Nortel NT1R20, Description

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NT8D09 Analog Message Waiting Line Card Page 227 of 290
Line cards Description
Configuration
This section outlines the procedures for configuring the switches and jumpers
on the NT8D09 Analog Message Waiting Line Card and configuring the
system software to properly recognize the card. Figure 63 shows where the
switches and jumper blocks are located on this board.
Jumper and switch settings
The NT8D09 Analog Message Waiting Line Card has no user-configurable
jumpers or switches. The card derives its address from its position in the
backplane and reports that information back to the Meridian 1 CPU via the
LAN Link interface.
Software service changes
Individual line interface units on the NT8D09 Analog Message Waiting Line
Card are configured using the Single-line Telephone Administration program
(LD 10). The message waiting feature is enabled by entering data into the
customer data block using LD 15. See the X11 input/output guide
(553-3001-400) for LD 10 and LD 15 service change instructions.
Analog message waiting line cards with a vintage later than NT8D09AK
provide a fixed +2 dB transmission profile change in the gain of the D/A
convertor (Table 60). This transmission profile change is used for control of
end-to-end connection loss. Control of such loss is a major element in
controlling transmission parameters such as received volume, echo, noise,
and crosstalk. The loss plan for the analog message waiting line card
determines port-to-port loss between an analog line card unit (port) and other
Meridian 1 PE or IPE ports. LD 97 is used to configure the Meridian system
for port-to-port loss. See the X11 input/output guide (553-3001-400) for
LD 97 service change instructions.
Table 60
Transmission Profile Changes
Vintage A/D convertor gain D/A convertor gain
Previous to AK –3.5 dB –2.5 dB
AK and later –3.5 dB –0.5 dB