Panasonic Digital Business System 576 Technical Manual Section 300

Section 300-Installation Chapter 4. - Installing Additional Cabinets
576-13-300 DBS 576 (USA), issued 6/2/98  4-35
Figure 4-34. Card installation positions in system comprising DBS 576 and DBS 96
Slot Card
Base Expand-1 Expand-2 to 6
CPC CPC288, CPC-576
*1CBL*2CBL*2
OP1 TSW288*6, TSW576*6No cards
OP2 SCC
FS1 to FS12 Trunks Digital T1
*3, TBRI/4, PRI/23*3*5
Analog LTRK/8, LGTRK/8, DIDTR/8, E&M/4
Extension
linesDigital DEC/8, SBRI/4, PRI/23
*3*5
Analog AEC/8
Options/Audio 
applicationsMFR/8, CONF
*3
FS10...

Chapter 4. - Installing Additional Cabinets Section 300-Installation
4-36 DBS 576 (USA), issued 6/2/98 576-13-300
Restriction on Number of Cards
Note that only a limited number of PRI/23, T1, and CONF cards can be installed in 
the flexible slots (FS). Do not attempt to install more than the prescribed maximums.
PRI/23/T1 Card
The switches on the PRI/23 card (see page 2-31), the T1 card (see page 2-33) and the 
settings described in the Programming Manual (Section 400) allow you to select 8, 
16 or 24...

Section 300-Installation Chapter 4. - Installing Additional Cabinets
576-13-300 DBS 576 (USA), issued 6/2/98  4-37
Conference Card
There is a limit to the number of eight-party conference card (CONF) that can be 
installed in a system cabinet as follows: 
Optimization of Card Installation
As far as possible, group the cards installed in the flexible slots as shown below.
Ensure that any vacant slots are evenly distributed.
Figure 4-36. Optimization of card installation
Cabinet # 123456
Number of...

Chapter 4. - Installing Additional Cabinets Section 300-Installation
4-38 DBS 576 (USA), issued 6/2/98 576-13-300 

576-13-300 DBS 576 (USA), issued 6/2/98  5-1
Chapter 5. Trunks and Extensions
This chapter explains how to connect trunks and dedicated lines, how to connect 
different types of digital and analog extensions, and how to mount telephones on the 
wall.
Maintenance Switches
uidelines
• The following cards can be removed from and replaced in their slots even when 
the system is operating (power is on) provided the maintenance switch is set to 
ON (up).
• LTRK/8 card
• LGTRK/8 card
• E&M/4 card
• DIDTR8 card...

Chapter 5 - Trunks and Extensions Section 300-Installation
5-2 DBS 576 (USA), issued 6/2/98 576-13-300
Figure 5-1. Maintenance switch positions (LTRK/8 card shown)
• Cards for the following extension lines can be removed and replaced while the 
system is operating.
• DEC/8 card
• AEC/8 card
• SBRI/4 card
• MFR/8 card
• CONF card
Note:Because there are no busy lamps for calls on extension lines, you cannot 
check the status of these lines. We recommend using paging, etc., before removing 
the cards, to...

Section 300-Installation Chapter 5 - Trunks and Extensions
576-13-300 DBS 576 (USA), issued 6/2/98  5-3
Trunks
The following cards are used with trunks:
• LTRK/8: Loop start trunk interface card (8 ports)
• LGTRK/8: Loop Start/Ground Start trunk interface card (8 ports)
• DIDTR/8: Direct Inward Dial trunk interface card (8 ports)
• E&M Tie Line trunk interface card (4 ports)
• TBRI/4: T-point ISDN basic interface card (4 ports)
• PRI/23: T-point and S-point ISDN primary rate interface card (1 port)
• T1:...

Chapter 5 - Trunks and Extensions Section 300-Installation
5-4 DBS 576 (USA), issued 6/2/98 576-13-300
Trunk MDF Interface Card
Guidelines
• Loop-Start trunks (LTRK/8), Loop-start/Ground-start trunks (LGTRK/8), and 
DID trunks (DIDTR/8) trunks connect to the Main Distribution Frame through 
the Trunk MDF Interface (MDF-CO) card. Each Trunk MDF Interface supports 
any combination of up to three of these trunk cards.
• Each trunk circuit card contains four (4) four-wire modular connectors. Each 
four-wire...

Section 300-Installation Chapter 5 - Trunks and Extensions
576-13-300 DBS 576 (USA), issued 6/2/98  5-5
Figure 5-2. Trunk MDF Interface Installation
3.  Holding the Trunk MDF Interface Card in place, insert the bottom tab of the 
Trunk MDF Interface Card into the slot opening at the bottom of the MDF 
Interface Card position.
4.  Use the supplied screw to fasten the Trunk MDF Interface Card into place.
5.  Repeat steps 3 and 4 for any additional Trunk MDF Interface Cards to be 
installed. 

Chapter 5 - Trunks and Extensions Section 300-Installation
5-6 DBS 576 (USA), issued 6/2/98 576-13-300
Loop-Start Trunks
Guidelines
• Loop-start trunks are connected to a LTRK/8 card (VB-44510) installed in a 
flexible slot of the cabinet. A maximum of 8 trunks can be connected to each 
LTRK/8 card.
• One or more Trunk MDF Cards (VB-44512) must be installed to support 
connection of trunks from the Main Distribution Frame (MDF) to the LTRK/8 
card. Each Trunk MDF supports up to three LTRK/8, LGTRK/8 or...