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1.3 SPECIFICATIONS
Number of Sub-channels
Four
Channel Configuration
Lowest priority: Sub-channel 1
Highest priority: Sub-channel 4
Sub-channel Selection
Strap-selectable to:
Control signal RTS/DCD (V.35) or CONT/IND (X.21) ON
Data transitions
Sub-channel Deselection
RTS/DCD (V.35) or CONT/IND (X.21) OFF (in control contention)
16 bits of idle data (in data contention)
Sub-channel Disabling
Manual: Via front panel switches
Automatic: If sub-channel stays connected for more than a pre-set time period
(32.4, 4, 0.5 sec for 64 or 48 kbps; 36.8, 4.7 or 0.6 for 56 kbps)
Transmit Clock Source
– Internal
– External derived from main channel
– External derived from sub-channel 1
Data Rates
Synchronous:
Internal Clock:
– Selectable 48, 64 kbps for 64 kbps option
–56kbps
External Clock:
– Derived from main channel (modem in internal mode)
– Derived from sub-channel 1 (up to 128 kbps)
Input and Output Interface
V.35 or X.21
Connectors
– Five 34-pin V.35, female,
– Five DB-15 X.21, female
Controls
Four manual sub-channel DISABLE switches, one per sub-channel;
Push-button switches
RSD-20 OPERATOR'S MANUAL INTRODUCTION
1.2