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NT1R20 Off-Premise Station Analog Line card Page 161 of 894
Circuit Card Description and Installation
— firmware version
— self-test status
— programmed configuration status
• receipt and implementation of card configuration:
— programming of the codecs
— enabling/disabling of individual units or entire card
— programming of input/output interface control circuits for
administration of line interface unit operation
— maintenance diagnostics
— transmission loss levels
Card LAN interface
Maintenance data is exchanged with the CPU over a dedicated asynchronous
serial network called the Card LAN link. The Card LAN link is described in
the section “Intelligent Peripheral Equipment” on page 30.
The NT1R20 OPS analog line card has the capability of providing an
interrupted dial tone to indicate that a message is waiting or that call
forwarding is enabled. The line card (optionally) receives messages stating
that these conditions exist over the Card LAN Interface and interrupts the dial
tone when either of these conditions are detected.
Software service changes
Individual line interface units on the NT1R20 OPS analog line card are
configured to either OPS (for OPS application) or On-premises Station
(ONS) (for ONS application) Class of Service (CLS) in the Analog (500/
2500-type) Telephone Administration program LD 10. See Table 62.
LD 10 is also used to select unit terminating impedance and balance network
impedance at the TIMP and BIMP prompts, respectively.
The message waiting interrupted dial tone and call forward reminder tone
features are enabled by entering data into the customer data block using
LD 15.