Chapter 7 - System Controller Cards; Expansion Daughterboards - Meridian Nortel 1 Option 11C Technical Reference Manual

Page 210 of 544

Expansion Daughterboards.

553-3011-100 Standard 14.00
System Controller cards
The NTDK20 SSC card is equipped with 8 Mbytes of temporary memory
space called DRAM. DRAM functions much like RAM on a computer
system, whereby system and user files are stored while the system is up and
running. DRAM on the Option 11C stores operating system files, overlay
data, patch codes, and the active copy of the customer database.
Expansion Daughterboards mounted on the NTDK20 SSC card (Figure 22 on
page 215) allow the connection of the main cabinet to expansion cabinets in
multi cabinet Option 11C systems. Each port on each daughterboard also
provides an additional 16-channel conference loop and up to 3 SDI ports on
the expansion cabinet. Table 67 provides the ports, cables and connection
data on the expansion daughterboards. A description of and purpose for each
daughterboard is given below:
• The NTDK22 Expansion Daughterboard is used when the expansion
cabinet is within 10 m (33 ft.) of the main Option 11C cabinet. It connects
to one A0618443 Fiber Optic plastic cable.
One of these boards is required for each expansion cabinet located within
10 m (33 ft.) of the main cabinet that is to be connected using the
A0618443 Fiber Optic plastic cable.
• The NTDK84 Expansion Daughterboard has the same features as the
NTDK22 except that it can interface with two expansion cabinets.
• The NTDK24 Expansion Daughterboard is used when the expansion
cabinet is up to 3 km (1.8 mi.) of the main cabinet. It connects to one
glass multi-mode fiber optic cable which is dedicated to the Option 11C
system.
One NTDK24 daughterboard is required for each expansion cabinet
located up to 3 km (1.8 mi.) of the main cabinet.
• The NTDK85 Expansion Daughterboard has the same features as the
NTDK24 except that it can interface with two expansion cabinets.
• The NTDK79 Expansion Daughterboard provides the same functions as
the NTDK24 except that it connects to Single Mode glass fiber optic
cable.
January 2002