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3/16/2017
What is SDH and what is the difference between SDH and PDH? | Home Us
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WHAT IS SDH AND WHAT IS THE DIFFERENCE BETWEEN SDH AND PDH?
Aug
12 2008
What is SDH and what is the di៚�erence between SDH and PDH?
Summary: SDH is very useful equipment that is used for the telecommunication sector in easy transfer of data. Earlier PDH was widely used but due to some of its weaknesses, SDH has replaced the use of PDH. But not everywhere. Point to Point applications are still used mainly by PDH, and also, it’s cheaper. PDH or the plesiochronous digital hierarchy is a popular technology that is widely used in the networks of telecommunication in order to transport the huge amounts of data over the digital equipment for transportation like microwave radio or 䘄ber optic systems. The term plesiochronous has been derived from the Greek work ‘plesio’ that means ‘near’ and ‘chronos’ meaning time. This means that the PDH works in a state when the various di៚�erent parts of a network are clearly synchronized. But with the change in technology, the PDH is now being replaced by the SDH or what is popularly called as synchronous digital hierarchy. The SDH is useful equipment that is used in most of the telecommunications networks. This PDH helps in proper transmission of the data that generally runs at the similar rate but allows some slight variation in the speed than the nominal rate. The basic transfer rate of the data is 2048 kilobits per second. For instance, in each speech transmission, the normal rate breaks into di៚�erent thirty channels of 64 kilobits per second along with two di៚�erent 64 kilobits per second in order to perform the tasks of synchronization and signaling. The typical rate of transmitting the data over the 䘄ber optic systems is 565 Mbit/sec in order to transport the data in the long distance. But as the technology has improved with the ing of time, now the telecommunication companies have replaced the PDH equipment with that of the SDH equipment, which has the capability of transmitting the data at much higher rates as compared to the PDH system. The SDH is an international standard that is highly popular and used for its high speed data transfer of the telecommunication and digital signals. This synchronous system has been specially designed in order to provide a simple and 䘄exible network infrastructure. This system has brought a considerable amount of change in the telecommunication networks that were based on the optical 䘄bers as far as performance and cost were concerned. The weaknesses that PDH faced paved way for the introduction and use of the SDH systems. Although the PDH proved to be a breakthrough in the 䘄eld of digital transmission, the weaknesses that made it less demanded includes: 1. Asynchronous structure that is rigid. 2. Restricted management capacity. 3. Non availability of world standard on the digital formats. 4. No optical interfaces world standard and without an optical level, networking is not possible. But if we compare the PDH system with that of the SDH system, the latter one has a large number of advantages. Some of the most common advantages enjoyed by the usage of SDH include: 1. optical interfaces 2. capability of powerful management 3. world standard digital format 4. synchronous structure is 䘄exible 5. cost e៚�ective and easy tra鄅c cross connection capacity and add and drop facility 6. reduced networking cost due to the transversal compatibility 7. forward and backward compatibility Apart from all the advantages mentioned above, the SDH also has various management capabilities such as performance management, security and access management, con䘄guration management and the event or the alarm management. So, we can clearly make a distinction between http://www.adnet.com.tw/whatissdhandwhatisthedifferencebetweensdhandpdh/
1/3
3/16/2017
What is SDH and what is the difference between SDH and PDH? | Home
the PDH and SDH systems so that as per the needs of the telecommunication, the appropriate transmission system can be used. Please note also, that PDH, if we talk as n x E1 G.703 lines to be transmitted, can be developed only up to 16 E1 lines – 34 Mbit/s. But SDH – can reach 155 Mbit/s, which corresponds to STM-1, can reach 622 Mbit/s – STM-4. Good example of PDH 䘄ber multiplexer is this product. However, it has to be noted. that AD-net has done a huge work bridging the gap between SDH and PDH systems, o៚�ering customers a SDH systems – particulary from miniSDH and microSDH range, and – close to PDH price! For example, most of the suppliers, if we talk about more than 16E1 – are not able to o៚�er units at reasonable price and still 1U or even 2U high. AD-net have breakthrough unit called AN-SDH63, which is just 1U high, and can send 63E1 over the same 䘄ber. Related links: MiniSDH systems (<63 E1, V.35, ETH) MicroSDH Systems (1 E1 / 1 V35) MetroSDH systems (<252 E1, V35, ETH) n x E1 G.703 series FOM’s n x E1 G.703 + Ethernet series FOM’s Fiber Multiplexer
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Testimonials Somkid – Thailand
Before place the orders, our main concern was if those really are reliable enough products for our customers. As a result we found, that there is no customer complaint. In my memory, most preferable feature for the products are it’s management system Another special bene䘄ts about those products are for the media converters being able to use as standalone or chassis type same time We will de䘄nitely recommend AD-net products to other.
Ilan – Israel
Our main concern before ordering products was the longevity and quality. product works good. We will consider more of your products in my projects at the moment I don’t 䘄nd anything to add your service and were good
Topics in Our Blog
101 advantages of 䘄ber cabling
cabling design cabling issues cabling standards cabling system copper 101 E1 multiplexer
EDFA ethernet Ethernet Extender FTTx management gepon onu
䘄ber 101 䘄ber media converters
䘄ber network concepts
e1 over ip
䘄ber optic cables FTTx FTTx basics FTTx design
GPON GPON basics HDSL history LAN extender networking equipment OLT ONT ONU P2P 䘄ber links ive optical network SDH SDH vs PDH TDMoIP
TDM over IP Troubleshooting utp cables VDSL video over e1 video over 䘄ber WDM (Wavelength Division Multiplexing) wireless xDSL
FAQ Frequently Asked Questions: Question: How do I place the order? Answer: Request the price online, mention order quantity, talk to sales now and choose the … Read More
WARRANTY We strive to provide best quality of units in a market, and employ sophisticated Quality Control procedures. But well, it sometimes happens though, it... Read More
RECENT BLOG POST Mar
13
Cut-through and store-and-forward switching Goal of this article is to de䘄ne latency requirements of th [...] Published By
http://www.adnet.com.tw/whatissdhandwhatisthedifferencebetweensdhandpdh/
2/3
3/16/2017
What is SDH and what is the difference between SDH and PDH? | Home 2017
Elements of a Successful Cabling Installation
Feb
Many factors a៚�ect success of the cabling system design and [...]
22
Published By
2017
101 of Microwave Communication Systems
Dec
It is fairly easy to spot system that is using microwave com [...]
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Radio Frequency Systems
Nov
RF (Radio Frequency) systems relies on radio waves for data [...]
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QUICK QUERY Name * Phone Number Email * Your Message
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What is SDH and what is the difference between SDH and PDH? | Home Us
AD-net Logo
Blog
Search
Menu
Home
HOME
About AD-net
RESEARCH
Products
Us
Blog
WHAT IS SDH AND WHAT IS THE DIFFERENCE BETWEEN SDH AND PDH?
Aug
12 2008
What is SDH and what is the di៚�erence between SDH and PDH?
Summary: SDH is very useful equipment that is used for the telecommunication sector in easy transfer of data. Earlier PDH was widely used but due to some of its weaknesses, SDH has replaced the use of PDH. But not everywhere. Point to Point applications are still used mainly by PDH, and also, it’s cheaper. PDH or the plesiochronous digital hierarchy is a popular technology that is widely used in the networks of telecommunication in order to transport the huge amounts of data over the digital equipment for transportation like microwave radio or 䘄ber optic systems. The term plesiochronous has been derived from the Greek work ‘plesio’ that means ‘near’ and ‘chronos’ meaning time. This means that the PDH works in a state when the various di៚�erent parts of a network are clearly synchronized. But with the change in technology, the PDH is now being replaced by the SDH or what is popularly called as synchronous digital hierarchy. The SDH is useful equipment that is used in most of the telecommunications networks. This PDH helps in proper transmission of the data that generally runs at the similar rate but allows some slight variation in the speed than the nominal rate. The basic transfer rate of the data is 2048 kilobits per second. For instance, in each speech transmission, the normal rate breaks into di៚�erent thirty channels of 64 kilobits per second along with two di៚�erent 64 kilobits per second in order to perform the tasks of synchronization and signaling. The typical rate of transmitting the data over the 䘄ber optic systems is 565 Mbit/sec in order to transport the data in the long distance. But as the technology has improved with the ing of time, now the telecommunication companies have replaced the PDH equipment with that of the SDH equipment, which has the capability of transmitting the data at much higher rates as compared to the PDH system. The SDH is an international standard that is highly popular and used for its high speed data transfer of the telecommunication and digital signals. This synchronous system has been specially designed in order to provide a simple and 䘄exible network infrastructure. This system has brought a considerable amount of change in the telecommunication networks that were based on the optical 䘄bers as far as performance and cost were concerned. The weaknesses that PDH faced paved way for the introduction and use of the SDH systems. Although the PDH proved to be a breakthrough in the 䘄eld of digital transmission, the weaknesses that made it less demanded includes: 1. Asynchronous structure that is rigid. 2. Restricted management capacity. 3. Non availability of world standard on the digital formats. 4. No optical interfaces world standard and without an optical level, networking is not possible. But if we compare the PDH system with that of the SDH system, the latter one has a large number of advantages. Some of the most common advantages enjoyed by the usage of SDH include: 1. optical interfaces 2. capability of powerful management 3. world standard digital format 4. synchronous structure is 䘄exible 5. cost e៚�ective and easy tra鄅c cross connection capacity and add and drop facility 6. reduced networking cost due to the transversal compatibility 7. forward and backward compatibility Apart from all the advantages mentioned above, the SDH also has various management capabilities such as performance management, security and access management, con䘄guration management and the event or the alarm management. So, we can clearly make a distinction between http://www.adnet.com.tw/whatissdhandwhatisthedifferencebetweensdhandpdh/
1/3
3/16/2017
What is SDH and what is the difference between SDH and PDH? | Home
the PDH and SDH systems so that as per the needs of the telecommunication, the appropriate transmission system can be used. Please note also, that PDH, if we talk as n x E1 G.703 lines to be transmitted, can be developed only up to 16 E1 lines – 34 Mbit/s. But SDH – can reach 155 Mbit/s, which corresponds to STM-1, can reach 622 Mbit/s – STM-4. Good example of PDH 䘄ber multiplexer is this product. However, it has to be noted. that AD-net has done a huge work bridging the gap between SDH and PDH systems, o៚�ering customers a SDH systems – particulary from miniSDH and microSDH range, and – close to PDH price! For example, most of the suppliers, if we talk about more than 16E1 – are not able to o៚�er units at reasonable price and still 1U or even 2U high. AD-net have breakthrough unit called AN-SDH63, which is just 1U high, and can send 63E1 over the same 䘄ber. Related links: MiniSDH systems (<63 E1, V.35, ETH) MicroSDH Systems (1 E1 / 1 V35) MetroSDH systems (<252 E1, V35, ETH) n x E1 G.703 series FOM’s n x E1 G.703 + Ethernet series FOM’s Fiber Multiplexer
PREVIOUS
NEXT
Testimonials Somkid – Thailand
Before place the orders, our main concern was if those really are reliable enough products for our customers. As a result we found, that there is no customer complaint. In my memory, most preferable feature for the products are it’s management system Another special bene䘄ts about those products are for the media converters being able to use as standalone or chassis type same time We will de䘄nitely recommend AD-net products to other.
Ilan – Israel
Our main concern before ordering products was the longevity and quality. product works good. We will consider more of your products in my projects at the moment I don’t 䘄nd anything to add your service and were good
Topics in Our Blog
101 advantages of 䘄ber cabling
cabling design cabling issues cabling standards cabling system copper 101 E1 multiplexer
EDFA ethernet Ethernet Extender FTTx management gepon onu
䘄ber 101 䘄ber media converters
䘄ber network concepts
e1 over ip
䘄ber optic cables FTTx FTTx basics FTTx design
GPON GPON basics HDSL history LAN extender networking equipment OLT ONT ONU P2P 䘄ber links ive optical network SDH SDH vs PDH TDMoIP
TDM over IP Troubleshooting utp cables VDSL video over e1 video over 䘄ber WDM (Wavelength Division Multiplexing) wireless xDSL
FAQ Frequently Asked Questions: Question: How do I place the order? Answer: Request the price online, mention order quantity, talk to sales now and choose the … Read More
WARRANTY We strive to provide best quality of units in a market, and employ sophisticated Quality Control procedures. But well, it sometimes happens though, it... Read More
RECENT BLOG POST Mar
13
Cut-through and store-and-forward switching Goal of this article is to de䘄ne latency requirements of th [...] Published By
http://www.adnet.com.tw/whatissdhandwhatisthedifferencebetweensdhandpdh/
2/3
3/16/2017
What is SDH and what is the difference between SDH and PDH? | Home 2017
Elements of a Successful Cabling Installation
Feb
Many factors a៚�ect success of the cabling system design and [...]
22
Published By
2017
101 of Microwave Communication Systems
Dec
It is fairly easy to spot system that is using microwave com [...]
12
Published By
2016
Radio Frequency Systems
Nov
RF (Radio Frequency) systems relies on radio waves for data [...]
24
Published By
2016 Read All
QUICK QUERY Name * Phone Number Email * Your Message
Stay in touch via e-mail newsletter! Subscribe to our mailing list for weekly performance tips Email
Home
About
Products
& s
Switches Unmanaged series Fiber Optical Switches Fast Ethernet managed series Gigabit Ethernet managed series
http://www.adnet.com.tw/whatissdhandwhatisthedifferencebetweensdhandpdh/
3/3
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