Nortel Meridian 1 option 11C Planning And Installation Manual page 24

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Thirty conference channels are provided by the NTDK20 SSC card.
Conference capability is increased when Fiber Expansion Daughterboards are
added to the NTDK20 SSC card to connect to expansion cabinets, see
Figure 5 on page 25. Each port on the Fiber Expansion Daughterboard
increases the total number of conference channels by 16.
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The NTDK20 SSC card provides the following Digitone and other tone
related functions:
• 30 channels of tone and digit switch (TDS) and a combination of eight
Digitone receivers (DTR) or dial tone detectors (XTD)
• Tone service ports which can be configured as either four units of
MFC/MFE/MFK5/MFK6/MFR or eight DTR/XTD units.
An NTAK03 card can be installed in the main cabinet if additional tone
receiver and transmission resources are required.
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