Verilink QUAD DATA (880-503319-001) Product Manual - Manual (Page 29)

Configuration
Verilink QUAD DATA User Manual 3-5
Cn) clock option Sets the source of the
clock signal used to
control the sampling of
Transmit Data by the port
and the phase relationship
of that clock signal to
Transmit Data.
Use TT whenever the
QUAD DATA port is
connected through a
crossover cable to another
DCE device, such as a
CSU/DSU (tail circuit
timing).
Type “C1” to select the
clock option for port 1,
“C2” for port 2, “C3” for
port 3, or “C4” for port 4.
Since X.21 uses a single
clock pair (S) for all clock
functions, this option is
not selectable when the
interface type is X.21.
ST—The port samples the transmit data lead during the
negative going transition of the transmit clock signal
provided by the module. This is the default setting which
is most often the best selection.
INV ST—The data port samples the transmit data lead
during the positive going transition of the transmit clock
signal provided by the module. This setting may be
helpful if sampling errors occur because of a long cable
between the DTE and the QUAD DATA module, and/or
when the data rate is very high.
TT—The data port samples the transmit data lead during
the negative going transition of an external clock signal
provided by the DTE. This external clock is usually the
transmit clock signal which the QUAD DATA module
provides, simply fed down the cable to the DTE, which
wraps it back to the port. This is done to control the
phase relationship between the transmit data and the
sampling of the data port. Most types of DTE do not wrap
clock back to the DCE, therefore with most DTE this
feature will not operate. When it is known that the DTE
does wrap clock back to the DCE, it is advantageous to
use this feature, as sampling errors caused by cable-
induced phase angles are prevented.
On) enable LOS
detect
Enables or disables the
monitoring of the Data
Terminal Ready lead (DTR)
on a per port basis.
If enabled, the QUAD DATA module will declare a Loss Of
Signal (LOS) alarm whenever the DTR lead is not asserted
by the DTE. This feature allows the detection of a DTE
failure or disconnected DTE cable.
An) remote
loopback
Enables or disables
loopbacks per port.
If loopbacks are disabled, operator requests for remote
loopbacks and received loop codes are ignored. Enable
loopbacks is most often the best selection.
Ln) X.21 C/I
setting
When the interface type is
X.21, allows the Indication
lead to be forced on.
If the port is in DCE mode, allows the Indication lead (I) to
be forced on. (Indication combines the functions of CTS
and DCD). DTE mode is not supported, the lead called
Control (C) can not be forced on.
SRn) DTR/DSR
setting
Allows the Data Terminal
Ready (DTR) or Data Set
Ready (DSR) lead to be
forced on.
When not forced, DSR is
on if DTR is presented by
the DTE and no red alarm
condition exists.
In DCE mode, this option allows DSR to be forced on—the
QUAD DATA module provides DSR and ignores the true
state of DTR.
In DTE mode, this option allows DTR to be forced on as an
output to the connected device regardless of the actual
state of DSR.
SSn) RTS/CTS
setting
Allows the RTS or CTS lead
to be forced on.
When not forced, CTS is on
if RTS is presented by the
DTE and no red alarm
condition exists.
In DCE mode, this option allows CTS to be forced on—the
QUAD DATA module provides CTS and ignores the true
state of RTS.
In DTE mode, this option allows RTS to be forced on as an
output to the connected device.
SDn) DCD/LL
setting
Allows the Data Carrier
Detect (DCD) or Local
Loopback (LL) leads to be
forced on.
In DCE mode, allows DCD to be forced on. Normally DCD
is on only when a circuit is built from the QUAD DATA
port to a network port on another module.
In DTE mode, allows LL to be forced on. Force LL on only
for testing.
Menu Option Description Instructions