Physical Description - Nortel Circuit Card Installation Manual

Page 390 of 906

Physical description

553-3001-211 Standard 3.00
NT6D80 MSDL card
that support the same functions. For example, three cards supported with the
MSDL (NT6D80) are QPC757 (DCHI), QPC513 (ESDI), QPC841 (SDI) and
NTSD12 (DDP).
Though the MSDL is designed to coexist with other cards, the number of
ports supported by a system equipped with MSDL cards is potentially four
times greater than when using other cards. Since each MSDL has four ports,
representing a single device, a system can support as many as 16 MSDL cards
with a maximum of 64 ports.
The MSDL card is a standard size circuit card that occupies one network card
slot and plugs into the module's backplane connector to interface with the
CPU bus and to connect to the module's power supply. On the faceplate, the
MSDL provides five connectors, four to connect to I/O operations and one to
connect to a monitor device that monitors MSDL functions. Figure 82 on
page 391 illustrates major MSDL components and their locations on the
printed circuit card.
Note: Switches S9 and S10 are configured to reflect the device number
set in LD 17 (DNUM). S10 designates tens, and S9 designates ones. For
example, set device number 14 with S10 at 1 and S9 at 4.
August 2005