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3300 ICP Hardware User Guide
82 Release 3.3
Operation
The DNI line card provides full duplex digital transmission of both voice and data. The DNI line
card is a "smart" card capable of downloading information to and from peripheral devices.
ONS Line Card
The ONS line card connects up to 16 standard telephone sets with line loop resistances usually
not exceeding 400 ohms. As such, the ONS line card is used to connect internal telephone
extensions close to the system. The ONS line card installs in any Peripheral Interface card slot,
and is hot-swappable.
ONS Line Card Specifications (all variants)
Features Provided: Interface for MITEL digital telephone sets, and attendant consoles
2-wire / 4-wire conversion
full DX chip on-board
high-level data link controller (HDLC) on-board
32 K of on-board RAM memory
16 K of on-board PROM
self-test capability, including power-up diagnostics
automatic card identification
Compliance to Standards: Meets all ONS-type requirements for North America and the
United Kingdom meets Harmful Voltages requirement of
POR1065.
Note: The following variants apply to the ONS and ONS CLASS/CLIP line cards.
Number of Circuits per Card: 16 ONS circuits
Loop Detector Threshold: 15 mA (+1 mA) (ONS line card)
13 mA (+1 mA) (ONS CLASS/CLIP line card)
Trip Battery Ringing Interval: -48 Vdc nominal
Bridged Ringers: 5 (C4 or equivalent)
Features Provided: 2-wire/4-wire conversion
A-D/D-A conversion
DC loop supervision and dial pulse collection
ringing and ring trip detection up to 5 telephones per circuit
ground button detection
self-test capability
automatic card identification
constant current feed