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Position:IcFull.com » IC Electronic information » Category: H

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How TDM-Over-Packet IC and other devices interoperability TDMoP

In Electronic Infomation Category: H | on March 19,2011

Abstract: Interoperability is a system through the system with little or no operator intervention and CC01302C1 datasheet and work with other systems to achieve the capacity. System interoperability to other systems make it possible to provide services or accept services from other systems, making systems from different vendors to work together. This application note describes how to set DS34S132 TDM-over-Packet (TDMoP) IC, and CC01302C1 price and other TDMoP devices to interoperate.

Introduction

Needless to say, todays communications systems require different equipment and CC01302C1 suppliers and the complex interactions between devices. As technology advances, interoperability has become more important. Interoperability is a system through the system with little or no operator intervention and work with other systems to achieve the capacity. System interoperability to other systems make it possible to provide services or accept services from other systems, so the system from different vendors can work together.

This application note focuses on Maxim TDM-over-Packet (TDMoP) IC, DS34S132. This article introduces and other vendors in DS34S132 TDMoP interoperability between devices to set requirements.

Interoperability requirements

Maxims TDMoP packets generated by the device manufacturers and other header information TDMoP devices may be different. In order to achieve interoperability TDMoP devices, users need to know to set the device type. Maxim device is set to one of the following:

IP / UDP / RTP / SAToP

IP / UDP / RTP / CESoPSN

MEF/RTP/CESoETH- unstructured (ie, MEF / SAToP)

MEF/RTP/CESoETH- structured lock (ie, MEF / CESoPSN)

MPLS/RTP/SAToP- unstructured (ie, MPLS / RTP / SAToP)

MPLS/RTP/CESoPSN- structured lock (ie, MPLS / RTP / CESoPSN)

TDMoP devices each has a different set header. In order to achieve interoperability, must be the device from Maxim TDMoP header format the header and other similar devices. This means that users need to compare TDMoP device header, and find the format differences. This application note describes how to use the Maxim DS34S132 TDMoP the application to modify the device header. The article also describes how to modify the configuration Maxim bound to accept the deal the same header information, but different data packets.

TDMoP format

This section describes the TDM-over-Packet modules functional description. Transmission through the packet switching network for TDM data, TDMoP TDM device will be encapsulated as Ethernet packets of data shown in Figure 1. TDMoP header description of the different data blocks, see Table 1.

Figure 1. Ethernet packet format TDMoP package.

Table 1. Ethernet packet structure

field

Help

Leader

56 bit sequence (1 and 0 value of the alternating ) , used for synchronization. Devices on the network to provide detection signals appear.

start frame delimiter

8 bit sequence (10101011) , the packet start.

target and Source Address

destination address field indicates the receive data terminals. Send the packet source address indicates the terminal. Destination address can specify a target for a single terminal " single address " , or target a group of workstations " Multicast Address " . All bits are 1 the destination address that LAN on all terminals, known as " Broadcast address " . "

Type

Ethernet Type

data and filler

This field contains the terminal from the source data transmission to the target terminal. The maximum size of the domain 1500 bytes. From the target frame check sequence address field to the minimum Ethernet packet size is 64 bytes. If the domain of the package size of less than 64 bytes, the use of filler to achieve the minimum length of the packet size.

Frame Check Sequence

the domain, including 4 byte cyclic redundancy check ( CRC ) value, use in error checking. Encapsulated packet source terminal, the data package to the filler from the target address field all the bits ( that is In addition to leading operators, start frame delimiter and frame check sequence of all fields other than ) implementation CRC calculation. Source terminal will calculate the value stored in the field, and as part of the packet sent. Target terminal receives the packet, perform the same check. If the calculated value and the value does not match the domain, the target terminal is considered an error occurs during transmission, and the packet is discarded.

Order to achieve interoperability, users need to pay attention to the two parts of TDMoP header:

1.UDP/IPv4 header interoperability

2.RTP header interoperability

UDP/IPv4 header interoperability Figure 2 shows the UDP/IPv4

header structure. Tables 2 and 3 IPv4 and detailed description of the structure of the UDP header different domains.

Figure 2. UDP/IPv4 header.

Table 2. IPv4 header structure

field

Help

IPVER < / SPAN>

IP version; IPv4 IPVER = 4

IHL < / SPAN>

to 32 bit word that the IP header length, IHL = 5

IP TOS

IP service type

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