Operating instructions

RCS20 M:N Redundancy Switch Installation
TM056 - Rev. 2.3 2-5
Figure 2-5. DDS20 Rear Panel Interface – Data Switch Module
If either AC line cord remains connected to the RCS20, dangerous AC
voltages will be present within the Switch and the cooling fan will also be
operational. The top cover of the Switch should not be removed unless
one of the power supplies is to be replaced following the Instructions in
Section 4.
Although AC power is not present on the back plane, care must be taken
when Installing or removing a plug-in module since DC voltages will be
present.
The IFS20 and DDS20 receive DC power through the RCS20 interconnection
cable. Therefore, to ensure that no DC power is being applied to the back
plane modules, both of the Switch's AC line cords or the RCS20
interconnection cable must be removed.
2.5 System DIP Switch and Jumper Settings
The RCS20 requires several DIP Switches and jumpers to be configured for proper operation. The
DIP Switches are located on the Digital Data Switches (DDS20) and the jumpers are located on the
optional Reference Distribution Module on the RCU20 (See Figure 2-8).
2.5.1 Data Switch Module DIP Switch Configuration
Two Part Numbers exist for Data Switch Modules on the DDS20; AS/3356 (Figure 2-6a) and
AS/3478 (Figure 2-6b and 2-6c for AS/3478 Rev. A2 forward only).