View source for DS-30X

{{Infobox interface
| name        = DS-30X
| media       = Copper
| nbr_signals = 4
| symbol_rate = 2.56 MBaud
| variants    = [[DS-30]], [[DS-30A]], [[DS-30Y]]
}}
DS-30X Speech Links are used to carry speech and some signalling on Norstar Modular platforms.

== Physical ==
* Four wires (arrows are controller <-> card) <ref name="ds30xphy">[[File:NN43001-311_02.09_Installation_CirCrdFundamentals.pdf|page=25|25px]] CS1000 Circuit Card Fundamentals, Page 25</ref>
** Tx PCM &rarr;
** Rx PCM &larr;
** 5.12MHz Clock &rarr;
** 1kHz Frame Sync &rarr;

== Electrical ==
* Signal levels unknown
* Isolation unknown

== Logical ==
* Clocked at 2.56MHz (half the 5.12MHz clock received from the controller)
* Carries 32 channels of PCM voice data
* Each channel consists of a 10-bit word
** 8 bits of voice data (called a "timeslot")
** 1 bit of signalling data
** 1 bit indicating "data valid"
* Signalling data is sent in 24-bit words, one bit at a time in each channel.
** Sent in both directions, one on Tx PCM and one on Rx PCM

== Timing Diagram/Frame Format ==
<wavedrom>
{signal: [
  {name: 'Frame Sync', 	wave: '1....h......'},
  {
    name: 'Data Words',
    wave: '============',
    data: ['Ch 27', 'Ch 28', 'Ch 29', 'Ch 30', 'Ch 31', 'Ch 0', 'Ch 1', 'Ch 2', 'Ch 3', 'Ch 4', 'Ch 5', 'Ch 6'],
    node: '.....AB.....',
  },
  {node: '.C.........D'},
  {name: '5.12MHz', 	wave: 'p.......................', period: 0.5},
  {name: '2.56MHz', 	wave: 'p...........'},
  {name: 'Frame Sync', 	wave: '1nh.........', phase: 1.1},
  {
    name: 'Data Bits',
    wave: '533333333453',
    data: ['Ch31 DV', 'Ch0 Bit7', 'Ch0 Bit6', 'Ch0 Bit5', 'Ch0 Bit4', 'Ch0 Bit3', 'Ch0 Bit2', 'Ch0 Bit1', 'Ch0 Bit0',
           'Ch0 Sig', 'Ch0 DV', 'Ch1 Bit7']
  },
  {node: '.E.........F'},
],
 edge: [
 	'A-C', 'B-D', 'C-E', 'D-F',
 ],
 foot: {
   	text: ['tspan', 'Sig = Signalling Bit, DV = Data Valid Bit']
 },
 config: {
	hscale: 2
 }
}
</wavedrom>

== References ==
<references />

[[Category:Interfaces]]