RuggedCom RuggedRouter RX1100 - Manual (Page 85)

9. Configuring Frame Relay/PPP And DDS
Revision 1.14.3 85 RX1000/RX1100™
9. Configuring Frame Relay/PPP And DDS
9.1. Introduction
This chapter familiarizes the user with:
• Configuring Frame Relay and PPP Links
• Viewing status and statistics
• Upgrading software
9.1.1. DDS Fundamentals
A Digital Data Services (DDS) line is a North American digital transmission method that operates at
56 Kbps synchronously over an unloaded, 4-Wire metallic-pair circuit.
The DDS line is typically a telephone grade network connection often called the “local loop”. A Data
Terminal Equipment (DTE) device attaches to the line and transmits data to the telephone company
(TELCO), which routes the data to a remote DDS line. A short-haul, synchronous-data line driver
known as a CSU/DSU terminates the line and attaches to the DTE. The DSU part of the DSU/CSU
manages the format of the data signal while the CSU manages electrical levels, isolation and provides
loopback to the TELCO.
RuggedCom DDS port provides an integrated DTE, DSU and CSU.
9.1.1.1. Location Of Interfaces And Labeling
Unlike the Ethernet ports (which are statically located), the location of T1/E1, DDS and ADSL ports
in your router depends upon the number of ports and how they were ordered. Refer to the labeled
hardware image as presented in the Webmin home page.
To make labeling easy to understand, all T1E1, T3, DDS and ADSL ports are assigned a unique port
number that relates to the LEDs on the status panel.
9.1.1.2. LED Designations
The RuggedRouter indicates information about DDS ports on the LED Panel. A pair of LEDs will
indicate traffic and link status of the port. Consult the section “Using The LED Status Panel” to
determine which LEDs correspond to the port.
9.2. DDS Configuration
Figure 9.1. DDS Trunks And Interfaces