what is advantages and disadvantages between NG-SDH and PTN

liqiang185 · Created Dec 14, 2021 06:27:08

Posted by amir13550 at 2021-12-14 05:44 thank you , please let me know if there is a good reason to chose NG-SDH in Power field

Teleprotection Principles

Teleprotection is classified into transmission line protection and main device protection (such as generators, transformers, and bus bars). Main device protection is intra-site protection and requires only intra-site communication. Power line protection can be overcurrent protection or pilot protection (such as distance protection and differential protection), depending on protection mechanisms. Differential protection is the main requirement for the communication network SLA.

Requirements of Differential Protection on Communication Networks

The differential protection device divides the round-trip delay (RTD) by 2 to obtain the one-way delay (OWD), adjusts the sampling pulse based on the delay, and calculates a differential flow every 24 frames (0.833 ms x 24). If the calculated differential flow exceeds the threshold, the channel will be locked. Therefore, differential protection has the following requirements on communication networks:

The forward and backward paths are strictly consistent.
Differential protection devices determine the current sampling interval based on the transmission delay. If the forward and backward paths are inconsistent, the calculated unidirectional channel delay is incorrect, resulting in sampled data errors. When the calculated current difference exceeds the threshold, the differential protection devices automatically shut down the transmission line for protection, causing blackouts.
The service interruption time in the case of trail changes is longer than 100 ms.
When detecting an exception on the working trail, differential protection devices switch services to the protection trail. If the service trail change time is less than 100 ms, the differential protection devices cannot detect the change and still sample data at the interval before the change. As a result, the sampled data is incorrect. When the current difference exceeds the threshold, the differential protection devices automatically shut down the transmission line for protection, causing blackouts.
The OWD is less than 10 ms.
To meet the buffer limit requirements of differential protection devices, the OWD must be less than 10 ms.

Differential Protection Switching Principles

Figure 2-1 shows the teleprotection process.

In normal cases, NE1 and NE2 are connected to the teleprotection control device through PCM interfaces (2M optical interfaces, C37.94, and codirectional 64 kbit/s). The teleprotection device exchanges information in real time through the transmission device.
When a fault (such as a power line fault) occurs at position 1, the fault is transmitted to both ends.
The teleprotection device at position 2 compares the current value detected by the local device in real time with the current value sent by the peer device. If they are inconsistent, the two ends turn off the switch to isolate the faulty part from the power system.

Figure 2-1 Teleprotection principles
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liqiang185 · Created Dec 13, 2021 09:07:19

Dear friend!
The biggest difference between them is that they use different data exchange technologies. The PTN equipment uses IP and MPLS-based Layer 2 and Layer 3 switching technologies for data transmission. NG-SDH is a TDM switching technology that uses timeslots as the core for data transmission.

The SDH service exclusively occupies the channel. When the user does not transmit data, the channel is always idle. As a result, bandwidth resources are wasted. PTN services share bandwidth resources. However, during peak hours, network congestion may occur.

Generally, SDH is suitable for energy, finance, transportation, and defense. The PTN is suitable for Internet access and telephone communication for the general public.

Thank you!

liqiang185 · Created Dec 13, 2021 09:07:19

Dear friend!
The biggest difference between them is that they use different data exchange technologies. The PTN equipment uses IP and MPLS-based Layer 2 and Layer 3 switching technologies for data transmission. NG-SDH is a TDM switching technology that uses timeslots as the core for data transmission.

The SDH service exclusively occupies the channel. When the user does not transmit data, the channel is always idle. As a result, bandwidth resources are wasted. PTN services share bandwidth resources. However, during peak hours, network congestion may occur.

Generally, SDH is suitable for energy, finance, transportation, and defense. The PTN is suitable for Internet access and telephone communication for the general public.

Thank you!

amir13550 · Created Dec 13, 2021 09:23:11

Dear
thanks but I want to know more and for which reasons customer is better to chose NG-SDH or chose PTN

Malik3000 · Created Dec 13, 2021 09:25:09

PTN

that means the Tributary boards and line boards are Ethernet , and the cross-connect boards supports matrix in packet based way.

the PTN uses packet between NEs so they could work in either (Native Ethernet or MPLS) .

- to send TDM over PTN , you must use MPLS and use PW technology to send TDM over Ethernet .

- In PTN you can use protection related of Etherner like ERPS,MRPS,LAG,MCLAG,....

NG-SDH

-that means the Tributary boards and line boards are SDH , and the cross-connect boards supports matrix in VC12,3,4 only.

the SDH sends TDM and if need to transmit Ethernet you need to use EOS technology and boards to sends Ethernet .

in NG-SDH you can use protection related to SDH like 1+1 MSP , 2F/4F MSP, SNCP

amir13550 · Created Dec 14, 2021 05:44:49

Posted by liqiang185 at 2021-12-13 09:07 Dear friend!The biggest difference between them is that they use different data exchange technologie ...

thank you , please let me know if there is a good reason to chose NG-SDH in Power field

liqiang185 · Created Dec 14, 2021 06:27:08

Posted by amir13550 at 2021-12-14 05:44 thank you , please let me know if there is a good reason to chose NG-SDH in Power field

Teleprotection Principles

Teleprotection is classified into transmission line protection and main device protection (such as generators, transformers, and bus bars). Main device protection is intra-site protection and requires only intra-site communication. Power line protection can be overcurrent protection or pilot protection (such as distance protection and differential protection), depending on protection mechanisms. Differential protection is the main requirement for the communication network SLA.

Requirements of Differential Protection on Communication Networks

The differential protection device divides the round-trip delay (RTD) by 2 to obtain the one-way delay (OWD), adjusts the sampling pulse based on the delay, and calculates a differential flow every 24 frames (0.833 ms x 24). If the calculated differential flow exceeds the threshold, the channel will be locked. Therefore, differential protection has the following requirements on communication networks:

The forward and backward paths are strictly consistent.
Differential protection devices determine the current sampling interval based on the transmission delay. If the forward and backward paths are inconsistent, the calculated unidirectional channel delay is incorrect, resulting in sampled data errors. When the calculated current difference exceeds the threshold, the differential protection devices automatically shut down the transmission line for protection, causing blackouts.
The service interruption time in the case of trail changes is longer than 100 ms.
When detecting an exception on the working trail, differential protection devices switch services to the protection trail. If the service trail change time is less than 100 ms, the differential protection devices cannot detect the change and still sample data at the interval before the change. As a result, the sampled data is incorrect. When the current difference exceeds the threshold, the differential protection devices automatically shut down the transmission line for protection, causing blackouts.
The OWD is less than 10 ms.
To meet the buffer limit requirements of differential protection devices, the OWD must be less than 10 ms.

Differential Protection Switching Principles

Figure 2-1 shows the teleprotection process.

In normal cases, NE1 and NE2 are connected to the teleprotection control device through PCM interfaces (2M optical interfaces, C37.94, and codirectional 64 kbit/s). The teleprotection device exchanges information in real time through the transmission device.
When a fault (such as a power line fault) occurs at position 1, the fault is transmitted to both ends.
The teleprotection device at position 2 compares the current value detected by the local device in real time with the current value sent by the peer device. If they are inconsistent, the two ends turn off the switch to isolate the faulty part from the power system.

Figure 2-1 Teleprotection principles
download?uuid=0ea0b5f1b3ba450ba85a3241ce551fc0

amir13550 · Created Dec 14, 2021 07:48:36

thank you very much

what is advantages and disadvantages between NG-SDH and PTN

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Teleprotection Principles

Requirements of Differential Protection on Communication Networks

Differential Protection Switching Principles

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Teleprotection Principles

Requirements of Differential Protection on Communication Networks

Differential Protection Switching Principles

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what is advantages and disadvantages between NG-SDH and PTN

Best answer

Teleprotection Principles

Requirements of Differential Protection on Communication Networks

Differential Protection Switching Principles

Recommended answer

Teleprotection Principles

Requirements of Differential Protection on Communication Networks

Differential Protection Switching Principles

Third Party’s Trade Secret

My Followers