Patton electronic 2710 - Manual (Page 19)

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– Clocking: Network (default)
Options: Network, Internal, External
Network: This is the most commonly used setting when connect
ing to a carrier’s network. In this mode, the unit recovers the clock
from the received signal and uses it to transmit data. In this way the
unit remains synchronized to a master clock. In campus applica-
tions, one of the units must be set to Internal clock, and the other
end is set to Network clock. At all times, there must be only one
clock source. Otherwise, clock slips and framing errors and bit errors
may occur.
Internal: This is commonly used in campus applications, where the
unit is not connected to the public telephone network directly. In this
mode, the unit uses the on-board oscillator as the transmit clock
source.
External: This is a special mode that should only be used with the
Unframed format. In this mode, the unit requires a 1.544 Mhz clock
signal from the DTE via the external clock pin on the DTE interface
connector. Most applications will use Network or Internal clock
modes.
– Line Build Out (dB): 0-133 feet, 0 dB (default)
Options: 0 – 133 feet, 0 dB
133 – 266 feet
266 – 399 feet
399 – 533 feet
533 - 655 feet
-7.5 dB
-15.0 dB
-22.5 dB
This controls the transmitter signal strength and pulse shape. For most
applications, the default setting will sufÞce. When connecting to a carrier
connection, the carrier will determine what LBO is necessary. 0 dB pro-
vides the highest signal strength and therefore the longest distance,
while –15.0 dB provides the lowest usable signal strength. The last set-
ting, –22.5 dB, is usually only used to test the line and should not be
used in normal applications.