"Pooh Bear" wrote in message

Sander deWaal wrote:

"Arny Krueger" said:

It is said that coaxial has several advantages over ordinary
TOSLINK connections, a greater bandwidth being one of them.

Problem is, coax outputs are generally driver through a special
lossy transformer that rolls response off above about 12 MHz to
reduce EMI.

IIRC, TOSLINK has barely 7 MHz of bandwidth.
Have to look that one up, though. May be old information.

For parts like this - TOTX 111- yes - Toshiba quote 6 MHz in fact


http://www.semicon.toshiba.co.jp/td/..._datasheet.pdf

They quote 10 MHz NRZ data rate for other devices. However, 5 or 10 MHz NRZ
data rate is not the same as a 10 MHz bandpass in the analog sense we used
with coax. It takes more bandpass than just the data rate to transmit a NRZ
singal with low error rates.

Probably the highest audio data rates that are widely used with Toslink
relate to the ADAT data format. Up to 8 24/48 audio channels are transmitted
over a single piece of TOSLink-type audio fiber, for a total data rate of
9,216,000 bps, exclusive of any overhead. Ths compares with 4,608,000 bps
for 24/96 2-channel audio (again exclusive of overhead bits), and
2,304,000 bps for 24/48 audio and DD.

Arny Krueger wrote:

"Pooh Bear" wrote in message

Sander deWaal wrote:

"Arny Krueger" said:

It is said that coaxial has several advantages over ordinary
TOSLINK connections, a greater bandwidth being one of them.

Problem is, coax outputs are generally driver through a special
lossy transformer that rolls response off above about 12 MHz to
reduce EMI.

IIRC, TOSLINK has barely 7 MHz of bandwidth.
Have to look that one up, though. May be old information.

For parts like this - TOTX 111- yes - Toshiba quote 6 MHz in fact


http://www.semicon.toshiba.co.jp/td/..._datasheet.pdf

They quote 10 MHz NRZ data rate for other devices. However, 5 or 10 MHz NRZ
data rate is not the same as a 10 MHz bandpass in the analog sense we used
with coax. It takes more bandpass than just the data rate to transmit a NRZ
singal with low error rates.

You gonna go into 'eye pattern' here ?


Probably the highest audio data rates that are widely used with Toslink
relate to the ADAT data format. Up to 8 24/48 audio channels are transmitted
over a single piece of TOSLink-type audio fiber, for a total data rate of
9,216,000 bps, exclusive of any overhead. Ths compares with 4,608,000 bps
for 24/96 2-channel audio (again exclusive of overhead bits), and
2,304,000 bps for 24/48 audio and DD.

If ADAT was using a TOSLINK device for 9.2Mbps then presumably it wasn't one of the
consumer 5-10 MHz devices.


Graham

"Pooh Bear" wrote in message

Arny Krueger wrote:

"Pooh Bear" wrote in message

Sander deWaal wrote:

"Arny Krueger" said:

It is said that coaxial has several advantages over ordinary
TOSLINK connections, a greater bandwidth being one of them.

Problem is, coax outputs are generally driver through a special
lossy transformer that rolls response off above about 12 MHz to
reduce EMI.

IIRC, TOSLINK has barely 7 MHz of bandwidth.
Have to look that one up, though. May be old information.

For parts like this - TOTX 111- yes - Toshiba quote 6 MHz in fact



http://www.semicon.toshiba.co.jp/td/..._datasheet.pdf

They quote 10 MHz NRZ data rate for other devices. However, 5 or 10
MHz NRZ data rate is not the same as a 10 MHz bandpass in the analog
sense we used with coax. It takes more bandpass than just the data
rate to transmit a NRZ singal with low error rates.

You gonna go into 'eye pattern' here ?


Probably the highest audio data rates that are widely used with
Toslink relate to the ADAT data format. Up to 8 24/48 audio channels
are transmitted over a single piece of TOSLink-type audio fiber, for
a total data rate of 9,216,000 bps, exclusive of any overhead. Ths
compares with 4,608,000 bps for 24/96 2-channel audio (again
exclusive of overhead bits), and 2,304,000 bps for 24/48 audio and
DD.

If ADAT was using a TOSLINK device for 9.2Mbps then presumably it
wasn't one of the consumer 5-10 MHz devices.

I don't know.