Chapter 2 Preparing for Router Installation

Network Cabling Specifications

Table 2-1

Typical DTE and DCE Devices

 

 

 

 

Device Type

 

Gender

Typical Devices

 

 

 

 

DTE

 

Male1

Terminal

 

 

 

PC

 

 

 

 

DCE

 

Female2

Modem

 

 

 

CSU/DSU

 

 

 

Multiplexer

 

 

 

 

1.If pins protrude from the base of the connector, the connector is male.

2.If the connector has holes to accept pins, the connector is female.

Signaling Standards Supported

The synchronous serial ports available for the router support the following signaling standards: EIA/TIA-232 (EIA-323). You can order a Cisco DB-25 shielded serial transition cable that has the appropriate connector for the standard you specify. The documentation for the device should indicate the standard used for that device. The router end of the shielded serial transition cable has a DB-25 connector, which connects to the DB-25 port on a serial grid router WAN interface card. The other end of the serial transition cable is available with a connector appropriate for the standard you specify. For a list of the serial cables supported for GRWICs as well as the pinouts, see “Connectors and Cabling for the 8-Port Asynchronous/ Synchronous RS-232 GRWIC” section on page 3-33.

The synchronous serial port can be configured as DTE or DCE, depending on the attached cable.

All serial ports configured as DTE require external clocking from a CSU/DSU or other DCE device.

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 significantly degrades or is completely lost.

Table 2-2lists 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 Mb/s, but 4 Mb/s is commonly used.

Table 2-2

Serial Signal Transmission Speeds and Distances

 

 

 

 

 

 

 

 

 

 

 

Distance for

Distance for X.21 and

 

 

 

 

EIA/TIA-232

V.35

 

Distance for USB

 

 

 

 

 

 

 

 

Rate (bps)

 

Feet

Meters

Feet

Meters

Feet

Meters

 

 

 

 

 

 

 

 

2400

 

200

60

4100

1250

16.4

5

 

 

 

 

 

 

 

 

4800

 

100

30

2050

625

16.4

5

 

 

 

 

 

 

 

 

9600

 

50

15

1025

312

16.4

5

 

 

 

 

 

 

 

 

19200

 

25

7.6

513

156

16.4

5

 

 

 

 

 

 

 

 

38400

 

12

3.7

256

78

16.4

5

 

 

 

 

 

 

 

 

Cisco 2010 Connected Grid Router Hardware Installation Guide

2-8

OL-31454-01

 

 

Page 36
Image 36
Cisco Systems OL-31454-01 manual Signaling Standards Supported, Distance Limitations, Device Type Gender Typical Devices

OL-31454-01 specifications

Cisco Systems OL-31454-01 refers to a specific configuration guide for Cisco networking equipment, which serves an essential role in helping IT professionals understand how to deploy and manage their networking hardware efficiently. This document is particularly relevant for those working with Cisco routers and switches, highlighting various features, technologies, and best practices in network management.

A core feature of Cisco Systems OL-31454-01 is its focus on enhancing network performance and reliability. The systems typically include advanced Quality of Service (QoS) mechanisms, ensuring that critical applications receive the necessary bandwidth and performance even during peak usage times. This is crucial for enterprises that rely on uninterrupted access to applications and services.

The guide also discusses technologies such as VLANs (Virtual Local Area Networks), which allow network administrators to segment networks for improved performance and security. By isolating traffic within different VLANs, organizations can mitigate congestion and enhance overall network efficiency.

Another critical aspect of OL-31454-01 is its in-depth look at security features. Cisco networking solutions typically come equipped with integrated security protocols, such as IPsec for Virtual Private Networks (VPNs) and advanced threat detection mechanisms. This layered approach to security helps protect sensitive data from unauthorized access and cyber threats.

Furthermore, the guide emphasizes the importance of automation and programmability in modern networks. Utilizing Cisco's software-defined networking (SDN) capabilities, network engineers can automate various tasks, reducing the potential for human error and freeing up valuable resources. The integration of tools like Cisco DNA Center provides a unified network management platform, enhancing visibility and control across the entire network.

In addition to these features, Cisco Systems OL-31454-01 outlines various compatibility options with existing technologies and infrastructure. The guide ensures that IT teams can seamlessly integrate new hardware into their current networks without significant overhauls, facilitating a more efficient transition.

Overall, OL-31454-01 serves as a comprehensive resource for deploying and managing Cisco systems, offering valuable insights into essential features, technologies, and best practices that can significantly enhance an organization's networking capabilities.