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Specifications
Release 3.3 81
Operation
The DID/LT trunk card is software-controlled by the Main Controller. The DID/LT trunk card can
maintain voice and data communications through four trunks supported by the DID/LT trunk
card in both incoming and outgoing modes. For example, the DID/LT trunk card interfaces
incoming DID trunks from a CO, and incoming and outgoing trunks between co-related systems.
Any combination of these applications can be handled by the DID/LT trunk card.
DNI Line Card
The Digital Network Interface (DNI) Line Card provides 16 voice and data lines. The DNI line
card provides an interface for MITEL digital network devices including SUPERSET telephones,
and attendant consoles.
The DNI line card features devices that are compatible with MITEL SUPERSWITCH™ DIGITAL
NETWORK (MSDN) data transmission protocols. MSDN technology allows simultaneous
2-way transmission of digitized voice and data over a twisted copper pair. The DNI line card
supports voice/data transmission at the rate of 128 kb/s (64 kb/s on each of two voice channels)
and 16 kb/s on one signaling channel over a loop length of up to 1000 meters (using 24 - 26
AWG wire (25 - 27 IWG)).
DNI Line Card Specifications
Features Provided: 2-wire/4-wire conversion
A-D/D-A conversion
address signaling: MF-R1, DTMF or dial pulse
incoming/outgoing/both way selection
independent gain control for incoming and outgoing mode
software-selectable balance networks
tip ground and ring ground sensing
protection/isolation against foreign potentials
forward/reverse loop voltage sensing
incoming DC loop supervision and debounced dial pulse
collection
incoming forward or reverse battery feed
battery/ground pulsing (optional)
backwards busying
self-test capability
automatic card identification
Compliance: Complies with all pertinent sections of EIA Standard RS-464.
Number of Circuits per Card: 16 DNI circuits (up to 32 channels)
Power Consumption: 17.24 watts
External Loop Length: Up to 1000 meters; 24 or 26 AWG (25 or 27 IWG) twisted pair,
including up to 50 meters (162.5 ft) 22 AWG (23 IWG) quad wire
and up to 3 m modular line cord without bridge taps.
External Loop Resistance: 300 ohms
Data Error Rate: Better than 1 in 10,000,000 bits, in the presence of an interfering
signal (ringing).