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9–1
Chapter 9. OPEN NETWORK
OPERATIONS
9.1 Introduction
This section summarizes the functionality and specifications of the various Open
Network operating modes (IDR, IBS and Drop and Insert).
9.2 IBS
Primary Data Rates Supported
G.703 1544, 2048, 6312 and 8448 kbps SD, RD
EIA-422, V.35, LVDS N x 64 kbps SD, RD (up to 8448 kbps)
ADPCM Audio
(2 Channels)
64 kbps only, full duplex
Engineering Service Channel
Earth Station-to-Earth
Station Channel
EIA-232 data synchronous at 1/480 of the primary data
EIA-232 data asynchronous at 1/2000 of the primary data
High Rate Engineering Service Channel
ESC Data Interface Type
Async – configurable async character format, EIA-232 at up
to 1/20
th
of primary data rate
ESC Data Rate Example: 2400 baud at 64 kbps
Faults and Alarms
Satellite Backward Alarm 1 (per IESS-309)
Receive BWA Output Enabled onto terrestrial secondary alarm