3-20
Chapter 3
Installing Printed Circuit Cards
8SLI CARD
There are no options to select on this card. Insert as many 8SLI cards as are needed into universal
slots 1 through 7
(see Figure 3-2)
. Push firmly in the middle of both card ejectors on each card to
ensure that it is fully inserted into the back plane connector.
This card automatically detects DTMF or dial pulse signals from the SLT. Software and hardware
settings are not required. When the 8SLI cards are highly utilized with congested traffic, the ratio of
DTMF receiver will be decreased. Therefore, the MFM boards or daughter board should be added to a
processor card to relieve the bottleneck.
NOTE:
1. If a cabinet is equipped with a single power supply unit (PSU-B), a maximum of 56 station
devices may be connected to that cabinet. However, if the cabinet is equipped with two power supply
units, a maximum of 120 station devices may be connected to that cabinet.
See the configuration
section of the General Description Guide for more details
.
2. Do not connect devices with a total REN greater than 5.0 to this card. (Except for Australia. Australia
use an external ringer.)
3. Ringer Frequency:
External Ringer, 20Hz , 80Vrms , SINUSOIDAL WAVE (For Australia, and Italy)
Internal Ringer, 25Hz, 80V , RECTANGULAR WAVE (For the other countries in Europe)
4. This card does not contain OPX over voltage protection circuitry.
5. SLI port feed voltage is nominally 50VDC.
16SLI CARD
There is an internal or external ring option on this card. Insert as many 16SLI cards as are needed
into universal slots 1 through 9
(see Figure 3-2)
. Push firmly in the middle of both card ejectors on each
card to ensure that it is fully inserted into the back plane connector. This card automatically detects
DTMF or dial pulse signals from the SLT. Software and hardware settings are not required. The
16SLI has no DTMF receivers; it will share the system resources. When the 16SLI cards are highly
utilized with congested traffic, the ratio of DTMF receiver will be decreased. Therefore, the MFM
boards or daughter board should be added to a processor card to relieve the bottleneck.
NOTE:
1. If a cabinet is equipped with a single power supply unit (PSU-B), a maximum of 56 station
devices may be connected to that cabinet. However, if the cabinet is equipped with two power supply
units, a maximum of 120 station devices may be connected to that cabinet.
See the configuration
section of the General Description Guide for more details
.
2. Do not connect devices with a total REN greater than 5.0 to this card. (Except for Australia. Australia
use an external ringer.)
3. Ringer Frequency:
External Ringer, 20Hz , 80Vrms , SINUSOIDAL WAVE (For Australia, and Italy)
Internal Ringer, 25Hz, 80V , RECTANGULAR WAVE (For the other countries in Europe)
4. This card does not contain OPX over voltage protection circuitry.
5. SLI port feed voltage is nominally 25VDC.
