Specifications

Installation and Operation Manual Chapter 2 Installation and Setup
SPS-6, SPS-12 Hardware Configuration Information 2-5
The V.24/V.35/RS-530/X.21 interface board can be configured as DCE or DTE by
changing the main jumper. The main jumper consists of multiple jumpers that
must be changed together. Each board is marked DCE  DTE, and the default
setup is in accordance with the client’s order. The V.24 interface board is shown
in
Figure 2-3.
Figure 2-3. SPS-M/V.24 Interface Board
The interface board determines the physical layer configuration of a link.
If the board is set as DCE, a flat cable must connect the link to a terminal. The link
uses the SPS-6/SPS-12 internal clock and the clock parameter must be configured
as internal clock (see the RAD Packet Switching Guide).
If the board is set as DTE, the link receives its clock from an external source and
the clock parameter must be configured as external clock (see the RAD Packet
Switching Guide).
Jumper Setting Procedure
In order to avoid the possibility of electrical shock, always disconnect the
power cable from wall plug before opening the SPS-6/SPS-12.
1. Access the printed circuit board of the SPS-6/SPS-12 by opening the screw
fastening the top cover to the case, and remove top cover.
2. Refer to
Figure 2-2 or Figure 2-3 and identify jumper locations and settings.
Change settings as required.
3. Replace the SPS-6/SPS-12 cover, and fasten its screw. Do not exert excessive
torque while tightening these screws.
Warning