DCE
Note
Modules," for docu-
WAN
and Ports," for docu-
T1 E1
T1
/ Modules,"
DS3 E3
is a physical
WSX DCE
Note
port (i.e., cable plugged into
DCE
port is a physical
WSX DTE
device and you are using a non-
DCE
is a physical device and a non-
DCE
device on the other
DCE
WSX
and
E1
(the ). Inter-
DCE WSX
device and you are using an
WSX
port,
TXCE
. The and uses
DSU WSX DSU
RS-232
RS-232 DCE
is