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NEC ND-70919 system manual Clock Signal Synchronization Test

Models: ND-70919

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CHAPTER 5 OPERATION TEST

PLO Operation Test

Clock Signal Synchronization Test

This test checks to see if the PLO keeps synchronizing with the external clock signals, when the external clock signals from network has input again after it has stopped once. Do the following procedure using “In Service” transmission lines.

(1)When providing one clock supply route

STEP 1: On the DTI0/PRT0/BRT0 card extracting clock signals, set the switches as follows to stop the external clock signal input:

• 30DTI0 card:

SW-1 and SW-2 to OFF

• PRT0/24DTI0 card:

SW0-1 and SW0-2 to OFF

• BRT0 card:

SW0-2 and SW0-3 to OFF

• 2BRT0 card:

SW11-2 and SW11-3 to OFF

–The CLK lamp on the MP card goes out. STEP 2: Originate an outgoing call via trunk.

STEP 3: After an outgoing connection via trunk has been established, confirm interoffice synchronization and speech quality as follows:

•On the DTMF telephone set, keep pressing any dial button.

•Check to see if noise periodically occurs on the DTMF signals coming from the calling station in the opposite office.

•Do the above test again in the opposite direction.

STEP 4: On the DTI0/PRT0/BRT0 card, restore the switches as the state before testing to input

the external clock signals:

 

• 30DTI0 card:

SW-1 to ON, SW-2 to OFF

• PRT0/24DTI0 card:

SW0-1 to ON, SW0-2 to OFF

• BRT0 card:

SW0-2 to ON, SW0-3 to ON

• 2BRT0 card:

SW11-2 to ON, SW11-3 to ON

–The CLK lamp on the MP card lights. STEP 5: Originate an outgoing call via trunks.

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NEAX2000 IVS2 ISDN System Manual

ND-70919 (E), Issue 1.0

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NEC ND-70919 system manual Clock Signal Synchronization Test
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ND-70919 specifications

The NEC ND-70919 is a versatile and highly regarded optical disc drive that has made significant contributions to the storage technology sector. Recognized for its durability and performance, the ND-70919 is primarily designed for users looking for a reliable solution for CD, DVD, and even Blu-ray media playback and recording.

One of the hallmark features of the NEC ND-70919 is its exceptional writing speeds. This drive is capable of burning CD-R media at speeds up to 48x, DVD+R and DVD-R at up to 16x, and dual-layer DVD media at speeds of 8x. This not only allows for rapid disc creation but also ensures high-quality data integrity during the writing process. The drive's burning technology uses advanced algorithms to reduce errors, which is crucial for data that needs to be archived.

In terms of playback, the ND-70919 supports a wide variety of formats, including CD, DVD, and various recordable formats. This flexibility ensures that users can access a broad array of media types. The drive's compatibility with both DVD-RAM and DVD+RW formats allows users the convenience to rewrite data and reuse discs, making it a cost-effective choice for those needing frequently updated storage solutions.

The NEC ND-70919 employs the latest in optical technology, featuring a sophisticated laser system that enhances both read and write speeds while also providing error correction capabilities. This technology is particularly beneficial when dealing with scratched or damaged discs, enabling the drive to maintain performance and reliability under various conditions.

Another standout characteristic is its user-friendly interface and installation process. The ND-70919 is designed to be compatible with a variety of operating systems, making it accessible for users across different platforms. It is typically equipped with a SATA interface, which provides a speedy connection to the motherboard, ensuring that data transfer rates meet modern standards.

In terms of physical characteristics, the drive has a slim and compact design, allowing it to fit seamlessly into both desktop and laptop configurations. Its aesthetic appeal is complemented by its robustness, designed to endure repeated use over time.

Overall, the NEC ND-70919 stands out as a functional and powerful optical disc drive, characterized by high writing speeds, broad format compatibility, advanced optical technologies, and ease of use, making it a popular choice among consumers seeking reliable disc storage solutions.