When connecting two Model 1035s, it is necessary to use a twisted pair “crossover” cable. The diagram below shows how a crossover cable should be constructed for an environment where both Model 1035s use a 6-wire RJ-11 connector. Similar logic should be followed when using RJ-45 connectors or a combination of the two.

SIGNAL

PIN#

COLOR

COLOR

PIN#

SIGNAL

GND

1

Blue

White

6

GND

RCV

2

Yellow

Red

4

XMT

XMT

3

Green

Black

5

RCV

XMT

4

Red

Yellow

2

RCV

RCV

5

Black

Green

3

XMT

GND

6

White

Blue

1

GND

Connection to ground is optional

Standard color codes—yours may be different

4.2 CONNECTION TO THE RS-232 AND V. 35 INTERFACES

Once you have connected the twisted pair wires correctly, simply plug the Model 1035 directly into the DB-25 port of the RS-232 or V.35 device. After doing so, remember to insert and tighten the two captive connector screws.

4.2.1 CONNECTION TO A “DTE” DEVICE

The Model 1035 is wired as a DCE, and therefore “wants” to plug into a DTE such as a terminal, PC or host. A direct connection to the RS-232 or V.35 DTE port is most desirable. If you must use a cable to connect the Model 1035 to the DTE port, make sure it is a straight through cable of the shortest possible length—we recommend 6 feet or less.

 

 

 

 

 

1

- Blue

 

 

 

 

 

1

- Blue

 

 

 

2

- Orange

 

 

 

2

- Yellow

 

 

 

3

- Black

 

 

 

3

- Green

 

 

 

4

- Red

 

 

 

4

- Red

 

 

 

5

- Green

 

 

 

5

- Black

 

 

 

6

- Yellow

 

 

 

6

- White

 

 

 

7

- Brown

 

 

 

 

 

 

 

 

8

- Slate

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5. Standard AT&T color codes

4.2.2 CONNECTION TO AN RS-232 “DCE” DEVICE

Since the Model 1035 is wired as a DCE, you cannot connect it directly to another DCE such as a modem, multiplexer or printer. If you need to connect the Model 1035 to another RS-232 DCE device, you must use a null modem cable wired according to diagram below. We recommend a cable of the shortest possible length, preferably 6 feet or less.

Connection to Model 1035

Connection to DCE Device

DB-25 Pin No.

DB-25 Pin No.

1

1

2

3

3

2

4

8

8

4

6

20

20

6

17

24

24

17

7

7

Note: When connected to another DCE device, the Model 1035 should be configured for “external clock” (see Section 3.3).

4.2.3CONNECTION TO A V.35 “DCE” DEVICE

For details on connecting the Model 1035 to a V.35 DCE, please contact Patton Electronics Technical Support at (301) 975-1007.

9

10

Page 6
Image 6
Patton electronic user manual Signal PIN# Color ‡, Connection to the RS-232 and V Interfaces, Connection to a DTE Device