Nortel Meridian 1 option 11C Planning And Installation Manual page 299

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The minimum system port configuration for Option 11C is 3 SDI ports, all of
which can be found on the NTDK20 System Controller card.
You can obtain additional ports by installing an NTAK02 SDI/DCH circuit
card. The SDI/DCH card has 4 serial I/O ports with three possible
configurations:
• 2 asynchronous ESDI ports with 2 DCHI ports
• 2 synchronous ESDI ports, or
• 2 SDI ports.
The default SDI port configuration is shown below. The value for "XX" is set
on the faceplate of the CPU/CONF circuit card.
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The pre-configured modem port allows the remote maintenance modem to be
connected with further system programming. This port is pre-configured as
TTY 0 (port 0 on the System Controller card) and is programmed for
Maintenance (MTC), Service Change (SCH) and BUG messages.
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