Technical Information
4–5
•
Switch 1 – Manufacturing mode –
Should always be in the OFF (up) position
for normal operating mode. Manufacturing mode is only for use in a manufacturing
environment or repair station. Always recycle ac power to the bridge after changing
this switch setting.
•
Switch 2 – Restore default parameters – Normally in the OFF (up) position. Turn-
ing it ON resets all parameters defined by bridge management and replaces them with
the default factory settings. Always recycle ac power to the bridge after changing this
switch setting.
•
Switch 3 – Write access Port 1
*
– When this switch is ON, network stations with
management capabilities can read and write (modify) bridge management parameters
through the specified port. When this switch is OFF, those stations can read but can-
not write bridge management parameters. The firmware checks the state of this
switch whenever a write access to the bridge is attempted through the port.
•
Switch 4 – Write access Port 2
*
(or 1) – Performs the write access function (de-
scribed above) for Port 2.
•
Switch 5 – Write access Port 3 – Performs the write access function for Port 3. It is
applicable only with a 3-port NI(3) module.
•
Switch 6 – Write access Port 4 – Performs the write access function for Port 4. It is
applicable only with a 3-port NI(3) module.
•
Switch 7 – External loopback enable – Should be in the OFF position during nor-
mal bridge operation. Turning it ON allows the self-test diagnostics to perform exter-
nal loopback tests (providing external loopback connectors are in place). It also tests
the optical bypass relay driver on DAS multimode units. Always recycle ac power to
the bridge after changing this switch setting.
•
Switch 8 – AUI/ThinWire – Applicable only with a 1-port NI module to select the
interface connector. Placing the switch in the ON (down) position connects Port 2 to
an AUI interface; placing the switch in the OFF (up) position connects Port 2 to a
ThinWire interface. Changing this switch setting does not require recycling power to
the bridge.
*
In the DECbridge 500, switch 3 controls write access to Port 2 and switch 4 controls
write access to Port 1.
