Chapter 4. - Installing Additional Cabinets Section 300-Installation4-36 DBS 576 (USA), issued 6/2/98 576-13-300Restriction on Number of CardsNote that only a limited number of PRI/23, T1, and CONF cards can be installed inthe flexible slots (FS). Do not attempt to install more than the prescribed maximums.PRI/23/T1 CardThe switches on the PRI/23 card (see page 2-31), the T1 card (see page 2-33) and thesettings described in the Programming Manual (Section 400) allow you to select 8,16 or 24 communication channels.Because each flexible slot can handle a maximum of 8 channels, two or moreflexible slots are effectively occupied per card if you set 16 or more channels. In thiscase, certain slots must be left vacant.The following table shows which slots cannot be used according to the number of setchannels. Do not attempt to install any cards in the unusable slots.Table 4-2. PRI/23 and T1 card limitationsNote: The PRI/23 card can only be set for 8 channels or 24 channels whenused for S-point (extension) connections.Figure 4-35. Restriction on PRI/23 and T1 cards installed in flexible slots of DBS 576Channels Card installationpositionUnusable slotsFS1 installed FS5 installed FS9 installed8ch FS1 to FS12 No limit16ch FS1, FS5 or FS9 FS2 FS6 FS1024ch FS2 to FS3 FS6 to FS7 FS10 to FS11
