3Com S21x installation manual Txd

Page 54

V.24 Cable

V.24 Cable

V.24 DCE Cable The following table shows the DCE pinouts for the V.24 cable. These pins are assigned double functions in the V.24 cable:

Pin 15: Outputs TRANSMIT CLOCK if the port is configured for internal clocks. Otherwise it acts as a V.54 Loop 3 signal when connected to a modem.

Pin 22: Used as the Ring Indicator output if the port is configured to emulate a dial modem. For this to work properly, the RI/TM switch of the port must be set to RI. When the RI/TM switch is set to TM, this pin acts as an input, and the TM output from the attached modem (pin 25 on the modem) comes into the 6500 on this pin.

Pin

Function/Signal Name

 

 

1

Shield/Frame Ground

 

 

2

TXD

 

 

3

RXD

 

 

4

RTS

 

 

5

CTS

 

 

6

DSR

 

 

7

Signal Ground

 

 

8

DCD

 

 

14

DATA RESTRAINT

 

 

15

TRANSMIT CLOCK or V.54 Loop 3 *

 

 

16

STANDBY INDICATOR

 

 

17

RECEIVE CLOCK

 

 

18

EXTERNAL RECEIVE CLOCK

 

 

20

DTR

 

 

21

V.54 Loop 2

 

 

22

RI/TM *

 

 

24

EXTERNAL TRANSMIT CLOCK

 

 

25

TEST MODE

 

 

B-12

PathBuilder S21x Switch Cabling

Image 54
Contents 3Com Corporation Restricted Rights Notification for U.S. Government Users Restricted Rights LegendProprietary Material Page About This Manual OverviewTrademarks Product Company/OrganizationAbout This Manual How to Use This Manual Chapter DescriptionsThis section Describes Documentation Related DocumentationOther PathBuilder S200Page Contents Contents Chapter CTP Port FeaturesStandard Features Dual DaughtercardDual FXS Voice Voice RelayDaughtercard RelayDIM Site RFC 877 ServiceFrame Relay RFCTarget Application Environments Security Monitoring Central Office At Branch Office Target Application Environments Installing the PathBuilder S21x Switch Hardware Overview Step To Perform This Action See This ProcedureChecking Your Shipment Contents Choosing a Site Proper Cable and Air Clearance Cabling the PathBuilder S21x Switch Port Characteristics Cable Requirements Port Connector Interface Cable Required SpeedPort DIM Interface Connector 10BaseT Ethernet CableSwitch Setting Front Panel Dip SwitchesSwitches Switch Down Posn NameInstalling Optional Daughtercards OptionalDaughtercards Battery Disposal Installing or Removing the Lithium BatteryBattery Type Routine BatteryCoversteps Step ActionInstalling Battery RemovingPowering on the PathBuilder S21x Switch Overview This chapter describesPowering On The PathBuilder S21x Switch SwitchPowerup Diagnostics Panel LEDsPower Up Stage When This indicatesSequence Accessing the Control Terminal Port Page Software SpecificationsHardware Environmental Electromagnetic CompatibilitySafety Power RequirementsPower Supply DescriptionAppendix B CTP Access Cable CTP Cable Connector PinoutRJ45 Pin Signal Pin Connection On DB25F Adapter Pin SpecificationVoice Relay Cable Name FunctionDual FXS Voice Relay Cable FXS10BaseT Crossover Cable Figure B-1. RJ45 PinoutCamera Interface Connector Pinout RemoteVu Video CablesPin Function Pin Signal Function DSU Daughtercard CableCable Pinout Pin Function/Signal Name 35/V.36 Cable35/V.36 DCE 35/V.36 DTE Cable Pin Function/Signal Name TXD TXD RXD RTS CTS DSR Cable Appendix C This AppendixWhile Setting Up Your Configuration CheckingConnection Must be set to Step Action Technical Support Access by Analog Modem Country Data Rate Telephone NumberSupport from 3ComCountry Telephone Number Returning Country Telephone Number Fax NumberIndex NumericsURL

S21x specifications

The 3Com S21x series represents a breakthrough in networking technology, specifically designed for small to medium-sized businesses looking for reliable and efficient networking solutions. This series is renowned for its robust features, which enhance connectivity while simplifying management, making it a go-to choice for organizations striving to optimize their network infrastructures.

One of the standout features of the 3Com S21x is its impressive port capacity. With multiple Ethernet ports, the switch facilitates seamless connections for various devices, ensuring that businesses can scale their operations without worrying about bandwidth limitations. The S21x supports both Fast Ethernet and Gigabit Ethernet connections, providing flexibility for different networking demands.

In addition to its port capabilities, the 3Com S21x incorporates advanced Power over Ethernet (PoE) technology. This feature enables the switch to deliver power to connected devices such as IP cameras, VoIP phones, and wireless access points directly through the network cable. This not only reduces the need for external power sources but also simplifies installation and lowers overall costs.

Another significant characteristic of the S21x is its Layer 2 switching capabilities. This means the device is equipped to handle basic data switching tasks efficiently, including VLAN support for network segmentation and traffic management. VLANs enhance security by isolating sensitive data traffic within specific segments, providing an additional layer of protection for network resources.

The 3Com S21x is also designed with ease of management in mind. It utilizes a user-friendly web-based interface that allows IT staff to configure and monitor the switch effortlessly. This accessibility ensures that even those with minimal networking experience can manage the device effectively, reducing the likelihood of configuration errors and downtime.

Furthermore, the S21x series is built with reliability at its core. The hardware is designed to withstand typical operating conditions in an office environment, minimizing the risk of failure and ensuring consistent performance. Coupled with a focus on energy efficiency, this series helps businesses reduce their operational costs while maintaining a green footprint.

In summary, the 3Com S21x series stands out in networking solutions for small to medium-sized enterprises, featuring a robust combination of port capacity, PoE support, Layer 2 functionality, easy management, and reliability. Organizations looking to enhance their network performance will find the S21x to be an invaluable asset, capable of growing with their needs while ensuring efficient and secure connections.