RAD Data comm RSD-20 operation manual Specifications

RSD-20 OPERATOR'S MANUAL INTRODUCTION

1.3SPECIFICATIONS

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

–56 kbps

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

1.2