Specifications

General Information Guide
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Digital Service Unit
A DSU cabinet holds up to four DSU cards and two FIMs. The DSU cards provide digital trunk
interfaces for public or private network access and specialized digital functions (such as messaging
and ISDN service). The FIMs support the transmission of voice and data signals between the DSU
and the 3300 controller.
DSU cards include:
• DS1 Formatter
• CEPT Formatter
• E1/T1 Digital Trunk Formatter
• BRI Card (6 circuit)
• BRI Card (15 circuit)
• Euro PRI Card
• NA PRI Card
• R2 card.
For detailed information on the hardware specifications, refer to the 3300 ICP Hardware User Guide.
Peripheral Unit
Each peripheral unit holds up to 12 Peripheral Interface Cards and provides up to 192 ONS or DNI
ports. A slave cabinet can be added that expands the unit up to a total of 384 ports and 24 Peripheral
Interface cards (the number of voice channels remains the same). One Peripheral Switch Controller
(PSC) card and one Fiber Interface Module (FIM) is installed in the master cabinet of each peripheral
unit. The PSC card provides control for all Peripheral Interface cards, and a fiber optic cable connects
the FIM to the 3300 controller.
Peripheral Interface Cards available include:
• DNI Line Card
• LS/GS trunk card
• ONS CLASS/CLIP Line Card
• ONS Line
• E&M Tie trunk
• OPS Line
• DID/Loop Tie trunk
For detailed information on the hardware specifications, refer to the 3300 ICP Hardware User Guide.