Antonio Perez

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======INSTALLING MORE THAN ONE DIGITAL LINE CARD======




**Symptoms:**
  * Installation of more than one T1 (PRI) boards  
  * Installing more than one Digital Line Card  
  * When installing 2 DLCs they do not come up online  
  * Device will not auto-discover  
 



**Changes:**
  * New installation of PRI or T1   





**Facts:** SuperStack 3 NBX  
  * NBX 100  
  * NBX Digital Line Card  
  * T1 (DS1)  
  * Primary Rate Interface (PRI)  
  * NBX 100 R2_6  
  * NBX 100 R2_8  
  * NBX 100 R3_0  
 




**Fixes:** When installing 2 PRI circuit boards: Before installing the first board: 

**1.** From NetSet in System Settings > System-Wide enable Auto-Discover Digital Line Cards and click Apply 

**2.** Slide one DLC into the NBX chassis, but do not plug it in yet 

**3.** Set up a HyperTerminal session to capture the information. Connect the cable to the console connector on the DLC (not on the NCP) 

**4.** Make sure that the T1 circuit is not connected to the DLC 

**5.** Make sure the LAN is not connected to either the DLC or the NCP. However, on the SS 3 NBX there must be Ethernet connectivity between the NCP and the chassis with the DLC. Use a 10Base T cross-over cable if necessary. 

**6.** Plug in the first DLC 

**7.** Load the first board completely. (Via Hyperterminal make sure that the NCP discovered the board and it loaded the software completely by watching the second reboot. It should show the DSPs loading as well as the channel maintenance sequence at the end of the boot. The board should boot twice - the first time to boot from the drive, and the second to load and run the code. You will see this if you follow the hyperterminal session. Note: In some cases this may take up to 15 minutes! 


**8.** Reconnect the system to the LAN and disable auto-discovery. Program the board via NetSet (Digital Line Card - Board, Span, and Groups - do not forget to check Copy Settings, and Refresh.) Please note that for a PRI there are no other parameters to change. The channels follow the protocol set up (Q931) and do not require modification.



//Note: In high voice traffic scenarios on the T1s you may have to connect the uplink ports on the DLCs to the data switch. The switch port must be configured for 10MB, half-duplex only--no auto-negotiation, no flow control! If T1 traffic is light to moderate (Voice Traffic), then there is no need to connect the uplink ports.//

BE AWARE THAT WITH THE UPLINK PORTS CONNECTED, YOU MAY EXPERIENCE DROPPED CALLS . If this occurs, then disconnect the uplink ports and retest. 

Supported Network Settings : PRI : DMSCustom ATTCustom National ISDN NI1/NI2 B8ZS ESF T1 : D4/AMI ESF/B8ZS WINK START ONLY E&M SIGNALING # of digits for DID numbers being received from the Telco - if dead air is received on inbound calls, then you have a digit mismatch! Contact your Telco and verify. 

Also, in Span > Status, look at the inbound call to verify. For the second Board, repeat the steps outlined above. Make sure that when you plug in the board - again, no connections to the NCP or the network at all! Remember to enable auto-discovery when installing the second t1 board. Remember to disable auto-discover when you have successfully added the new board to the system. Program the board as outlined above . 

After both boards are up and running, connect the T1 spans and the LAN. If there is not heavy traffic on the pri circuits, do not use the uplink ports. If you do use these, then remember that they must be configured as 10Base T half-duplex connections in the switch. The Uplink ports do not support auto-negotiation. If these Uplink ports are connected, the voice and control traffic from the DLC will route thru the switch, not the chassis backplane. Only the control traffic will then route to the NCP via its uplink connection. 

The result is that the traffic on the network following a path to the NCP will have a net decrease because (most of) the voice will be off-loaded directly to the LAN. Note: If you are installing more than one PRI using a hunting sequence from the Telco: MAKE SURE THAT YOU USE 2 EACH "D" CHANNELS FOR SIGNALING, channel 24 on each circuit, as the NBX does not support one channel for this application (NFAS, or Non-Facility Associated Signalling). Also, test the hunt groups with your CLEC after the boards are on line and set up correctly! Make sure that your telco has programmed the groups in at the time of turn up of the circuit.  
 



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  * Product(s):  NBX  
  * Sub Product(s): NBX 100, NBX Digital Line Card, NBX Operating System, SuperStack 3 NBX  




 --- //[[nce@itclatam.com|David Gonzalez]] 2021/04/12 09:05//