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 to FS11 VPU/4*4, VPU/8*4, VSSC*4 *7No cards
FS12
*7
TRK1 to TRK3 Use DBS 576 Base cabi-
netNo cards
EC1 to EC8, EC/TRK Digital 
extension
linesDEC
SCC, CPC, AUX1 No cards
AUX2 CBLDBS
**1 : Always mount in CPC slot of Base main cabinet.
*2 : Always mount in CPC slot of Expansion main cabinet.
*3 : Certain limitations apply (see page 4-36)
*4 : Cannot be installed in top main cabinet when used in two- or three-main cabinet configuration.
 Example:.
*5 : By setting the switch and reprogramming, the PRI/23 card can be set for S-point (extension 
lines) or T-point (trunks) (see page 5-22,5-45)
*6 : Use the TSW288 card with the CPC-288. Use the TSW576 card with the CPC-576.
*7 : VSSC card must be installed into FS11. FS12 must be kept free due to the width of the HDD 
and to allow for heat dissipation.
DBS 576 DBS 96 
						

							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 communication channels.
Because each flexible slot can handle a maximum of 8 channels, two or more 
flexible slots are effectively occupied per card if you set 16 or more channels. In this 
case, certain slots must be left vacant.
The following table shows which slots cannot be used according to the number of set 
channels. Do not attempt to install any cards in the unusable slots.
Table 4-2.  PRI/23 and T1 card limitations
Note:
The PRI/23 card can only be set for 8 channels or 24 channels when 
used for S-point (extension) connections.
Figure 4-35. Restriction on PRI/23 and T1 cards installed in flexible slots of DBS 576
Channels Card installation 
positionUnusable slots
FS1 installed FS5 installed FS9 installed
8ch FS1 to FS12 No limit
16ch FS1, FS5 or FS9 FS2 FS6 FS10
24ch FS2 to FS3 FS6 to FS7 FS10 to FS11 
						

							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 
Conference Cards222244 
						

							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
• TBRI/4 card
• PRI/23 card
• T1 card
When the maintenance switch is on, the cards are in the following state:
• Incoming calls are ignored;
• Outgoing calls are prevented;
• The line is disconnected on completion of any current call.
That is, further incoming calls are ignored and outgoing calls are prevented as 
soon as any current call is completed.
The cards can be removed as soon as all circuits on the card are idle and the busy 
lamps are off. CAUTION:
• Check that the line busy lamp is off before removing the card. If the 
lamp is on, the line will be disconnected when the card is removed.
• Check that the maintenance switch is off. After replacing the card in its 
slot on completion of the maintenance work.
• Never attempt to remove any of the following cards while the system is 
operating:
• CPC96 card • CPC288 card
• CPC576 card
• TSW288 card
• TSW576 card
• CBLDBS card
• CBL card
• SCC card
• ACD card
• VPU/8 card
• VPU/4 card
• VSSC 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 warn users that the lines will be disconnected. 
						

							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: T1 trunk interface card (1 port)
In addition to the trunk cards, if installing using any combination of LTRK/8, 
LGTRK/8 or DIDTR/8 cards, an appropriate number of Trunk MDF Cards must be 
installed for each cabinet as described in “Trunk MDF Interface Card” on page 5-4.
Install the correct type of cards in the cabinet for the trunks that are to be connected, 
then connect the trunks.
The following describes how to connect the respective types of trunks. 
						

							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 connector provides connection to two (2) trunk circuits.
• The Trunk MDF Interface may be mounted on either side of the cabinet. If the 
system may expand to include cabinets installed side by side, install the MDF 
Interface on the side of the cabinet that will remain on the outside.
• The Trunk MDF Interface contains three (3) sets of four (4) modular connectors. 
Each set of four modular connectors supports one LTRK/8, LGTRK/8, or DIDTR/
8 trunk card.
• A second type of MDF Interface is used with the DBS 576. The Extension MDF 
Interface is also installed in the MDF Interface positions on the side of the 
cabinet. Make certain that you use the correct MDF Interface.
Installation
1.  From Table 5-1 determine the total number of Trunk Interface Cards required 
per cabinet. 
Table 5-1.  Number of Trunk Interface Cards Required per Cabinet
2.  From Figure 5-2, determine the Trunk MDF Interface Card position(s).Total Number of Trunk
Cards in Cabinet
(LTRK/8, LGTRK/8, and DIDTR/8)Required Number of Trunk 
MDF Interface Cards
1 to 3 1
4 to 6 2
7 to 9 3
10 to 12 4
MDF-CO card 
						

							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 DIDTR/8 
cards (up to 24 trunks). See “Trunk MDF Interface Card” on page 5-4 for 
information on installing the Trunk MDF Interface Card.
• Each trunk card requires a modular cable assembly (supplied with trunk card). 
• Cabling must also be completed from the MDF interface card to the MDF (cables 
not supplied).
• The maintenance switch (SW1) on the LTRK/8 card can be set so that the card 
can be removed and installed while the system is operating. See page 5-1 for 
details on the maintenance switch.
• A Caller ID Card (VB-44513) may be installed on the LTRK/8 to provide caller 
ID numbers. 
• Table 5-2 shows the maximum numbers of cards and trunks per system type.
Table 5-2.  Maximum loop-start trunks per system
Installation
Note:Prior to installing the Loop Start Trunk Card, make certain you can connect 
to a Trunk MDF Interface Card (VB44512) mounted on the side of the cabinet. See 
“Trunk MDF Interface Card” on page 5-4 for more information on installing a Trunk 
MDF Interface Card.
1.  If installing a Caller ID (CID, VB-44513) piggyback card, install the card as 
shown in Figure 5-3. System Type Maximum Number of Cards Maximum Number of Loop 
Start Trunks
96 ports (CAB96
51) 12 1-96
192  ports (CAB96 + CAB96B) 24 1-192
288  ports (CAB96 + CAB96B
52) 36 1-288
384  ports (CAB96
52 + CAB96B52) 48 1-384
480  ports (CAB96
52 + CAB96B53) 60 1-480
576  ports (CAB96
52 + CAB96B54) 72 1-576
LTRK/8 card