Cisco VG224 Voice Gateway Hardware Installation Guide
Cable Specifications and Information
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Cable Specifications and Information

Table Of Contents

Cable Specifications and Information

Console and Auxiliary Port Cables and Pinouts

Identifying a Rollover Cable

Console Port to PC

Console Port to ASCII Terminal

Auxiliary Port to Modem

Alternative Connections to Terminal and Modem

Fast Ethernet Port Pinouts (RJ-45)

Analog Voice Multiport Pinouts (RJ-21X/CA21A)

EIA/TIA-232 Connections

EIA/TIA-449 Connections

V.35 Connections

X.21 Connections

EIA/TIA-530 Connections


Cable Specifications and Information


This appendix provides the connector and pinout information you need for making or purchasing cables used with Cisco VG224 voice gateway. To order cables from Cisco, see the "Obtaining Technical Assistance" section on page xvi. This appendix contains the following sections:

Console and Auxiliary Port Cables and Pinouts

Fast Ethernet Port Pinouts (RJ-45)

Analog Voice Multiport Pinouts (RJ-21X/CA21A)

The following list shows you which table to see for pinout information:


Console and Auxiliary Port Cables and Pinouts

Your Cisco VG224 voice gateway comes with the cable and adapters you need to connect a PC, an ASCII terminal, or a modem to your Cisco VG224 voice gateway. The cable kit includes:

RJ-45-to-RJ-45 rollover cable

RJ-45-to-DB-9 adapter cable for console connection

RJ-45-to-DB-25 adapter cable for modem connection

The following illustrations and tables provide cable pinout information:

Console port to a PC—See Table A-1 and Table A-4

Console port to an ASCII terminal—See Table A-2 and Table A-4

Auxiliary port to a modem—See Table A-3 and Table A-4

The console port is configured as data communications equipment (DCE); the auxiliary port is configured as data terminal equipment (DTE). Both are asynchronous serial ports and use RJ-45 connectors.

Identifying a Rollover Cable

You can identify a rollover cable by holding the plugs side by side, with the tab at the back and comparing the modular plugs at the two ends of the cable. The wire connected to the pin on the outside of the left plug should be the same color as the wire connected to the pin on the outside of the right plug. (See Figure A-1.)

If your cable comes from Cisco Systems, pin 1 is white on one plug, and pin 8 is white on the opposite plug. (A rollover cable reverses the wire connections at the opposite ends: 1 to 8, 2 to 7, 3 to 6, 4 to 5, 5 to 4, 6 to 3, 7 to 2, and 8 to 1.)

Figure A-1 Identifying a Rollover Cable

Console Port to PC

Figure A-2 shows the RJ-45-to-RJ-45 rollover cable assembly and the RJ-45-to-DB-9 female DTE adapter (labeled TERMINAL); Table A-1 lists the pinouts.

Figure A-2 Console Port to PC—Cable and Adapter

Table A-1 Console Port to PC—Cable Pinouts (RJ-45 to DB-9) 

Console Port
(DCE, RJ-45)
RJ-45-to-RJ-45
Rollover Cable
RJ-45-to-DB-9
Adapter "TERMINAL"
PC Port
(DTE, DB-9)
Signal
RJ-45 Pin
RJ-45 Pin
RJ-45 Pin
DB-9 Pin
Signal

RTS

11

8

8

8

CTS

DTR

2

7

7

6

DSR

TxD

3

6

6

2

RxD

GND

4

5

5

5

GND

GND

5

4

4

5

GND

RxD

6

3

3

3

TxD

DSR

7

2

2

4

DTR

CTS

81

1

1

7

RTS

1 Pin 1 is connected to pin 8 inside the Cisco VG224 voice gateway.


Console Port to ASCII Terminal

Figure A-3 shows the RJ-45-to-RJ-45 rollover cable assembly and the RJ-45-to-DB-25 female DTE adapter (labeled TERMINAL); Table A-2 lists the pinouts.

Figure A-3 Console Port to ASCII Terminal—Cable and Adapter

Table A-2 Console Port to ASCII Terminal—Cable Pinouts (RJ-45 to DB-25) 

Console Port
(DCE, RJ-45)
RJ-45-to-RJ-45
Rollover Cable
RJ-45-to-DB-25
Adapter "TERMINAL"
Terminal Port
(DTE, DB-25)
Signal
RJ-45 Pin
RJ-45 Pin
RJ-45 Pin
DB-25 Pin
Signal

RTS

11

8

8

5

CTS

DTR

2

7

7

6

DSR

TxD

3

6

6

3

RxD

GND

4

5

5

7

GND

GND

5

4

4

7

GND

RxD

6

3

3

2

TxD

DSR

7

2

2

20

DTR

CTS

81

1

1

4

RTS

1 Pin 1 is connected to pin 8 inside the Cisco VG224 voice gateway.


Auxiliary Port to Modem

Figure A-4 shows the RJ-45-to-RJ-45 rollover cable assembly and the RJ-45-to-DB-25 male DCE adapter (labeled MODEM); Table A-3 lists the pinouts.

Figure A-4 Auxiliary Port to Modem—Cable and Adapter

Table A-3 Auxiliary Port to Modem—Cable Pinouts (RJ-45 to DB-25)

Auxiliary Port
(DTE, RJ-45)
RJ-45-to-RJ-45
Rollover Cable
RJ-45-to-DB-25
Adapter "MODEM"
Modem Port
(DCE, DB-25)
Signal
RJ-45 Pin
RJ-45 Pin
RJ-45 Pin
DB-25 Pin
Signal

RTS

1

8

8

4

RTS

DTR

2

7

7

20

DTR

TxD

3

6

6

2

TxD

GND

4

5

5

7

GND

GND

5

4

4

7

GND

RxD

6

3

3

3

RxD

DSR

7

2

2

8

DCD

CTS

8

1

1

5

CTS


Alternative Connections to Terminal and Modem

Your Cisco VG224 voice gateway ships with an RJ-45-to-RJ-45 rollover cable and two adapters for connection to a PC, a terminal, or a modem. If you want to use an RJ-45 straight-through cable or other adapters, see Table A-4 for usable cable and adapter combinations.

Table A-4 Alternative Terminal and Modem Connections

Cisco VG224 Port Connection
RJ-45 Cable Type
Adapter

Console port to PC

Straight-through

DCE, DB-9 female

Auxiliary port to modem

Rollover1

DCE2 , DB-25, male

 

Straight-through

DTE2, DB-25, male

1 An octal cable or RJ-45 breakout cable is equivalent to a rollover cable.

2 Modify the DB-25 adapter by removing the wire in pin 6 and placing it in the pin 8 position.


Fast Ethernet Port Pinouts (RJ-45)

Figure A-5 shows the RJ-45 connector wiring for the Fast Ethernet cable; Figure A-5 lists the pinouts.


Note Pinout shown is for category 3, 4, or 5 10/100BASE-T connection to an Fast Ethernet switch.


Figure A-5 RJ-45 Connector Wiring

Table A-5 Fast Ethernet Port Pinouts (RJ-45) 

Pin 1
Signal

1

TX+

2

TX-

3

RX+

4

-

5

-

6

RX-

7

-

8

-

1 Any pin not referenced is not connected.


Analog Voice Multiport Pinouts (RJ-21X/CA21A)

Figure A-6 shows the RJ-21 connector wiring for the cable used for the multiport analog voice interface.

Figure A-6 RJ-21 Connector Wiring

Table A-6 lists the pinouts for the RJ-21 connector.

Table A-6 RJ-21 Connector Pinouts

Port Number
Connector Pin Number
Signal
Port Number
Connector Pin Number
Signal

1

1
26

Ring
Tip

13

13
38

Ring
Tip

2

2
27

Ring
Tip

14

14
39

Ring
Tip

3

3
28

Ring
Tip

15

15
40

Ring
Tip

4

4
29

Ring
Tip

16

16
41

Ring
Tip

5

5
30

Ring
Tip

17

17
42

Ring
Tip

6

6
31

Ring
Tip

18

18
43

Ring
Tip

7

7
32

Ring
Tip

19

19
44

Ring
Tip

8

8
33

Ring
Tip

20

20
45

Ring
Tip

9

9
34

Ring
Tip

21

21
46

Ring
Tip

10

10
35

Ring
Tip

22

22
47

Ring
Tip

11

11
36

Ring
Tip

23

23
48

Ring
Tip

12

12
37

Ring
Tip

24

24
49

Ring
Tip

25, 50, 51, 52

GND


EIA/TIA-232 Connections

The EIA/TIA-232 standard supports unbalanced circuits at signal speeds up to 64 kbps.

For connection to a Cisco VG224 voice gateway serial port, use the EIA/TIA-232 serial transition cable with the Cisco 12-in-1 connector on one end and a DB-25 connector (as shown in Figure A-7) on the other. The DB-25 connector can be male for DTE or female for DCE. To order a cable, see the "Obtaining Technical Assistance" section on page xvi.

Figure A-7 EIA/TIA-232 Serial Transition Cable Connectors

EIA/TIA-449 Connections

The EIA/TIA-449 standard, which supports balanced and unbalanced transmissions, is a faster (up to 2 Mbps) version of the EIA/TIA-232 standard that provides more functions and supports transmission over greater distances.

The EIA/TIA-449 standard was intended to replace the EIA/TIA-232 standard. However, this standard was not widely adopted because of the large installed base of DB-25 hardware. Also, the larger size of the 37-pin EIA/TIA-449 connectors limited the number of connections possible (fewer than are possible with the smaller, 25-pin EIA/TIA-232 connector).

To make a connection to a Cisco VG224 voice gateway serial port, use the EIA/TIA-449 serial transition cable with the Cisco 12-in-1 connector on one end and a DB-37 connector (as shown in Figure A-8) on the other. The DB-37 connector can be male for DTE or female for DCE. To order a cable, see the "Obtaining Technical Assistance" section on page xvi.

Figure A-8 EIA/TIA-449 Serial Transition Cable Connectors

V.35 Connections

The V.35 standard is recommended for speeds up to 48 kbps, although in practice it is used successfully at 4 Mbps. The Cisco VG224 voice gateway supports speeds up to 2.048 Mbps.

Use the V.35 serial transition cable (not included) with the Cisco 12-in-1 connector on one end and a standard 34-pin Winchester-type connector (as shown in Figure A-9) on the other. The 34-pin Winchester-type connector can be male for DTE or female for DCE. To order a cable, see the "Obtaining Technical Assistance" section on page xvi.

Figure A-9 V.35 Serial Transition Cable Connectors

X.21 Connections

The X.21 connector uses a 15-pin connector for balanced circuits and is commonly used in the United Kingdom to connect to the public data network. X.21 relocates some of the logic functions to the DTE and DCE interfaces and, as a result, requires fewer circuits and a smaller connector than EIA/TIA-232.

Use the X.21 serial transition cable (not included) with the Cisco 12-in-1 connector on one end and a DB-15 connector (as shown in Figure A-10) on the other. The DB-15 connector can be male for DTE or female for DCE. To order a cable, see the "Obtaining Technical Assistance" section on page xvi.

Figure A-10 X.21 Serial Transition Cable Connectors

EIA/TIA-530 Connections

The EIA/TIA-530 standard, which supports balanced transmission, provides the increased functionality, speed, and distance of EIA/TIA-449 on the smaller, DB-25 connector used for EIA/TIA-232. Like EIA/TIA-449, EIA/TIA-530 refers to the electrical specifications of EIA/TIA-422 and EIA/TIA-423. Although the specification recommends a maximum speed of 2 Mbps, EIA/TIA-530 is used successfully at 4 Mbps or faster speeds over short distances. Cisco VG224 voice gateway supports speeds up to 2.048 Mbps.

Use the EIA/TIA-530 serial transition cable (not included) with the Cisco 12-in-1 connector on one end and a DB-25 connector (as shown in Figure A-11) on the other. The DB-25 connector can be male for DTE or female for DCE. To order a cable, see the "Obtaining Technical Assistance" section on page xvi.

Figure A-11 EIA/TIA-530 Serial Transition Cable Connectors