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Terayon TA-102, Technical Support Manual

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Chapter 4  PacketCable Network Architecture

Placing a Call in a PacketCable Network

4-12

TA 102/202 Technical Support Guide

And that is exactly what happens when Brad picks up the phone and says, “Hello”. 
MTA

B

 digitizes and packetizes Brad’s voice and transmits the packets with the IP 

address of MTA

A

 in the destination field. The opposite occurs at Athena’s end, and the 

two are now talking.

When one of the callers puts the phone down, the associated MTA signals the far end 
and it’s local CMTS that the call is complete. The local CMTS recovers the bandwidth 
resources used for the call and sends instructions to the far-end CMTS to release its 
HFC network bandwidth. Finally, several kinds of billing and logging messages are sent 
to the ACE Cable Company billing and event data bases to ensure Athena is billed for 
the extremely high quality call she just enjoyed.

Summary of Contents for TA-102

Page 1: ...Terayon Communication Systems TA 102 202 eMTA Technical Support Guide Part No 8500276 Rev B December 2004 ...

Page 2: ...ems 4988 Great America Parkway Santa Clara CA 95054 U S A e mail data support terayon com for technical support marketing terayon com for product information Feedback and suggestions to Technical Publications Group techpubs terayon com Worldwide Web http www terayon com European Support Telephone 32 1 638 4772 email eurospport terayon com for technical support Asia Pacific Support Telephone 852 21...

Page 3: ...eech Codec 1 7 MIB Support 1 8 Security 1 9 Quality of Service QoS 1 9 Standards Compliancy 1 9 DOCSIS 2 0 Euro DOCSIS 1 1 1 9 PacketCable 1 10 Chapter 2 Installation Getting Started 2 2 Package Contents 2 2 Terayon TA 102 or TA 202 MTA Modem Package Contents 2 2 System Requirements 2 2 MTA Installation 2 4 What the Customer Will Need 2 4 Modem Connectors 2 5 CATV Coax Cable to TA 102 202 eMTA 2 6...

Page 4: ...lem 3 4 Possible Solution 3 4 Problem 3 4 Possible Solution 3 4 Problem 3 5 Possible Solution 3 5 Problem 3 6 Possible Solution 3 6 Problem 3 6 Possible Solution 3 6 Problem 3 7 Possible Solution 3 7 Problem 3 8 Possible Solution 3 8 Problem 3 8 Possible Solution 3 8 Problem 3 8 Possible Solution 3 8 TA 102 202 eMTA Front Panel LED Definitions 3 9 Chapter 4 PacketCable Network Architecture PacketC...

Page 5: ...TA 102 202 Technical Support Guide v OSS Support Systems OSS 4 7 Provisioning Servers 4 8 Security Servers 4 8 Record Keeping Servers 4 8 PSTN Gateway 4 9 Placing a Call in a PacketCable Network 4 10 ...

Page 6: ......

Page 7: ...at s in the chapter You ll also find that some topics may be covered in more than one place in the guide with one location providing more information than the other When this happens we provide a cross reference to where the topic is covered in detail About This Guide The following tells you what we have included between the covers of this guide Organization Chapter 1 Overview outlines the functio...

Page 8: ...chitecture of a PacketCable network If you have an understanding of how PacketCable works or you don t care how it works you can probably skip this chapter But it won t hurt to look it over anyway Icons Used in This Guide WARNING Warning icons and messages alert you to possible physical harm to you or the equipment CAUTION Caution icons and messages are equipment damage precautions to alert you to...

Page 9: ...ol functions required for PacketCable telephony calls Chapter 1 provides a brief overview of TA 102 202 eMTA features and functions The material presented includes What is an Embedded MTA The TA 102 202 eMTA at a Glance Hardware Architecture MIB Support Security Quality of Service QoS Standards Compliancy Figure 1 1 The TA 102 202 eMTA Power Line 1 Line 2 TA 102 Cable PC Data Test ...

Page 10: ...em is a device that resides in the subscribers home and actually generates and places upstream signals on the coaxial cable It also decodes the raw downstream signals from the network so they can be interpreted by the MTA Figure 1 2 TA 102 202 eMTA Embedded Multimedia Terminal Adapter eMTA An MTA and a CM in one package Functions Converts voice signals to IP packets and vice versa Generates multip...

Page 11: ...f of DOCSIS or Euro DOCSIS technology This makes the TA 102 202 eMTA the most scal able VoIP solution available Features Exclusive OpenPHY A TDMA and S CDMA technology Delivers substantially more bandwidth for enhanced scalability and superior noise immunity for extremly high quality calls Single platform for integrated voice and data services Exceptional scalability and cost effective especially ...

Page 12: ...e eMTA and the following sections describe its I O interfaces Figure 1 3 TA 102 202 eMTA Basic Architecture iMEDIA BROADBAND MODEM CHIP ETHERNET INTERFACE USB INTERFACE HV SUBSCRIBER LINE INTERFACE CIRCUIT HV SUBSCRIBER LINE INTERFACE CIRCUIT LV SUBSCRIBER LINE INTERFACE CIRCUIT SPEECH CODEC TUNER 4 MB FLASH MEMORY 16 MB SDRAM RF IN OUT CONTROL USB CONN RJ 45 CONN RJ 11 CONN RJ 11 CONN A D D A CAB...

Page 13: ...202 eMTA Interface Connectors RF Interface Like a television set an eMTA requires a tuner to receive information from a cable chan nel But unlike the television set the eMTA can transmit information to the cable chan nel thus requiring a tuner that can send and receive digital information The TA 102 202 eMTA uses a specially designed tuner for subscriber side cable modem applications The tuner cov...

Page 14: ...SB Interface The USB Interface provides the physical interface to the USB cable and consists of a standard USB connector USB port transient voltage suppressors a switching current source and associated components In other words it has all the control circuitry and line drivers to support 12 Mbps operation including the CM USB Communications 1 1 Class Driver POTS Interface For a POTS Plain Old Tele...

Page 15: ...in an MTA responsible for signal conversion is called a Codec Figure 1 5 illustrates the function of a Codec Figure 1 5 A Codec at Work In the TA 102 202 eMTA the Speech Codec see Figure 1 3 is a Digital Signal Processor DSP It carries out the analog to digital and digital to analog signal conversion What s inside a DSP A DSP contains these key components Program Memory Stores the program the DSP ...

Page 16: ...upports the following MIBs Managed Objects defined in PacketCable 1 0 MIBs DOCSIS 1 1 MIBs IETF SNMP MIB II per RFC 1213 with SMIv2 updates per RFC 1907 2013 2012 and 2011 are accessible via the SNMPv3 interfaces The TA 102 202 eMTA supports SNMPv3 with USM and VACM per RFCs 2261 2273 2270 and 2275 It also supports SMIv2 per RFC 2578 2579 2580 The following attributes from MIB II are supported Sys...

Page 17: ...ration is based on the concept of least privilege Quality of Service QoS The TA 102 202 eMTA supports pre provisioned Service Flows as described by the DOCSIS 2 0 specification and 32 SIDs It also supports static and dynamic packet classifiers along with flow scheduling mechanisms to deliver differentiated Type of Service ToS bits to mark IP traffic Voice QoS is according to PacketCable specificat...

Page 18: ...he following PacketCable documents PKT SP CODEC I05 040113 PKT SP DQOS I09 040402 PKT SP EC MGCP I09 040113 PKT SP MIB MTA I07 030728 PKT SP MIB SIG I07 030728 PKT SP MIBS I07 030728 PKT SP PROV I09 040402 PKT SP SEC I10 040113 Euro PacketCable The TA 102 202 eMTA is fully compliant with the requirements described in the TS 101 909 series documents part 1 to part 26 ...

Page 19: ...the customer receives with the equipment The material presented includes Getting Started Package Contents System Requirements MTA Installation What the Customer Will Need Modem Connectors CATV Coax Cable to TA 102 202 eMTA Connecting the Power Adapter to the TA 102 202 eMTA Connecting the TA 102 202 eMTA to a PC Connecting A Telephone to the TA 102 202 eMTA TA 102 202 eMTA Start Up Front Panel Ind...

Page 20: ...Terayon Model TA 102 or TA 202 MTA Modem Modem Stand MTA modem Power Adaptor RJ 45 Ethernet Cable Universal Serial Bus USB Cable CD ROM with USB Drivers System Requirements To install the TA 102 202 eMTA the customer computer system requires the following hardware and software Hardware Software IBM PC or Compatible Apple Macintosh CPU Pentium class microprocessor or equivalent Power PC 601 or late...

Page 21: ...sh operating system must use an Ethernet port to connect the TA 102 202 eMTA MODEM STAND RJ 45 ETHERNET CABLE USB CABLE CD ROM WITH USB DRIVERS POWER ADAPTER NOTE The appropriate Power Adapter is included with your modem Power Line 1 Line 2 TA 102 TERAYON MULTIMEDIA TERMINAL ADAPTER MODEM MODEL TA 102 or TA 202 Cable PC Data Test T e r a y o n A C A d a p t o r ...

Page 22: ...h wrench or spanner When installing the TA 102 202 eMTA a cable splitter and two new cables are required The cable splitter divides the incoming signal from the cable company into two signals one for the household TVs and one for the MTA modem No TV sets are allowed on the cable that connects to the MTA modem Figure 2 2 illustrates a typical MTA modem installation Figure 2 2 Typical TA 102 202 eMT...

Page 23: ... 202 eMTA to the incoming signal from the cable company via a cable splitter 2 DC Power Input jack Connects the TA 102 202 eMTA to the Modem Power Adaptor or an optional Battery Backup Unit 3 RJ 45 Ethernet Port Connects the TA 102 202 eMTA to the Ethernet port on the computer NIC card 4 USB Serial Port Connects the TA 102 202 eMTA to the USB port on the computer 5 RJ 11 Line 1 Port Connects the T...

Page 24: ...me other location 2 When you locate the CATV coaxial cable disconnect it from the TV Converter Box or VCR You may need to use a wrench to disconnect the cable 3 Locate the cable splitter then using Figure 2 4 as a guide connect the CATV coax cable you disconnected in step 2 to the IN connector on the cable splitter Tighten the connector with a 7 16 inch wrench Figure 2 4 Connecting Coax Cables to ...

Page 25: ...e to the TA 102 202 eMTA Connecting the Power Adapter to the TA 102 202 eMTA Power for the TA 102 202 eMTA is generated by an AC Power Adapter unit that comes with the unit or by an optional BU 802 Battery Backup Unit If the subscriber is going to use the BU 802 Battery Backup Unit procced to BU 802 Battery Backup Unit Installa tion on page 2 16 If the subscriber is going to use only the AC Power ...

Page 26: ...the key groove on the DC Output plug with the key slot in the DC Power Input jack on the back of the eMTA 3 Push the plug into the jack so the cable is firmly connected Figure 2 6 Connecting the Power Adaptor to the TA 102 202 eMTA IMPORTANT Do not connect the Adaptor to an AC outlet at this time POWER ADAPTER OUTPUT CONNECTOR DC POWER INPUT JACK TO POWER ADAPTER TERAYON MULTIMEDIA TERMINAL ADAPTE...

Page 27: ...10 100 Base T Ethernet Cable on page 2 9 If the PC is equipped with a USB Serial Port proceed to Connecting the USB Cable on page 2 11 Connecting the 10 100 Base T Ethernet Cable To connect the 10 100 Base T Ethernet cable follow these steps 1 Retrieve the 10 100 Base T Ethernet cable from the box the TA 102 202 eMTA came in 2 Using Figure 2 7 as a guide connect one end of the 10 100 Base T Ethern...

Page 28: ...cal Support Guide Figure 2 7 Connecting the 10 100Base T Ethernet Cable 10 100 BASE T ETHERNET CABLE RF CABLE TO SPLITTER PC TOWER REAR VIEW ETHERNET INTERFACE CARD ETHERNET PORT RJ 45 ETHERNET PORT TERAYON MULTIMEDIA TERMINAL ADAPTER MODEM MODEL TA 102 or TA 202 ...

Page 29: ...nector into the USB Serial port on the back of the TA 102 202 eMTA 3 Insert the USB cable A connector into the computer USB Serial port on the back of the computer 4 If you are going to connect a telephone to the modem proceed to Connecting A Tele phone to the TA 102 202 eMTA on page 2 13 If you are not going to connect a tele phone to the modem proceed to TA 102 202 eMTA Start Up on page 2 14 IMP...

Page 30: ...ation 2 12 TA 102 202 Technical Support Guide Figure 2 8 Connecting the USB Cable RF CABLE TO SPLITTER USB CABLE PC TOWER REAR VIEW PC USB PORT USB PORT B CONNECTOR A CONNECTOR TERAYON MULTIMEDIA TERMINAL ADAPTER MODEL TA 102 or TA 202 ...

Page 31: ... place it where you wish to locate it 2 Verify the telephone has an RJ 11 telephone cable connected to it If the telephone does not have a telephone cable connected to it the customer can purchase one at a local retail store 3 Using Figure 2 9 as a guide insert the telephone cable RJ 11 plug into the Line 1 RJ 11 jack on the back of the unit 4 If you have a second telephone insert the telephone ca...

Page 32: ...ng the TA 102 202 eMTA do the following 1 Plug the Power Adaptor into an appropriate AC power outlet Once the TA 102 202 eMTA is properly connected and power is applied it will auto matically boot up and start scanning for an active downstream channel 2 Verify the Power and PC LED indicators on the unit front panel are ON ...

Page 33: ...ntinuously when network access has been disabled by your cable company Solid when modem registration is complete and ready to transfer data PC Green Dark when there is no carrier signal present to or from your PC or when power is Off Solid when there is a carrier signal present to or from your PC Flashes slowly when data switch is OFF and PC con nected Data Green Dark when there is no data passing...

Page 34: ...he BU 802 Battery Backup Unit As a battery backup unit the BU 802 senses an AC power loss and automatically switches to battery power so the TA 102 202 eMTA remains operational during an AC power outage When AC power is restored battery power is switched out and the Power Adapter provides DC power for the TA 102 202 eMTA Figure 2 10 BU 802 Battery Backup Unit BU 802 units can hold two lithium batt...

Page 35: ... packs are replaced incorrectly Replace battery packs only with the same or equivalent type recommended by the manufacturer Dispose of used batteries according to the manufacturer s instructions Two 2S1P Lithium Ion Battery Packs One 2S1P Lithium Ion Battery Pack Two 2S2P Lithium Ion Battery Packs One 2S2P Lithium Ion Battery Pack One 2S2P Lithium Ion Battery Pack One 2S1P Lithium Ion Battery Pack...

Page 36: ...thin easy cable reach of the AC Power Adapter Unpacking the BU 802 Battery Backup Unit The BU 802 Battery Backup Unit comes in a single shipping container that includes battery packs To unpack your BU 802 Battery Backup Unit do the following 1 Inspect the shipping container before opening If you see there is damage to the shipping container arrange for an agent of the car rier to be present when y...

Page 37: ...Phillips screw driver and remove the two screws that fasten the unit back plate battery cover to the plastic case Then lift the back plate up and away from the case 2 Locate the battery or batteries that came with the BU 802 and place them near the unit Figure 2 12 BU 802 Backplate Battery Cover Removal 3 Referring to Figure 2 13 insert battery pack cable connectors into the battery cable receptac...

Page 38: ...gure 2 14 Backplate battery cover Reinstallation BU 802 BATTERY BACKUP UNIT BU 802 BATTERY BACKUP UNIT BATTERY 1 CABLE CONNECTOR BATTERY 2 CABLE CONNECTOR BATTERY CABLE RECEPTACLE BATTERY CABLE RECEPTACLE LITHIUM ION BATTERY PACK 1 LITHIUM ION BATTERY PACK 2 BU 802 BATTERY BACKUP UNIT BACKPLATE FASTENING SCREWS 2 EA DC POWER CABLE TO TA 102 202 eMTA ...

Page 39: ...or with the key slot in the TA 102 202 eMTA DC voltage input jack then push the connector into the jack so the cable is firmly connected Figure 2 15 Mating the TA 102 202 eMTA to the BU 802 3 Locate the Power Adapter that came with the modem 4 Using Figure 2 18 as a guide align the key groove of the Power Adapter DC Output connector with the key slot in the BU 802 voltage input jack then push the ...

Page 40: ... For best results read the entire procedure before starting 1 Remove the BU 802 back plate battery cover then place and hold the back plate to the selected mounting surface 2 Using a pencil trace the back plate mounting hole locations onto the mounting sur face as shown in Figure 2 16 3 Reinstall the backplate onto the BU 802 as shown in Figure 2 14 Figure 2 16 Mounting Hole Tracing BATTERY BACKUP...

Page 41: ... Install the mounting screws into the mounting holes wood screws for a wood sur face Molly Bolts for wall board Do not tighten the screws all the way down Leave some space between the mounting surface and the screw head so you can mount the BU 802 onto the screws 6 Using Figure 2 17 as a guide align the back plate mounting holes over the two mounting screws then slide the unit onto the mounting sc...

Page 42: ...02 Battery Backup Unit 4 Plug the male end of the Power Adapter power cord into an AC outlet to power up the BU 802 and the TA 102 202 eMTA 5 Verify the BU 802 Battery Status LED is a solid green color to indicate the BU 802 receiving DC power from the AC Power Adapter 6 After powering up the BU 802 wait 10 minutes then disconnect the Power Adapter power cord from the AC outlet 7 Verify the BU 802...

Page 43: ...attery Status LED Location Since the Battery Status LED has multi color capability your cable company has the option of choosing a Default LED pattern or an Optional LED pattern You may want to call your cable company to find out what LED pattern they have configured the BU 802 Battery Backup Unit to use Just so you won t have to rush out and acquire a secret decoder ring we have provided the foll...

Page 44: ...wer is less than 25 of maximum capacity Red One of the two installed battery packs is defective Flashing Red Both installed battery packs are defective or no battery packs have been installed Dark Battery packs have not been installed and the Power Adapter is not supplying the BU 802 with DC voltage most likely not connected to the BU 802 Table 2 2 Battery LED Status Conditions Optional Pattern LE...

Page 45: ... one 2S1P battery pack Up to 2 hours one 2S2P battery pack Up to 4 hours two 2S2P battery packs Battery Type 2 rechargeable sealed Lithium Ion battery packs 7 4 volts nominal output Battery Charge Time 24 hours after fully discharged Input DC Voltage 9 to 15 VDC Battery Backup Unit DC Output Voltage 7 to 8 4 VDC Normal Operating Temperature 32 F 0 C to 113 F 45 C Normal Operating Humidity 20 to 90...

Page 46: ......

Page 47: ...Upstream channel acquisition Ranging Cable LED Blinking Rapidly 4 Cable Modem establishing IP connectivity via DHCP server 5 Obtain Time of Day 6 Download configuration file via TFTP server Cable LED Turned On and Steady 7 Registration to authorize traffic forwarding 8 Baseline Privacy initialization if enabled 9 Cable Modem in operational state Line 1 LED Blinking Slowly 10 MTA establishes connec...

Page 48: ...e 1 and 2 LEDs Blinking Rapidly 21 MTA finds the KDC associated with the Call Management Server CMS 22 MTA resolves KDC server FQDN with DNS 23 MTA obtains tickets to the provisioning server from the KDC 24 MTA finds the CMS 25 MTA resolves CMS FQDN with DNS 26 MTA establishes IPSEC SA with CMS per line Line 1 and 2 LEDs ON and Steady 27 MTA registers each Line with corresponding CMS ...

Page 49: ...replace the Power Adapter or the TA 102 202 eMTA If using a Battery Backup Unit verify it is producing the correct operating voltage If not replace the Bat tery Backup Unit No Downstream carrier Verify TA 102 202 eMTA cabling Check for presence of a video signal Verify power levels Verify CMTS operation Replace the TA 102 202 eMTA Ranging Failed Verify power levels Verify CMTS operation Replace th...

Page 50: ...anel should be a solid color If the Power Cable and PC indicator lights LEDs are solid green not blinking your TA 102 202 eMTA is operating properly Try shutting down and powering off your com puter and then turning it back on This will cause your computer to re establish commu nications with your cable company server 1 If you are using the cable line splitter try bypassing the splitter by disconn...

Page 51: ...art up all the modem LEDs come ON Possible Solution A possible solution to this problem is to reset the MTA modem To reset the MTA modem follow these steps 1 Inset a pointed object such as the end of a paper clip into the Reset Switch access hole on the back panel of the MTA modem see Figure 3 1 2 Push the pointed object to depress the Reset Switch This action forces the MTA modem to re boot Figur...

Page 52: ...er try bypassing the splitter by disconnecting it and running a single coaxial cable between the MTA modem and the cable wall jack Try reconnecting after making this change If reconnecting is successful the subscriber may have a bad splitter Additionally verify the downstream signal is signal power is 15 dbmV to 15 dbmV Problem The power on my modem goes on and off sporadically The Power light nev...

Page 53: ...ing data to the PC To fix the problem press the Data Switch once see Figure 3 2 then verify the PC LED has stopped blinking If the PC LED is still blinking call your cable company for service Figure 3 2 Pressing the Data Switch NOTE NOTE You can disable the Data Switch by implementing the Terayon TLV 11 MIB in the MTA modem configuration file DATA SWITCH TERAYON MULTIMEDIA TERMINAL ADAPTER MODEM M...

Page 54: ... If the cable connections check OK replace the phone and or the RJ 11 telephone cable If either Line 1 or Line 2 LEDs are OFF dark or flashing contact your service provider and verify you have subscribed for voice service and that your service is properly defined Problem When I make a phone call voice quality is bad Possible Solution Voice quality is defined by the type of service you have subscri...

Page 55: ...ta Green Dark when no data is passing through modem or when power is Off Flashing when CPE is receiving data Test Green Dark when initial modem self test is OK or power is Off Flashing when modem self test is in process or when the modem is receiving software updates Flashes when the modem fails the initial self test during startup Solid when the modem fails the initial self test Line 1 Green Duri...

Page 56: ......

Page 57: ...l ity Chapter 4 delves into the architecture of a PacketCable network If you have an understanding of PacketCable network architecture you can probably skip this chapter But it won t hurt to look it over anyway The material presented includes PacketCable Network Architecture PacketCable Functional Components Placing a Call in a PacketCable Network PacketCable Network Hello Hello EMBEDDED MTA EMBED...

Page 58: ...ring to Figure 4 1 the HFC network provides reliable high speed and secure data transport between the cable customer premise and the cable headend This access net work may provide DOCSIS 1 1 and or DOCSIS 2 0 capabilities including Quality of Ser vice MANAGED IP BACKBONE ROUTER ROUTER ROUTER ROUTER MANAGED IP NETWORK BW 3500 CMTS HFC NETWORK PC EMTA TELEPHONE BW 3500 CMTS HFC NETWORK PC EMTA TELEP...

Page 59: ...e Network PSTN PSTN simply refers to the local long distance and international phone system which we use everyday PacketCable Functional Components PacketCable Architecture requires numerous network elements with well defined interfaces between those elements In the following sections we describe the functional components in the PacketCable Network Note that not all components are required to be p...

Page 60: ...le operator s headend or distribution hub the CMTS operates at the edges of the backbone network and the HFC cable modem network The primary function of the CMTS is to route packets between a cable modem network and a headend backbone It is the traffic cop responsible for the fate of packets whizzing between the two networks Embedded Multimedia Terminal Adapter eMTA An MTA and a CM in one package ...

Page 61: ...e cable that connects a subscriber to the headend is a shared resource The CMTS must manage this resource efficiently fairly and with a very fast response to changing requests for access from cable modems Figure 4 3 Cable Modem Termination System CMTS CMTS Gate A CMTS Gate is a software application that runs on the CMTS It is a functional component that performs classification and enforces QoS pol...

Page 62: ...omponent of the CMS responsi ble for providing signaling services using NCS protocol to the MTA Call Agent responsibilities include but are not limited to Implementing call features Maintaining call progress state The use of codecs within the subscriber MTA Collecting and pre processing dialed digits Collecting and classifying user action Gate Controller GC Gate Controller is a QoS software applic...

Page 63: ...er the ANC interprets the information and manages the ses sion Announcement Player ANP Functioning under the control of the ANC the announcement player receives and interprets commands from the ANC and delivers the appropriate announcement to an MTA It also accepts and reports user inputs e g Dual Tone Multi Frequency tones OSS Support Systems OSS Referring to Figure 4 1 Operational Support System...

Page 64: ...ioning process A DNS server maps between ASCII domain names and IP addresses and a TFTP server downloads configuration files to an MTA Additionally a SYSLOG server collects events such as traps and errors from an MTA Security Servers Security management touches every component and interface in the PacketCable network The key headend server responsible for security is the Key Distribution Center KD...

Page 65: ...the PSTN Gateway is broken down into three functional components Media Gateway MG serves as the interface between the two networks for media Signaling Gateway SG serves as the interface between the two networks for signal ing Media Gateway Controller MGC controls the Media Gateway Figure 4 7 PacketCable PSTN Interface Architecture PSTN Gateway Serves as an interface device between the PacketCable ...

Page 66: ... the phone company central office it is being generated by the MTA her phone is con nected to Athena dials Brad s phone number On a regular PSTN phone line each digit is sent to the central office as it is dialed A switch in the central office collects the digits and checks after each digit to see if an entire phone number has been dialed On the ACE Cable Company PacketCable Network things are ver...

Page 67: ...is told the IP address of MTAB and vice versa From this point on the MTAs place each other s IP address in the destination fields of the UDP packets they generate The HFC network routes the packets directly between the MTAs instead of forcing the pack ets to pass through the Call Management Servers CMTSA CMTSA CMTSB CMTSB CMSB CMSA MTA A MTA A MTA B MTA B 4 C M T S i n s t r u c t e d t o r e s e ...

Page 68: ...posite occurs at Athena s end and the two are now talking When one of the callers puts the phone down the associated MTA signals the far end and it s local CMTS that the call is complete The local CMTS recovers the bandwidth resources used for the call and sends instructions to the far end CMTS to release its HFC network bandwidth Finally several kinds of billing and logging messages are sent to t...

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