Comtech EF Data SDM-2020 - Manual (Page 168)

SDM-2020 Satellite Demodulator Revision 4
G.703 Data Interface MN/SDM2020D.IOM
11–2
• ITU -T G.704, Synchronous Frame Structures Used At Primary And Secondary
Hierarchical Levels
• ITU-T G.742, General Considerations On Second Order Multiplex Equipment
• ITU-T G.743, Second Order Digital Multiplex Equipment Operating At
6312 kbps And Using Positive Justification
• ITU-T G.745, Second Order Digital Multiplex Equipment Operating At
8448 kbps And Using Positive/Zero/Negative Justification
• ITU-T G.747, Second Order Digital Multiplex Equipment Operating At
6312 kbps And Multiplexing Three Tributaries At 2048 kbps
• ITU-T G.751, Digital Multiplex Equipments Operating At The Third Order Bit
Rate Of 34,368 kbps And The Fourth Order Bit Rate Of 139,264 kbps And Using
Positive Justification
• ITU-T G.752, Characteristics of Digital Multiplex Equipments Based On A
Second Order Bit Rate Of 6312 kbps And Using Positive Justification
• ITU-T G.753, Third Order Digital Multiplex Equipment Operating At
34,368 kbps And Using Positive/Zero/Negative Justification
• ITU-T G.823, The Control Of Jitter And Wander Within Digital Networks Which
Are Based On The 2048 kbps Hierarchy
• ITU-T G.824, The Control Of Jitter And Wander Within Digital Networks Which
Are Based On The 1544 kbps Hierarchy
• Bellcore SONET STS-1
11.1.2 Description
The G.703 data interface is a plug-in module that inserts into the rear of the SDM-2020
Satellite Demodulator chassis.
It provides physical and electrical connection between
terrestrial data equipment and the internal circuitry of the demodulator. The interface is
designed for full duplex capability and is automatically configured for simplex RX
operation.
The interface operates at the digital hierarchy Mbps of:
• 1.544
• 2.048
• 6.312
• 8.448
• 32.064
• 34.368