Cisco Systems CISCO1841-HSEC/K9-RF manual Distance Limitations, Distance for

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Chapter 5 Cable Information and Specifications for Cisco 1800 Series Routers (Modular)

Preparing to Connect to a Network

The synchronous serial port can be configured as DTE or DCE, depending on the attached cable (except EIA-530, which is DTE only). To order a shielded cable, contact customer service. See the “Obtaining Documentation and Submitting a Service Request” section on page 1-15.

Note All serial ports configured as DTE require external clocking from a channel service unit/data service unit (CSU/DSU) or other DCE device.

Although we do not recommend manufacturing your own serial cables (because of the small size of the pins on the DB-60 serial connector), cable pinouts are provided in Cisco Modular Access Router Cable Specifications.

Distance Limitations

Serial signals can travel a limited distance at any given bit rate; generally, the slower the data rate, the greater the distance. All serial signals are subject to distance limits, beyond which a signal is significantly degraded or completely lost.

Table 5-2lists the recommended maximum speeds and distances for each serial interface type; however, you might get good results at speeds and distances greater than those listed, if you understand the electrical problems that might arise and can compensate for them. For instance, the recommended maximum rate for V.35 is 2 Mbps, but 4 Mbps is commonly used.

Table 5-2

Serial Signal Transmission Speeds and Distances

 

 

 

 

 

 

 

 

 

 

 

Distance for

 

 

Distance for

EIA/TIA-449, X.21, V.35,

 

 

EIA/TIA-232

and EIA-530

 

 

 

 

 

 

 

Rate (bps)

 

Feet

Meters

Feet

Meters

 

 

 

 

 

 

 

2400

 

200

60

4100

1250

 

 

 

 

 

 

 

 

4800

 

100

30

2050

625

 

 

 

 

 

 

 

 

9600

 

50

15

1025

312

 

 

 

 

 

 

 

 

19200

 

25

7.6

513

156

 

 

 

 

 

 

 

 

38400

 

12

3.7

256

78

 

 

 

 

 

 

 

 

56000

 

8.6

2.6

102

31

 

 

 

 

 

 

 

 

1544000 (T1)

 

—

—

50

15

 

 

 

 

 

 

 

 

Balanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232 signals. Typically, EIA/TIA-449 and EIA-530 can support a 2-Mbps rate, and V.35 can support a 4-Mbps rate.

Asynchronous/Synchronous Serial Module Baud Rates

The following baud-rate limitations apply to the slow-speed serial interfaces in the asynchronous/synchronous serial modules:

•Asynchronous interface—Maximum baud rate is 115.2 kbps.

•Synchronous interface—Maximum baud rate is 128 kbps, full-duplex.

Cisco 1800 Series Routers (Modular) Hardware Installation Guide

5-4

OL-5876-03

 

 

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Contents Americas Headquarters Text Part Number OL-5876-03Copyright 2005-2008 Cisco Systems, Inc. All rights reserved Interfaces on the Cisco 1861 Integrated Services Router Site Log LED Indicators Modular Objectives Title Description AudienceOrganization Convention Description Safety WarningsConventions Bewaar Deze Instructies Aviso Instruções Importantes DE Segurança Warnung Wichtige SicherheitshinweiseAvvertenza Importanti Istruzioni Sulla Sicurezza Spara Dessa Anvisningar GEM Disse Anvisninger OL-5876-03 Related Documentation Cisco One-Year Limited Hardware Warranty Terms Duration of Hardware WarrantySearching for Cisco Documents Replacement, Repair, or Refund Policy for HardwareTo Receive a Return Materials Authorization RMA Number OL-5876-03 Overview of Cisco 1800 Series Routers Modular Hardware Features Product Serial Number Location,Cisco Product Identification Tool Product Serial Number LocationInterfaces Description Label Interfaces on the Cisco 1861 Integrated Services RouterInterfaces on the Cisco 1841 Router Model CompactFlash Memory Interface Cards AIMs Removable and Interchangeable ModulesMemory Color Description Location LED IndicatorsDescription Specification Chassis Ventilation Real-Time ClockChassis Views Chassis SecurityExample Interface NumberingSlot Number Slot Type Interface Numbering on the 1861 Integrated Services Router Specifications Regulatory ComplianceOL-5876-03 Safety Recommendations Safety with Electricity Preventing Electrostatic Discharge Damage Power Supply ConsiderationsGeneral Site Requirements Site Environment Installation ChecklistSite Configuration Site Log Task Verified by DateInspecting the Router Items in the Box for the Cisco 1841 RouterAssembly hardware screws OL-5876-03 Internal Components Plug-In ComponentsInterfaces on the Cisco 1861 Integrated Services Router Setting Up the Chassis Setting the Chassis on a DesktopAttaching Rack-Mount Brackets 1shows the bracketsInstalling the Router in a Rack Mounting the Chassis in a Rack TypicalWall-Mounting the Cisco 1841 Router Wall-Mounting the ChassisChassis Grounding Wall Router Mounting screws Wall-Mounting the Cisco 1861 Integrated Services Router Rack-Mounting the Cisco 1861 Integrated Services Router Wall-Mount Bracket for Power SupplyBrackets for Rack-Mounting Power Supply Installing the Chassis Ground Connection 11 Chassis Ground Connection on the Cisco 1841 Router 12 Attaching the Ground Wire to the Chassis OL-5876-03 Console and Auxiliary Port Considerations Console Port ConnectionsEthernet Connections Preparing to Connect to a NetworkAuxiliary Port Connections Configuring Serial Connections Signaling Standards SupportedSerial Connections Serial DTE or DCE DevicesDistance for Distance LimitationsAsynchronous/Synchronous Serial Module Baud Rates Low-Capacitance Cable Isdn BRI ConnectionsCSU/DSU Connections OL-5876-03 Power Connections Series Routers ModularPort Type, Color Connected to Cable Connecting WAN and LAN CablesPorts and Cabling Connecting to a Console Terminal or Modem Connection Procedures and PrecautionsConnecting to the Console Port Connecting to the Auxiliary PortConnecting a Modem to the Router OL-5876-03 Powering Up Cisco 1800 Series Routers Routers ModularChecklist for Power Up Power-Up ProcedureYourname con0 is now available Press Return to get started Verifying the LED Indicators on the 1841 Router Color StatusInitial Configuration Verifying the Hardware ConfigurationInitial Configuration of the Router Cisco Router and Security Device Manager Verifying the Initial ConfigurationCompleting the Configuration Powering up the Cisco 1861 Integrated Services Router Description BenefitsDescription Benefits Troubleshooting Cisco 1800 Series Routers Modular Problem SolvingNormal Indications Troubleshooting the Power and Cooling SystemsFault Indications Troubleshooting Cables, Connections, and Interface Cards Environmental Reporting FeaturesReading LEDs System Messages FDXExplanantion Recovering a Lost PasswordMore Troubleshooting Help Related Product Documentation Cisco Interface Cards Installation GuideInstalling WICs, VWICs, and HWICs Card guides Interface card Page OL-5876-03 Replacing CompactFlash Memory Cards 10-1Using the Compact Flash Guard Installing a CompactFlash Memory CardRemoving a CompactFlash Memory Card 10-210-3 10-4 11-1 11-2 Modules Internal to the Cisco 1841 RouterOpening the Chassis 11-3 Removing the Chassis ScrewLocating Modules 11-4Installing a Sodimm 11-5Installing an AIM 11-6Accessory Kit to Use Installation ProcedureCisco Part Number Type 11-711-8 Location of Metal Standoff Attachment Locations11-9 Plastic Standoff OrientationConnecting the AIM to the System Board 11-1011-11 Closing the ChassisApplying the AIM Label 11-12 11 Closing the ChassisACT LED IN-1IN-2

CISCO1841-HSEC/K9-RF specifications

The Cisco Systems CISCO1841-HSEC/K9-RF is a versatile and robust router designed to meet the demands of small to medium-sized businesses and branch offices. This model is part of the Cisco 1800 Series Integrated Services Routers, which are known for their performance, security features, and scalability, making them ideal for organizations seeking to enhance their network infrastructure.

One of the main features of the CISCO1841-HSEC/K9 is its modular architecture. This design allows businesses to customize and expand their networks according to changing needs by adding various modules and interfaces. The router supports multiple WAN interfaces, which include serial, Ethernet, and DSL, providing flexible connectivity options to accommodate various networking scenarios.

The CISCO1841-HSEC/K9 also boasts an integrated security architecture. This router is equipped with advanced security features, including firewall capabilities, VPN support, and intrusion prevention systems. These technologies ensure that data is protected while being transmitted across the network. The built-in security features help organizations safeguard sensitive information against potential threats and cyberattacks.

In terms of performance, the CISCO1841-HSEC/K9 is powered by a high-speed processor and dynamic routing capabilities, which allow it to efficiently handle high volumes of traffic without compromising performance. The router supports various routing protocols, including EIGRP, OSPF, and BGP, facilitating seamless data flow and efficient route management.

Another noteworthy characteristic of the CISCO1841-HSEC/K9 is its support for voice and video services. This capability enables businesses to deploy unified communications applications, such as VoIP and video conferencing, enhancing collaboration among team members and improving overall productivity.

Moreover, the router is designed for easy management and monitoring. Cisco’s IOS software provides a user-friendly interface, allowing network administrators to configure, operate, and troubleshoot the network with ease. The router also supports Cisco’s Smart Install feature for simplified deployment and management.

In summary, the Cisco Systems CISCO1841-HSEC/K9-RF is a powerful and adaptable router that combines security, flexibility, and performance. Its modular design, robust security features, support for various routing protocols, and capabilities for multimedia applications make it a compelling choice for businesses looking to enhance their network infrastructure while addressing current and future demands.
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