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Configuration
3-24
9664-A2-GB20-00
March 2000
Configuring the User Data Port
Select Physical to display or change the physical characteristics of the user data
port connected to the DTE (see Table 3-5).
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Physical
Table 3-5. User Data Port Physical Interface Options (1 of 2)
Port Type
Possible Settings: E530, V.35, X.21
Default Setting: V.35
Selects the type of port to be used for the user data port.
E530 – The port is an EIA-530A-compatible DCE. An EIA-530-compatible DTE can be
directly connected to the DB25 connector.
V.35 – The port is a V.35-compatible DCE. A V.35-compatible DTE can be connected to
the DB25 connector by using an adapter cable.
X.21 – The port is a V.11/X.21-compatible DCE. A V.11/X.21-compatible DTE can be
connected to the DB25 connector by using an adapter cable.
Transmit Clock Source
Possible Settings: Internal, External
Default Setting: Internal
Determines whether the DTE’s transmitted data is clocked into the FrameSaver unit by
its internal transmit clock or by the external clock provided by the DTE.
NOTE: Changing settings for this configuration option causes the FrameSaver unit
to abort any physical port tests, including any DTE-initiated loopback tests.
Display Conditions
– This option does not appear when Port Type is set to X.21 (the
signal is assumed to be asserted).
Internal – The FrameSaver unit uses the interchange circuit DB (ITU 114) – Transmit
Signal Element Timing (TXC) (DCE source) for timing the incoming data.
External – The DTE provides the clock for the transmitted data, and the FrameSaver
unit uses the interchange circuit DA (ITU 113) – Transmit Signal Element Timing (XTXC)
(DTE source) for timing the incoming data.
Invert Transmit Clock
Possible Settings: Auto, Enable, Disable
Default Setting: Auto
Determines whether the clock supplied by the FrameSaver unit on interchange circuit
DB (ITU 114) – Transmit Signal Element Timing (DCE Source) TXC is phase inverted
with respect to the clock used to time the incoming Transmitted Data (TD).
Auto – The port will check the clock supplied by the DCE on TXC on this port. If
necessary, the port will automatically phase invert the clock with respect to the
transmitted data.
Enable – Phase inverts the TXC clock. Use this setting when long cable lengths
between the FrameSaver unit and the DTE are causing data errors.
Disable – Does not phase invert the TXC clock.