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3300 ICP Hardware User Guide
84 Release 3.3
connected. Outgoing calls are converted from PCM digital signals to analog signals by one of
the 16 line circuit modules on the ONS line card. Calls are switched by the Main Controller and
the two parties connected.
All signals are passed through the 2-wire to 4-wire hybrid circuit on the line circuit module. The
line busy status LED remains lit while the call is in progress. When calls are terminated, receipt
of an on-hook condition turns off the line status LED. The call is disconnected from the circuit
switch and the line circuit reverts to an idle condition.
The ONS line card provides for “Ground button” signaling. A ground button, on a telephone
extension so equipped, provides a means of connecting ground to the ring lead. In addition to
ground button support, the ONS line card features a calibrated flash function. Unlike telephone
installations using ground button signaling, telephone extensions using calibrated flash
signaling do not require a third wire connected to ground. Calibrated flash is also the only
method recognized internationally for recall simulation. The minimum calibrated flash duration
that can be detected by the ONS line card is 40 milliseconds.
ONS CLASS/CLIP Line Card
The ONS CLASS/CLIP line card supports the same functionality as the ONS line card, but also
provides CLASS/CLIP functionality when enabled by the software. The ONS CLASS line card
is available in North America, and the ONS CLIP line card is available in the UK. The ONS
CLASS/CLIP line card installs in any Peripheral Interface card slot, and is hot-swappable.
ONS CLASS Line Card Specifications (North America)
The ONS CLASS line card (NA) supports ONS CLASS sets (NA) that meet the following
specifications:
- ANSI/TIA/EIA-716 Standard "Telecommunications Telephone Terminal Equipment - Type
1 Caller Identity Equipment Performance Requirements"
- ANSI/TIA/EIA-777 Standard "Telecommunications Telephone Terminal Equipment - Type
2 Caller Identity Equipment Performance Requirements".
For more information on ONS CLASS/CLIP line card specifications, see ONS Line Card.
OPS Line Card
The OPS line card connects to any Peripheral Interface card slot. The OPS line card is a digital
card intended to be used to interface up to eight outside telephone extensions with the system.
The card is meant to interface telephone extensions whose line loop resistance exceeds 400
ohms. As such, the OPS line card is used to connect external telephone systems whose loop
resistance is anywhere from 400 to 1600 ohms (external resistance from 600 to 1800 ohms).
Note: Sending CLASS/CLIP information to an ONS line card will not harm the card.