Maxim DS33Z41 Especificações descarregar pdf (Página 3)

Section 7. Design Kit Questions

How can I get the most updated definition files for the T1E1DK?

What software is available for Maxim telecommunication design kits?

What telecommunication design kits are currently available from Maxim?

When designing a board with a Maxim telecommunication device, is there any restriction on PCB trace length from

the device to the transformer?

Section 8. TDM-over-Packet (TDMoP) Questions

What is the difference between VoIP and TDMoIP?

What is the difference between MII and RMII, and how do they relate to products like DS34T108?

What is a bundle in TDMoIP products?

I am getting bit errors with the DS34T108 in E1 internal mode when I use all 8 ports. All other modes operate

correctly. What is the cause of the errors, and is there a solution?

What kind of OAM packets are supported by TDMoP product support?

What is ARP and how does it work on Maxim TDMoP devices?

What are the ground considerations when using an Ethernet PHY interface?

Can you define the Stratum level for TDMoP devices?

What is the difference between TIE and MTIE?

10.

How can the user send OAM packets using the DS34T108?

11.

How do you find the correct jitter buffer index for a bundle in Maxim TDMoP devices?

12.

What are the external SDRAM memory maps for the DS34T10x and DS34S10x TDMoP devices?

1. General Telecommunication Questions

Q1. In T1, what is the difference between superframe (SF)/D4 and extended superframe (ESF)?

A1. While both formats contain the same number of channel time slots, the SF format is a 12-frame structure, while ESF

contains 24 frames. Both use the 8th bit of each channel time slot in every 6th frame for signaling, thus providing the SF

format with A/B signaling bits and the ESF format with A/B/C/D signaling bits every multiframe. Also, the ESF format uses

the F bits to provide frame alignment, CRC-6 check bits, and a 4kbps data link. The SF format divides the F bits into Ft

and Fs bits. The Ft bits are terminal-framing bits that identify frame boundaries, and the Fs bits are signaling-framing bits

that identify signaling frames.

Q2. What is the difference between T1 and E1?

A2. The main differences between T1 and E1 are the operating frequency, the number of time slots, the pulse shape, the

characteristic line impedance, and the signaling method. The T1 system operates at 1.544MHz with a total of 24 time

slots. The T1 pulse shape contains overshoot and undershoot and is driven on a line impedance of 100Ω. Finally, digital

messages to signal on/off-hook or other conditions are sent using robbed-bit signaling. The E1 system operates at

2.048MHz with a total of 32 time slots. The E1 pulse shape is a perfectly rectangular pulse shape and is driven on a line

impedance of 120Ω or 75Ω. Finally, digital messages to signal on-/off-hook or other conditions are sent using channel-

associated signaling.

Q3. What is the difference between T1 and J1?

A3. J1 commonly refers to the derivation of the North American T1 standard that is used exclusively in Japan. Differences

exist between J1 and T1 in the yellow alarm generation for superframe (SF) and extended superframe (ESF) modes. Also,

the CRC-6 calculation in ESF mode is different. In J1 SF mode, the yellow alarm is generated when a '1' is transmitted in

the 12th F-bit, as opposed to T1 SF mode in which a '0' is transmitted in the 2nd bit of all timeslots. In J1 ESF mode, the

yellow alarm is generated by transmitting 'FFFF' in the data link (DL) section of the F-bits, as opposed to T1 ESF mode in

which 'FF00' is transmitted in the data link. In J1 ESF mode the CRC-6 calculation includes the frame alignment signal and

data link F-bits. However, for T1, all of the F-bits are set to '1' when the CRC-6 calculation is performed.

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