Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.apo.nmsu.edu/Telescopes/RJ11_Serial/Cables/OctopusForMuxHWFC.html
Дата изменения: Fri Dec 1 04:22:31 2000
Дата индексирования: Sun Apr 10 03:59:29 2016
Кодировка:
Поисковые слова: п п п п п п п п п п п п п п п
Octopus for Fiber Mux HWFC

Octopus Cable for Canoga-Perkins Fiber Optic Mux

With Hardware Flow Control

Introduction

This custom-made "octopus" cable connects one Canoga-Perkins CMX-808 fiber-optic RS-232 multiplexer to a patch panel or 8-port harmonica with 6-wire 6-position RJ11 jacks. The patch panel or harmonica must be USOC-wired and have a male Telco connector, since this cable has a female Telco connector.

The RJ11 jacks will be wired with hardware flow control. If you can do without hardware flow control, you can gain ports by using a different octopus cable that does not support hardware flow control and uses those channels for additional ports. If you want a mix, you can use one of these octopus cables for four ports (leaving four ports on that harmonica unconnected) and a non-hardware-flow-control octopus cable for eight ports. More complex mixes require custom cabling because each octopus cable takes up an entire telco cable.

Specifications

Each octopus consists of:

Each leg is two feet (2') long unless otherwise specified. The wiring is as follows. Use of twisted pair wire is optional, but if it is used, it must be used as shown in the table.

If solder-type DB25 connectors are used, the soldered pins must be protected with heat-shrink tubing (or some other insulation).

DB25
Pin

Female Telco Connector Pin

Leg #1

Leg #2

Leg #3

Leg #4

Leg #5

Leg #6

Leg #7

Leg #8

twisted
pair

3

27

30

33

36

39

42

45

48

7

1

4

7

10

13

16

19

22

twisted
pair

7

26

29

32

35

38

41

44

47

2

2

5

8

11

14

17

20

23

twisted
pair

6

28

31

34

37

40

43

46

49

20

3

6

9

12

15

18

21

24

Derivation

The octopus wiring is derived from the table below, as follows:


   

      
         

      		
      
         
DB25

         Pin

      		
      
         
RJ11

         Pin

      		
      
         
Signal

      		
      
         
Telco Connector Pin

      		
   

   

         
Leg #1

      		
      
         
Leg #2

      		
      
         
Leg #3

      		
   

   

      
         
twisted

         pair

      		
      
         
3

      		
      
         
2

      		
      
         
Tx

      		
      
         
27

      		
      
         
30

      		
      
         
...

      		
   

   

         
7

      		
      
         
3

      		
      
         
Tx Gnd

      		
      
         
1

      		
      
         
4

      		
      
         
...

      		
   

   

      
         
twisted

         pair

      		
      
         
7

      		
      
         
4

      		
      
         
Rx Gnd

      		
      
         
26

      		
      
         
29

      		
      
         
...

      		
   

   

         
2

      		
      
         
5

      		
      
         
Rx

      		
      
         
2

      		
      
         
5

      		
      
         
...

      		
   

   

      
         
twisted

         pair

      		
      
         
6

      		
      
         
1

      		
      
         
Tx Flow

      		
      
         
28

      		
      
         
31

      		
      
         
...

      		
   

   

         
20

      		
      
         
6

      		
      
         
Rx Flow

      		
      
         
3

      		
      
         
6

      		
      
         
...