Specifications

This appendix provides cable and technical specifications for the Catalyst 4912G switch.

Console Port

The console port is an RJ-45 receptacle. The Request To Send (RTS) signal tracks the state of the Clear To Send (CTS) input. Table A-1 lists the console port pinouts.

Pin	Signal	Direction	Description
1	RTS	output	request to send
2	DTR	output	data terminal ready
3	TXD	output	transmit data
4	GND
5	GND
6	RXD	input	receive data
7	DSR	input	data set ready
8	CTS	input	clear to send

Table A-1: Console Port Pinouts

Pin Signal Direction Description

1

RTS

output

request to send

2

DTR

output

data terminal ready

3

TXD

output

transmit data

4

GND

5

GND

6

RXD

input

receive data

7

DSR

input

data set ready

8

CTS

input

clear to send

10BaseT Management Port

The 10BaseT port is an RJ-45 receptacle with a Link Status LED. Table A-2 lists the 10BaseT port pinouts.

Pin	Signal	Direction	Description
1	RXDP	input	receive data
2	RXDN	input	receive data
3	TXDP	output	transmit data
4	unused
5	unused
6	TXDN	output	transmit data
7	unused
8	unused

Table A-2: 10BaseT Port Pinouts

Pin Signal Direction Description

1

RXDP

input

receive data

2

RXDN

input

receive data

3

TXDP

output

transmit data

4

unused

5

unused

6

TXDN

output

transmit data

7

unused

8

unused

Catalyst 4912G Switch Specifications

Catalyst 4912G switch specifications are provided in Table A-3.

Table A-3: Catalyst 4912G Switch Specifications
Item Specification

Environmental

Temperature
ambient operating

32°F (0°C) to 104°F (40°C)

Temperature
ambient nonoperating and storage

-40 to 167°F (-40 to 75°C)

Humidity (RH), ambient (noncondensing) operating

10% to 90%

Humidity (RH), ambient (noncondensing) nonoperating and storage

5% to 95%

Altitude
operating and nonoperating

-60 to 4000 m

Switching Components

Backplane

12 Gbps full duplex

Microprocessor

150-MHz R5000 RISC-Y2K Compliant

Memory

64-MB SDRAM, 12-MB Flash (onboard), 512-KB NVRAM,
8-MB synchronous SRAM, 256 Bytes serial EEROM

Physical Characteristics

Dimensions (H x W x D)

2.625 x 17.5 x 15 in. (6.6 x 44 x 38 cm)

Weight

13 lb (5.9 kg)

AC Power

Power supply output

120W

System power dissipation

189W

AC-input

2.5A maximum @ 100 VAC
1.3A maximum @ 240VAC

AC frequency

50 to 60 Hz

KVA rating

0.20 KVA

Airflow

Right side in, left side out

Standards Compliance

Compliance

CE Marking

Safety

UL¹ 1950, CSA²-C22.2 No. 950, EN³60950, IEC⁴ 950, TS⁵ 001, AS/NZS⁶ 3260

EMI⁷

FCC⁸ Class A (CFR⁹ 47, part 15), ICES¹⁰-003 Class A, EN55022 Class A, CISPR22 Class A, AS/NZS 3548 Class A, and VCCI¹¹ Class A with FTP¹² cables

EN55022 Class B, CISPR22 Class B, AS/NZS 3548 Class B, and VCCI Class B with FTP cables

¹UL = Underwriters Laboratory.
²CSA = Canadian Standards Association.
³EN = European Norm.
⁴IEC = International Electrotechnical Commission.
⁵TS = Technical Standard.
⁶AS/NZS = Australian/New Zealand Standard.
⁷EMI = electromagnetic interference.
⁸FCC = Federal Communications Commission.
⁹CFR = Code of Federal Regulations.
¹⁰ICES = International Commerce Exchange Systems.
¹¹VCCI = Voluntary Control Council for Information Technology Equipment.
¹²FTP = foil twisted-pair.

Item	Specification
Environmental
Temperature ambient operating	32°F (0°C) to 104°F (40°C)
Temperature ambient nonoperating and storage	-40 to 167°F (-40 to 75°C)
Humidity (RH), ambient (noncondensing) operating	10% to 90%
Humidity (RH), ambient (noncondensing) nonoperating and storage	5% to 95%
Altitude operating and nonoperating	-60 to 4000 m
Switching Components
Backplane	12 Gbps full duplex
Microprocessor	150-MHz R5000 RISC-Y2K Compliant
Memory	64-MB SDRAM, 12-MB Flash (onboard), 512-KB NVRAM, 8-MB synchronous SRAM, 256 Bytes serial EEROM
Physical Characteristics
Dimensions (H x W x D)	2.625 x 17.5 x 15 in. (6.6 x 44 x 38 cm)
Weight	13 lb (5.9 kg)
AC Power
Power supply output	120W
System power dissipation	189W
AC-input	2.5A maximum @ 100 VAC 1.3A maximum @ 240VAC
AC frequency	50 to 60 Hz
KVA rating	0.20 KVA
Airflow	Right side in, left side out
Standards Compliance
Compliance	CE Marking
Safety	UL¹ 1950, CSA²-C22.2 No. 950, EN³60950, IEC⁴ 950, TS⁵ 001, AS/NZS⁶ 3260
EMI⁷	FCC⁸ Class A (CFR⁹ 47, part 15), ICES¹⁰-003 Class A, EN55022 Class A, CISPR22 Class A, AS/NZS 3548 Class A, and VCCI¹¹ Class A with FTP¹² cables EN55022 Class B, CISPR22 Class B, AS/NZS 3548 Class B, and VCCI Class B with FTP cables

Table of Contents

Specifications

Specifications

Console Port

10BaseT Management Port

Catalyst 4912G Switch Specifications