INSTALLING THE TRFOT-3
Page 3-2
Table 3-1 provides a quick reference for the switch settings for Station,
Lobe Concentrator/Trunk Coupling Unit (TCU), Ring In (RI), and
Ring Out (RO) applications. A description of each switch is also listed
below.
Switch A
This switch selects Station/RI or Lobe/RO applications for the
TRFOT-3’s copper connector. Select ON to attach the TRFOT-3’s
copper connector to a Station adapter or Ring In port. Select OFF to
connect the copper connector to a concentrator lobe port or Ring Out
port.
Switch B
This switch selects RI/RO or Station/Lobe applications for the
TRFOT-3. Select ON for RI/RO applications. Select OFF for Station/
Lobe applications.
Switch C
This switch enables/disables the phantom drive for RI/RO applications
with other Cabletron products. Select ON to disable the phantom
drive. Select OFF to enable the phantom drive.
Switch D
This switch selects modes on the TRFOT-3’s fiber optic connector.
Select ON to attach the TRFOT-3’s fiber optic connector to a Cabletron
fiber RI/RO port, for example the TRRMIM-A/2A/4A. Select OFF to
attach the fiber optic connector to an IEEE 802.5J compatible RI/RO
Table 3-1. Switch Settings
Switch
Station
Lobe
(TCU)
Ring In
Ring Out
A
On
Off
On
Off
B
Off
Off
On
On
C
Off
Off
On - Disables phantom drive.
Off - Enables phantom drive (for
use with Cabletron propri-
etary devices only).
D
Off
Off
On - Cabletron proprietary devices.
Off - 802.5J compatible device.
