Panasonic Digital Business System 576 Technical Manual Section 300

							Section 300-Installation Chapter 2. System Overview
576-13-300 DBS 576 (USA), issued 6/2/98  2-29
Table 2-16.  Maintenance switch (SW4) settings of TBRI/4 card
Table 2-17.  Circuit select switch (SW1) settings of TBRI/4 card
Table 2-18.  LED indication of TBRI/4 cardSetting Description
ON Card is in closed status, and can be mounted and removed when the power is ON. 
(Sending/receiving of calls is disabled. If this is set during speech, sending/receiving 
of calls is disabled after speech ends.)
OFF Normal operation (This switch is set to OFF for normal operation.)
Switch Position Description
0 OFF (default setting when unit is shipped)
1 1st interface condition displayed by LAYER1 LED and LAYER2 LED
2 2nd interface condition displayed by LAYER1 LED and LAYER2 LED
3 3rd interface condition displayed by LAYER1 LED and LAYER2 LED
4 4th interface condition displayed by LAYER1 LED and LAYER2 LED
5 to 7 Not used
LED indication Description
LED1
(LINE BUSY)Turns ON when trunk is in use.
LED2
(SYNC)Turns ON when network synchronization clock is sent.
LED3
(LAYER1)Turns ON when synchronization is established.
LED4
(LAYER2)Turns ON when data link (DL) is established. 
						

							Chapter 2. System Overview Section 300-Installation
2-30 DBS 576 (USA), issued 6/2/98 576-13-300
PRI/23 card (VB-44540): PRI Card
The PRI/23 card is a T-point ISDN primary group interface (23B + D/24B: 1544 
kbps) and also an S-point ISDN primary group interface accommodation card.
The PRI/23 card is mounted on a flexible slot to connect the system to ISDN (to 
access ISDN services). It is possible to use either the T- or S-point ISDN primary 
group interface by setting a switch on the card or by a program setting. By selecting 
the mode switch on the card, 8/16/24 channel modes can be selected, however, there 
are restrictions to the position of the slot to which the card is mounted. This depends 
on the number of accommodating channels. For details on the restrictions of the slot 
position, see page 2-39.
A maximum of three cards can be mounted in each cabinet. When there are six 
cabinets, a maximum of 18 cards can be mounted.
The PRI/23 card has an on-board lightening arrester, so that the card can be 
connected to the carrier trunk corresponding to the T-point primary group interface 
through a CSU. (The CSU is not provided.)
This clock provides a network clock synchronizing function. 
						

							Section 300-Installation Chapter 2. System Overview
576-13-300 DBS 576 (USA), issued 6/2/98  2-31
Figure 2-22. PRI/23 card
Tables 2-14 to 2-17 show the switch settings and LED indications.
Table 2-19.  Maintenance switch (SW4) settings of PRI/23 card
Table 2-20.  Dip switch (SW1) settings of PRI/23 cardSetting Description
ON Card is in closed status, and can be mounted and removed when power is ON. (Send-
ing/receiving of calls is disabled. If this is set during speech, sending/receiving of 
calls is disabled after speech ends.)
OFF Normal operation (This switch is set to OFF for normal operation.)
Switch No. Distance from the DBS 576 to the CSU
0 to 150 ft. 150-450 ft. 450-655 ft.
SW1-1 ON OFF OFF
SW1-2 OFF ON OFF
SW1-3 OFF OFF ON
SW1-4 OFF ON OFF
SW1-5 OFF OFF ON
SW1-6 OFF ON OFF
SW1-7 OFF OFF ON
SW1-8 Not used 
						

							Chapter 2. System Overview Section 300-Installation
2-32 DBS 576 (USA), issued 6/2/98 576-13-300
Table 2-21.  Dip switch (SW2) settings of PRI/23 card
Table 2-22.  LED indications of PRI/23 cardSwitch No. Description
SW2-1 ON Sets to trunk for T-point.
OFF Sets to extension line for S-point.
SW2-2 ON Sets to other mode where 1 to 16B+D or 1 to 23B+D channels set by pro-
gram can be used.
OFF Sets to 8ch mode where 1 to 8B+D channels can be used.
LED indication Description
LED1
(LINE BUSY)Turns ON red when B channel is in use.
LED8
(SYNC)Turns ON red when set to adstracting Network synchronizing clock.
LED3
(SLIP)Turns ON red when SLIP abnormality is detected.
LED6
(YEL/RA1)Turns ON red when receiving YELLOW alarm signal.
LED4
(AIS)Turns ON red when receiving AIS signal.
LED7
(CFA)Turns ON red during RED alarm.
LED5
(OOF)Turns ON red when frame failure is detected.
LED2
(LOOP)Turns ON red when data receiving failure is detected. 
						

							Section 300-Installation Chapter 2. System Overview
576-13-300 DBS 576 (USA), issued 6/2/98  2-33
T1 Interface card (VB-44550)
The T1 Interface card is mounted in a flexible slot to connect the system to T1 
services. By selecting the mode switch on the card, 8/16/24 channel modes can be 
selected, however, there are restrictions to the position of the slot to which the card is 
mounted. This depends on the number of accommodating channels. For details on 
the restrictions of the slot position, see page 2-39.
A maximum of three cards can be mounted per cabinet. When there are six cabinets, 
a maximum of 18 cards can be mounted.
The T1 card has an on-board lightening arrester, so that the card can be connected to 
the carrier trunk through a CSU (not provided).
This card requires the system sync circuit card be installed for clock synchronization.
Figure 2-23. T1 card
Table 2-23, Table 2-24, and Table 2-25 show the switch settings and Table 2-26 
shows the LED indications. 
						

							Chapter 2. System Overview Section 300-Installation
2-34 DBS 576 (USA), issued 6/2/98 576-13-300
Table 2-23.  Maintenance switch (SW3) settings of T1 card
Table 2-24.  Dip switch (SW1) settings of T1 card
Table 2-25.  Dip switch (SW2) settings of T1 card
Table 2-26.  LED indications of T1 cardSetting Description
ON Card is in closed status, and can be mounted and removed when power is ON. (Send-
ing/receiving of calls is disabled. If this is set during speech, sending/receiving of 
calls is disabled after speech ends.)
OFF Normal operation (This switch is set to OFF for normal operation.)
Switch No. Distance from the DBS 576 to the CSU
0 to 150 ft. 150-450 ft. 450-655 ft.
SW1-1 ON OFF OFF
SW1-2 OFF ON OFF
SW1-3 OFF OFF ON
SW1-4 OFF ON OFF
SW1-5 OFF OFF ON
SW1-6 OFF ON OFF
SW1-7 OFF OFF ON
SW1-8 Not used
Switch No. Description
SW2-1 ON Not used
OFF Not used
SW2-2 ON Sets to other mode where 1 to 16 or 1 to 24 channels set by program can be 
used.
OFF Sets to 8ch mode where 1 to 8 channels can be used.
LED indication Description
LED1
(LINE BUSY)Turns ON red when B channel is in use.
LED8
(SYNC)Turns ON red when set to adstracting Network synchronizing clock.
LED3
(SLIP)Turns ON red when SLIP abnormality is detected.
LED6
(YEL/RA1)Turns ON red when receiving YELLOW alarm signal.
LED4
(AIS)Turns ON red when receiving AIS signal.
LED7
(CFA)Turns ON red during RED alarm.
LED5
(OOF)Turns ON red when frame failure is detected.
LED2
(LOOP)Turns ON red when data receiving failure is detected. 
						

							Section 300-Installation Chapter 2. System Overview
576-13-300 DBS 576 (USA), issued 6/2/98  2-35
DEC/8 card (VB-44610): Digital Extension Card
The DEC/8 card is an interface accommodating card for digital key telephones 
(1B+D: 64 kbps + 16 kbps).
The DEC/8 card is mounted in a flexible slot to connect digital extension line 
terminals (1B+D: digital multi-function telephones and DSS). This card 
accommodates an on-board 8-circuit extension port interface. The connection format 
is 2-wire non-polarized home run (star) wiring.
The major specifications on wiring are as follows:
• Supply voltage and current to telephone terminal: maximum +24V/200mA
• Allowable wiring distance: maximum 40 ohms with loop to terminal
• Maximum 20 Ohms with loop to DSS/72, EM/24, and Voice Recognition 
Telephone.
Figure 2-24. DEC/8 card 
						

							Chapter 2. System Overview Section 300-Installation
2-36 DBS 576 (USA), issued 6/2/98 576-13-300
AEC/8 card (VB-44620): Analog Extension Card
The AEC/8 card is an extension line interface accommodating unit for standard 
telephones (SLT). The AEC/8 card is mounted on a flexible slot to connect a 
standard telephone (SLT) to the system.
The AEC/8 card has an 8-circuit analog extension line interface, and provides such 
functions as call signals from a standard SLT, detection of dialing (10 pps/DTMF) 
and speech.
The supply voltage to a standard SLT is +24V, and a ringer circuit is built-in.
The duration of one callup signal from the built-in ringer circuit is a maximum one 
second. Control is in three phases when eight trunks are simultaneously called up: 
the first phase for the first to third circuits, the second phase for the fourth to sixth 
circuit, and the third phase for the seventh and eighth circuits.
The major specifications on wiring are as follows:
• Supply voltage/current for speech path: +24 V/25mA or more
• Loop resistance: 100 Ohms or less
• Ringer signal frequency: 20Hz rectangular wave
• REN: 2
• CPC (Positive AEC Disconnect) control possible
• Ring trip detection possible
Figure 3-25. AEC/8 card 
						

							Section 300-Installation Chapter 2. System Overview
576-13-300 DBS 576 (USA), issued 6/2/98  2-37
SBRI/4 card (VB-44630): BRI Card (S-point)
The SBRI/4 card is a basic interface (2B+D: 192Kbps) accommodating card for S-
point IDSN.
The SBRI/4 card is mounted on a flexible slot to accommodate terminal extension 
lines of the basic user network interface of an ISDN terminal.
The system supplies +40V to the ISDN terminal which is mounted for extension 
lines.
The SBRI/4 card has an on-board 4-circuit S-point ISDN basic interface, and a 
lightening arrester.
Figure 3-26. SBRI/4 card 
						

							Chapter 2. System Overview Section 300-Installation
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Table 2-27 and Table 2-28 show the switch settings and LED indications.
Table 2-27.  Settings of circuit selection switch of SBRI/4 card
Table 2-28.  LED indications of SBRI/4 cardSwitch Position LED Indication
0 OFF (default setting when unit is shipped)
1 1st interface condition displayed by LAYER1 LED and LAYER2 LED
2 2nd interface condition displayed by LAYER1 LED and LAYER2 LED
3 3rd interface condition displayed by LAYER1 LED and LAYER2 LED
4 4th interface condition displayed by LAYER1 LED and LAYER2 LED
5 to 0 Not available
LED indication Description
LED3
(LAYER1)Turns ON when synchronization is established
LED4
(LAYER2)Turns ON when DL is established