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2240 Fiber Optic Modem User Manual
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2.1.3.4. CLK/EXT Switch .............................................................................. 24
2.1.4. Signal Ground Strap............................................................................................. 24
2.1.5. SCT Normal/Invert Jumper .................................................................................. 24
2.1.6. EXTRA CLOCK Jumper....................................................................................... 25
2.1.7. Setting Up a Tail Circuit ....................................................................................... 26
2.2. Installation ...................................................................................................... 27
2.2.1. Standalone Modem Installation............................................................................ 27
2.2.2. Rack-Mount Modem Installation........................................................................... 28
2.2.3. Fiber Cable and Connectors ................................................................................ 28
2.2.4. 2202 Modem Shelf Installation............................................................................. 28
2.2.5. Custom Oscillator Installation............................................................................... 29
Chapter 3. Mode and Rate Selection................................................... 31
3.1. Operating Mode, Data Rate Selection............................................................ 31
3.2. External Clock Modes .................................................................................... 33
3.2.1. Sampled External Clock Mode - Mode 0.............................................................. 33
3.2.2. Locked External Clock Mode - Mode 7 ................................................................ 34
3.3. Internal Clock Modes - Modes 1, 2, 3, 4......................................................... 34
3.3.1. Standard Internal Clock Rates (Groups 1, 2 and 3) ............................................. 35
3.3.2. Custom Internal Clock Rates (Group 4) ............................................................... 35
3.4. Slave Clock Mode - Mode 5 ........................................................................... 37
3.4.1. Loopback Clock for Slave Mode .......................................................................... 37
3.5. Asynchronous Mode - Mode 6 ....................................................................... 37
3.6. Consideration of Propagation Delays............................................................. 38
3.7. Internal Clock Option Switches ...................................................................... 39
3.7.1. TBL/NORM Switch ............................................................................................... 39
3.7.2. CLK/EXT Switch................................................................................................... 39
Chapter 4. Data Interfaces.................................................................... 41
