Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide
Product Overview
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Product Overview

Table Of Contents

Product Overview

Features

Physical and Environmental Specifications

Fan Tray

Catalyst 4948E Fan Tray (WS-X4993=)

Catalyst 4948E-F Fan Tray (WS-X4993-F=)

Front Panel LEDs


Product Overview


Revised: January 4, 2012

Both the Catalyst 4948E switch and the Catalyst 4948E-F switch are 1-RU, horizontal, fixed-configuration chassis with 48 10/100/1000 downlink ports and 4 1-GB or 10-GB uplink ports. Both switches have one removable fan tray and support redundant power supplies. The primary difference between the two chassis is that the air flow in the Catalyst 4948E goes from the front of the chassis to the rear of the chassis while the air flow in the Catalyst 4948E-F goes from the rear of the chassis to the front of the chassis. Figure 1-1 shows the front view of both chassis with the major features identified and Figure 1-2 shows the rear view of both chassis with the major features identified.


Note The fan trays and the power supplies are not interchangeable between the Catalyst 4948E and the Catalyst 4948E-F switch chassis.



Tip For additional information about the Cisco Catalyst 4948E and the Catalyst 4948E-F switches (including configuration examples and troubleshooting information), see the documents listed on this page:

http://www.cisco.com/en/US/products/ps6021/tsd_products_support_series_home.html


Figure 1-1 Catalyst 4948E and Catalyst 4948E-F Switches—Front View of Chassis (Catalyst 4948E Switch Shown)

1

48 downlink ports

4

Status LEDs

2

4 uplink ports

5

Console port

3

Management port

   


Note The orientation of the Cisco logo shown in Figure 1-1 identifies the chassis as a Catalyst 4948E switch. The Cisco logo that appears on the Catalyst 4948E-F chassis top cover is rotated 180 degrees. Additional labels are placed on the Catalyst 4948E-F top cover to denote the direction of the airflow through the chassis.


Figure 1-2 Catalyst 4948E and Catalyst 4948E-F Switches—Rear View of Chassis

1

Power supply 1 (primary)

3

Power supply 2 (redundant)

2

Fan tray

   

This chapter describes the Catalyst 4948E and Catalyst 4948E-F switches and includes these sections:

Features

Physical and Environmental Specifications

Fan Tray

Front Panel LEDs

Features

Table 1-1 lists the features of the Catalyst 4948E and the Catalyst 4948E-F switch chassis.

Table 1-1 Catalyst 4948E and Catalyst 4948E-F Switch Features 

Feature
Description

Chassis
(both chassis)

1-RU, 48 10/100/1000 ports plus 4 1-GB/10-GB ports, fixed configuration switch with redundant power supplies

Uplink ports
(both chassis)

The chassis has 4 1-GB or 10-GB uplink ports. An SFP or SFP+ transceiver must be installed in the chassis port socket for the port to operate. Cable type and recommended cabling distance for each port is determined by the type of SFP or SFP+ transceiver installed in the uplink port. A bicolor port link status LED is associated with each uplink port. LED colors indicate the following status:

Green—The link is established and operational.

Amber—The port is disabled.

Blinking amber—The system has detected a fault with the link.

Off—No link is established or the transceiver is not installed in the port socket.

See "Transceiver, Chassis Connectors, and Cable and Adapter Specifications" for supported SFP and SFP+ transceiver descriptions, specifications, and cabling distances.

Downlink ports
(both chassis)

The chassis has 48 10/100/1000BASE autonegotiating-capable downlink ports. Each port has an RJ-45 connector. A bicolor port link status LED is associated with each port. LED colors indicate the following status:

Green—The link is established and operational.

Amber—The port is disabled.

Blinking amber—The system has detected a fault with the link.

Off—No link is established or no network interface cable is installed.

Console port
(both chassis)

A console serial port (RJ-45) is provided for switch management using standard console equipment. Additional information including a connector pinout table is provided in "Transceiver, Chassis Connectors, and Cable and Adapter Specifications"for the console port.

Note A console cable is not provided in the accessory kit. It can be ordered as an option.

Ethernet management port
(both chassis)

The Catalyst 4948E switch provides a 10/100/1000 RJ-45 port Ethernet Management port that can be used to manage the switch through an Ethernet network. This port can also be used to download software to the switch or transfer files to remote servers for analysis or backup storage.

The typical connection to the Management Ethernet port uses an Ethernet cable with RJ-45 connectors at each end. The other end of the cable typically connects to an Ethernet switch, hub, or router that provides connectivity between the multishelf system and networks from which system management is desired. "Transceiver, Chassis Connectors, and Cable and Adapter Specifications" contains additional information for the Ethernet management port including a connector pinout table.

RESET switch
(both chassis)

Resets and restarts the switch.

The switch is recessed on chassis front panel and requires a pointed object to access it.

Fan tray

Catalyst 4948E chassis

The Catalyst 4948E chassis supports one hot-swappable fan tray (part number WS-X4993=).

Note The fan trays are not interchangeable between the Catalyst 4948E and the Catalyst 4948E-F chassis.

The fan tray has four variable-speed 12 VDC fans.

The fan tray installs in the rear of the chassis between the two power supplies.

The fan tray for the Catalyst 4948E (WS-X4993=) is color-coded dark grey.

A redundant pair of thermal sensors are positioned near the air inlet (front of the chassis) to monitor the ambient air temperature and control the fan tray fan speed.

The airflow in the Catalyst 4948E chassis is from front to back.

The chassis has a FAN LED (located on the chassis front panel) that provides fan tray status.

Red—One or more individual fans in the fan tray have failed.

Green—All fans in the fan tray are operating normally.

Catalyst 4948E-F chassis

The Catalyst 4948E-F chassis supports one hot-swappable fan tray (part number WS-X4993-F=).

Note The fan trays are not interchangeable between the Catalyst 4948E and the Catalyst 4948E-F chassis.

The fan tray has four variable-speed 12 VDC fans.

The fan tray installs in the rear of the chassis between the two power supplies.

The fan tray for the Catalyst 4948E-F is color-coded blue.

A redundant pair of thermal sensors are positioned near the air inlet (rear of the chassis) to monitor the ambient air temperature and control the fan tray fan speed.

The airflow in the Catalyst 4948E-F chassis is from back to front.

The chassis has a FAN LED (located on the chassis front panel) that provides fan tray status.

Red—One or more individual fans in the fan tray have failed.

Green—All fans in the fan tray are operating normally.

Power supplies

Catalyst 4948E

Supports one or two power supplies. The following power supplies are supported:

PWR-C49E-300AC-R (300 W AC-input power supply).

PWR-C49-300DC (300 W DC-input power supply).

Note The power supplies are not interchangeable between the Catalyst 4948E and the Catalyst 4948E-F switch chassis.

The front panels on both of the power supplies for the Catalyst 4948E are color-coded dark grey.

Note The 300 W AC-input power supply requires single-phase source AC. Source AC can be out of phase between multiple power supplies because all AC power supply inputs are isolated.

Note "Power Supply Specifications" contains additional information on both of the power supplies.

Note If the redundant power supply is not installed, the empty power supply bay should be covered using the blank power supply cover (p/n WS-X4994). The blank power supply cover is color-coded dark grey.

Catalyst 4948E-F

Supports one or two power supplies. The following power supplies are supported:

PWR-C49E-300AC-F (300 W AC-input power supply, reversed air flow).

The front panel on the power supply for the Catalyst 4948E-F is color-coded blue.

Note The 300 W AC-input power supply requires single-phase source AC. Source AC can be out of phase between multiple power supplies because all AC power supply inputs are isolated.

Note "Power Supply Specifications" contains additional information on both of the power supplies.

Note If the redundant power supply is not installed, the empty power supply bay should be covered using the blank power supply cover (p/n WS-X4994-F). The blank power supply cover is color-coded blue.


Physical and Environmental Specifications

Table 1-2 and Table 1-3 lists the Catalyst 4948E and Catalyst 4948E-F switch chassis environmental and physical specifications.

Table 1-2 Catalyst 4948E and Catalyst 4948E-F Switch Specifications - Environment, Heat Dissipation, Shock and Vibrations, Physical Characteristics, and Airflow

Item
Specification

Environmental

 

Temperature, operating

Certified for operation: 32° to 104°F (0° to 40°C)

Designed and tested for operation: 32° to 131°F (0° to 55°C)

Temperature, nonoperating and storage

Chassis unpackaged: -4° to 149°F (-20° to 65°C)

Chassis in protective shipping package: -40° to 158°F (-40° to 70°C)

Thermal transition

0.5°C per minute (hot to cold)

0.33°C per minute (cold to hot)

Humidity (RH), ambient (noncondensing) operating

Operating: 5% to 90%

Nonoperating and storage: 5% to 95%

Altitude, operating

Certified for operation: 0 to 6500 ft (0 to 2000 m)

Designed and tested for operation: -200 to 10,000 ft (-60 to 3000 m)

Heat Dissipation

1364 BTU/hour (worst case)

Shock and Vibration

Refer to "Regulatory Compliance and Safety Information" for shock and vibration compliance information for the switch.

Physical Characteristics

 

Dimensions (H x W x D)

1.75 x 17.5 x 19.4 in. (4.4 x 44.4 x 49.3 cm).

Chassis requires 1 RU.

The Catalyst 4948E and the Catalyst 4948E-F switch chassis are designed to install in standard 19-inch equipment racks that meet ANSI/EIA 310-D, IEC 60297, and ETS 300-119 standards.

Weight

14 lb (6.35 kg). Base system; no power supplies and no fan tray.

19 lb (8.62 kg). Fully loaded system; two power supplies and a fan tray.

Airflow

28 CFM (low speed)

44 CFM (high speed)


Table 1-3 Catalyst 4948E and Catalyst 4948E-F Switch Specifications - Acoustic Noise

Acoustic Noise
Measured per ISO 7779 and declared per ISO 9296

Bystander positions operating mode at 25°C ambient.

Sound Pressure, dBA

Sound Power, dBA

Model

Typical, LpAm

Maximum, LpAD

Typical, LwA

Maximum, LwAD

WS-C4948E

55.6

58.6

62.6

65.6


Fan Tray

Both the Catalyst 4948E and the Catalyst 4948E-F switch chassis have a fan tray that is mounted in the rear of the chassis between the two power supplies. The Catalyst 4948E chassis fan tray (WS-X4993=) provides front-to-back air flow in the chassis and has a front panel that is color-coded dark grey. The Catalyst 4948E-F chassis fan tray (WS-X4993-F=) provides back-to-front air flow and has a front panel that is color-coded blue.


Note The two fan trays are not interchangeable between the Catalyst 4948E and the Catalyst 4948E-F chassis. The WS-X4993-F fan tray is keyed to prevent insertion in the Catalyst 4948E chassis.


Individual fan speed within the fan trays is controlled by redundant temperature sensors located at the air flow inlet (in the front of the chassis for the Catalyst 4948E and in the rear of the chassis for the Catalyst 4948E-F). There are six programmable temperature thresholds that trigger fan speed change. If there is an individual fan failure, the fan speed on the remaining fans is adjusted to try to compensate for the loss of the fan.

Table 1-4 lists the fan speed settings and the associated temperature thresholds.

Table 1-4 Fan Speeds Versus Chassis Temperature Thresholds 

Fan Speed Setting
PWM 1 Duty Cycle
Chassis Temperature Range Thresholds

Speed 0

41%

T2—89.6°F (32°C)

Note At T2, the fan speed increases to Speed 1.

Speed 1

56%

T1—82.4°F (28°C)

T4—102.2°F (39°C)

Note At T1, the fan speed decreases to Speed 0. At T4, the fan speed increases to Speed 2.

Speed 2

75%

T3—95.0°F (35°C)

T6—116.6°F (47°C)

Note At T3, the fan speed decreases to Speed 1. At T6, the fan speed increases to Speed 3.

Speed 32

100%

T5—Greater than 109.4°F (43°C)

1 Pulse-Width Modulation

2 Speed 3 is a fixed value and cannot be altered.


Catalyst 4948E Fan Tray (WS-X4993=)

The Catalyst 4948E fan tray (WS-X4993) contains four variable-speed, 12 VDC fans. (See Figure 1-3.) The fan tray is mounted in the rear of the chassis between the two power supplies.


Note The WS-X4993 fan tray is not interchangeable with the WS-X4993-F fan tray.


Figure 1-3 Catalyst 4948E Fan Tray

1

Backplane connector

3

12 VDC fan (4X). Air is drawn in from the front of the chassis and exhausted through the rear of the chassis.

2

Captive installation screw (2X)

   

The fan tray draws in air through vents at the front of the chassis and exhausts it through the rear of the chassis as shown in Figure 1-4.

Figure 1-4 Catalyst 4948E Chassis Airflow

Catalyst 4948E-F Fan Tray (WS-X4993-F=)

The Catalyst 4948E-F chassis fan tray (WS-X4993-F=) contains four variable-speed, 12 VDC fans. (See Figure 1-5.) The fan tray is mounted in the rear of the chassis between the two power supplies.


Note The WS-X4993-F fan tray is keyed to prevent insertion into the Catalyst 4948E switch chassis.


Figure 1-5 Catalyst 4948E-F Fan Tray

1

Backplane connector

3

12 VDC fan (4X). Air is drawn in from the rear of the chassis and exhausted through the front of the chassis.

2

Captive installation screw (2X)

   

The fan tray draws in air through vents at the rear of the chassis and exhausts it through the front of the chassis as shown in Figure 1-6.

Figure 1-6 Catalyst 4948E-F Chassis Airflow

Front Panel LEDs

A set of LEDs on the chassis front panel provide visual status for the switch. (See Figure 1-7.) Table 1-5 lists the Catalyst 4948E and Catalyst 4948E-F switch chassis front panel LEDs and their meanings.

Figure 1-7 Front Panel LEDs

1

PS1 (power supply 1)

4

STATUS

2

PS2 (power supply 2)

5

MGT (management port LED)

3

FAN (fan tray)

6

LINK (port status). One LED for each uplink and downlink port.


Table 1-5 Front Panel LED Descriptions

LED
State and Meaning

STATUS

Green—The system is up and running.

Red—System fault.

Flashing amber—Power-on self-test (POST) boot up.

Off—System is not powered up.

LINK

48 10/100/1000 downlink port LEDs and 4 SFP/SFP+ uplink port LEDs

Green—Link is established.

Amber—Administrative disabled.

Off—No link is detected.

FAN
(Fan tray)

Green—Fan tray OK.

Red—One or more fan failures.

PS1
(Power supply 1)1

Green—AC-input or DC-input power is OK.

Red—Power supply fault detected.

PS2
(Power supply 2)1

Green—AC-input or DC-input power is OK.

Red—Power supply fault detected.

1 There are three additional LEDs mounted on the power supply front panel that provide power supply status. These LEDs are only visible from the back of the chassis. For a description of the LEDs, see the "300 W AC-Input Power Supply (PWR-C49E-300AC-R)" section.