当前位置:首页 >> IT认证 >>

DESGN20SG


Identifying Voice Networking Considerations

Designing for Cisco Internetwork Solutions (DESGN) v2.0

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-1

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Reviewing Traditional Voice Architectures and Features

Identifying Voice Networking Considerations

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-4

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Analog-to-Digital Conversion

Steps for converting analog signal to digital format:
Filtering Sampling Digitizing – Quantization and coding – Companding (a-law, mu-law)
2007 Cisco Systems, Inc. All rights reserved. DESGN v2.0—7-5

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

PBXs and Switches
PBX:
Used in private sector Scales to n * 1000 phones Mostly digital Uses 64-kbps circuits Uses proprietary protocols to control phones Interconnects remote branch subsystems and telephones

PSTN switch:
Used in public sector Scales to n * 100,000 phones Mostly digital Uses 64-kbps circuits Uses open-standard protocols between switches and phones Interconnects with other PSTN switches, PBXs, and telephones

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-6

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: PBXs and PSTN Switches

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-7

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

PBX Features

PBX features:
– Call holding – Transferring – Forwarding – Parking – Conferencing – Music on hold – Call history – Voice mail

PBX can connect to PSTN through T1 or E1
2007 Cisco Systems, Inc. All rights reserved. DESGN v2.0—7-8

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

PSTN Switch

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-9

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Local Loops, Trunks, and Interoffice Communications

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-10

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Foreign Exchange Trunks
Foreign Exchange Office (FXO):
Emulates a phone Connects to a station port of a PBX or to the PSTN switch

Foreign Exchange Station (FXS):
Emulates a PBX Provides connections for standard phones and fax machines

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-11

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Basic Telephony Signaling
Local-loop signaling:
Telephone to switch

Trunk signaling:
Switch to switch PBX to switch PBX to PBX

Basic categories:
Supervision signaling Address signaling Informational signaling

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-12

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Analog Signaling on a PBX
Local-loop signaling:
Loop start: – The simplest – For subscriber loops – Occurrences of glare Ground start: – Modification of loop start – More intelligent – For PBX loops – Minimizes glare

Trunk signaling:
E&M (recEive and transMit): – Between PBXs – Five types of signaling – Separate paths for voice and signaling

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-13

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

CAS and CCS Signaling
Channel associated signaling:
Signal for call setup in the same channel as a voice call Examples: – T1 or E1 signaling – DTMF

Common channel signaling:
Messages for call setup Examples: – ISDN – DPNSS – QSIG – SS7

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-14

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

ISDN Digital Signaling
Channel B D Capacity 64 kbps 16/64 kbps Mostly Used For Circuit-switched data Signaling information

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-15

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Q Signaling
Standards-based protocol for inter-PBX communications Enables interconnection of multivendor equipment Enables basic services and feature transparency between PBXs Is interoperable with public and private ISDNs Does not impose any restrictions on private numbering plans

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-16

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

SS7 Signaling

Used between PSTN switches Signaling implemented on a separate data network Trunk channels used solely for voice transmission Replaces per-trunk in-band signaling

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-17

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

PSTN Numbering Plans
Set of rules for routing voice calls through the PSTN Based on the ITU-T recommendation E.164 Example: North American Numbering Plan (NANP)

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-18

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example Country Codes
Country Zone Code 1 1242 1787 1876 20 212 213 30 34 386 44 45 1 1 1 1 2 2 2 3 3 3 4 4 Country Canada, United States Bahamas Puerto Rico Jamaica Egypt Morocco Nigeria Greece Spain Slovenia United Kingdom Denmark Country Zone Code 51 52 61 63 679 7 81 86 886 91 966 995 5 5 6 6 6 7 8 8 8 9 9 9 Country Peru Mexico Australia Philippines Fiji Islands Kazakhstan, Russia Japan China Taiwan India Saudia Arabia Georgia

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-19

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: Routing Calls Based on a Numbering Plan

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-20

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: Routing Calls Based on a Numbering Plan

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-21

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: Routing Calls Based on a Numbering Plan

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-22

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: Routing Calls Based on a Numbering Plan

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-23

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: Routing Calls Based on a Numbering Plan

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-24

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: Routing Calls Based on a Numbering Plan

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-25

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: Routing Calls Based on a Numbering Plan

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-26

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Example: Routing Calls Based on a Numbering Plan

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-27

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Portion of UK National Numbering Plan
Number Range (01xxx) xxx xxx (01xxx) xxx xxx (01x1) xxx xxxxx (011x) xxx xxxxx (02x) xxxx xxxx (01xxx[x]) xxxx[x] (05x) xxxx xxxx (07xxx) xxxxxx (0800) xxx xxx (0800) xxx xxxx (0808) xxx xxxx 999 112 Description Trunk prefix (national long-distance calling prefix)

Geographic numbering options—area code and subscriber number

Mobile phones, pagers, and personal numbering Reserved for corporate numbering. Freephone (except for mobile phone)

Free emergency number

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-28

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

Summary
A telephone system transports analog speech over a digital network. PBXs and public telephone switches share many similarities, but they also have differences. The telephone infrastructure includes local loops and trunks. In a telephony system, a signaling mechanism is required to establish and disconnect telephone communications. Each telephone must have a unique address based on the E.164 standard.

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-29

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be

2007 Cisco Systems, Inc. All rights reserved.

DESGN v2.0—7-30

The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed representations may not be


相关文章:
更多相关标签: