Troubleshooting Guide

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Page 68 of 73
Configuring the NEC IPX2400 PBX
The NEC requires a substantial amount of programming and circuit card switch settings to properly install T1 PRI. It is beyond the scope of this
document to provide the entire configuration, therefore the NEC information below is directed to NEC techs
The switch settings and software references in this document assume a familiarity with the NEC 2400. It is highly recommended to
have a NEC ISDN certified technician setup the NEC portion.
Configure in the following sequence:
Install Circuit Card
Configure all software
Circuit Card Configuration (PA-24PRTB)
Switch Position Description Settings
MB Make Busy Down
0 Internal Loop Back Off
1 External Loop Back Off
2 Payload Loop Back Off
LB
3 Dch Control Block MBR Off
SENSE
(Rotary)
Protocol
0 = CCIS (NEC proprietary)
1 = NI2
3 = INS1500
5 = AT&T (#4 & #5 ESS)
7 = Nortel DMS100/DMS250
A = Q.SIG
A
1 ON = Impedance 100 ohms
OFF = Impedance 110 ohms
ON
2 XMT XFMR Ground OFF
3 RCV XFMR Ground OFF
SW0
4 Fixed On ON
1 Digital PAD ROM Count
Off = 2 ROM chips on board
On = 3 ROM chips on board
OFF
2 Fixed On ON
3 ON = 24B
OFF = 23B + D
OFF
SW1
4 D-Channel Packet Service OFF
SW2 1 Equalizer ON
2 Equalizer ON
3 Equalizer ON
4 12/24 Multiframe ON
5 AMI/B8ZS ON
6 4K Data Link Control ON
7 4K Data Link Control OFF
8 Fixed ON ON
SW3 1 RMT Alarm OFF
2 RMT Alarm OFF
3 Fixed Off OFF
4 All “1” Supervision OFF
5 Fixed On ON
6 Fixed On ON
7 Fixed On ON