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DMD15/DMD15L IBS/IDR Satellite Modem Introduction
TM051 - Rev. 5.8 1-1
Section 1 – Introduction
1.0 Description
The Radyn, Inc. DMD15/DMD15L Satellite Modem (Figure 1-1) offers the best features of a
sophisticated programmable IBS/IDR and Closed Network Modem, at an affordable price.
This versatile equipment package combines unsurpassed performance with numerous user-
friendly Front Panel Programmable Functions. The DMD15/DMD15L provides selectable
functions for different services: Intelsat IDR and IBS, as well as closed networks. All of the
configuration and Monitor and Control (M&C) Functions are available at the Front Panel.
Operating parameters, such as variable data rates, FEC Code Rate, modulation type, IF
frequencies, IBS/IDR Framing and interface type can be readily set and changed at the Front
Panel by earth station operations personnel. Additionally, all functions can be accessed with a
terminal or personal computer via a serial link for complete remote monitoring and control
capability.
The DMD15/DMD15L operates at all standard IBS and IDR Data Rates up to 8.448 Mbps.
Selection of any data rate is provided over the range of 9.6 Kbps to 10 Mbps in 1 bps steps.
For applications requiring system redundancy, the DMD15/DMD15L Modem may be used with the
Radyne , Inc. RCS11 1:1 Redundancy Switch or the RCS20 M:N (N < 9) Redundancy Switch. An
optional Internal Engineering Service Channel Unit is available to provide voice, data, and alarms
for Intelsat IDR applications.
A full range of Industry Standard Interfaces is available for the DMD15/DMD15L. Interface types
are selectable from V.35, RS-232, RS-422/449 and ITU G.703.
Figure 1-1. DMD15/DMD15L Universal Satellite Modem Front Panel
1.1 DMD15/DMD15L Available Options
A wide range of options is available for the DMD15/DMD15L Satellite Modem.
1.1.1 Internal High Stability
The DMD15/DMD15L can be equipped with a 1x10
-7
or better Stability Frequency Reference as
an add-on enhancement.
1.1.2 Reed-Solomon Codec
The DMD15/DMD15L can be equipped with a Reed-Solomon (R-S) Outer Codec with an
interleaver as an optional add-on enhancement. The encoder and decoder are completely
independent and meet the IESS-308/309/310 specification. Once prepped, this option can be
installed in the field by installing five ICs into existing sockets. The DMD15/DMD15L must be
prepped for this option.
Note: Custom Reed-Solomon codes are also available.