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3. Configuration Options
9000-A2-GB31-00 December 2002
3-39
Port Type (9520)
Possible Settings: HSSI, V.35
Default Setting: HSSI
Specifies the port type of the data port.
V.35 – The port is configured as a V.35-compatible DCE. A V.35-compatible DTE may be
connected to the port using a DB25-to-MS34 adapter.
HSSI – The port is configured as a HSSI-compatible DCE. A HSSI-compatible DTE may
be directly connected to the DB25 connector for the port.
Port Rate (9520)
Possible Settings (HSSI): 7456, 11184, 17250, 25875, 44736, 51750
Default Setting (HSSI): 51750
Possible Settings (V.35): 512, 1025, 1537, 2050, 2562, 3074, 3587, 4099, 4611, 5124,
5636, 6149, 6661, 7073, 7685, 8197
Default Setting (V.35): 6149
Selects the clock rate in kbps for the user data port.
Transmit Clock Source (9520)
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 HSSI.
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 (9520)
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).
Display Conditions – This option does not appear when Port Type is set to HSSI.
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.
Table 3-17. HSSI Data Port Physical Interface Options (2 of 3)