2. ITU Reference Model for ISDN PTT Equipment at Phone Company Switch U Interface Termination Point T Interface Termination Point S Interface Termination Point Standard PSTN Equipment has an R Interface Termination Point U T S R TE2 TA TE1 TE1 NT1 NT2 ISDN Equipment that can connect directly to an ISDN Line Terminal Adapter used to connect TE2 devices to an ISDN line Equipment that cannot connect to an ISDN line Network Termination used to convert U into T interface Network Termination used to convert T into S interface
7. NTE 8 The NTE8 (opposite) is the normal NTE within the customers premises for an ISDN2e connection. The NTE8 has TWO RJ45 sockets - ONLY ONE IS TO BE USED - the other is for testing purposes
19. NTE Status Lights BT Testing ON or Flashing Test Amber OK OFF Test Amber Network Faulty ON BT Red Network OK OFF BT Red Two or more inputs disconnected Flashing Customer Amber One input disconnected ON Customer Amber Inputs OK OFF Customer Amber NTE on Standby Battery Flashing Power Green No power to NTE OFF Power Green NTE on mains power ON Power Green Indication Status Light
20. Primary Rate Interface The PRI is supplied through a standard 2.048Mb/s E1 channel. This comprises of 30 64Kb/s B channels and one 64Kb/s D channel
25. The Connection + Power Source/ Sink 2 8 - Power Source/ Sink 2 7 - Transmit/ Receive 6 - Receive Transmit 5 + Receive/ Transmit 4 + Transmit/ Receive 3 - Power Source/ Sink 3 2 + Power Source/ Sink 3 1 Polarity Signal Pin
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Editor's Notes
Primary Rate NTE 4
YES I KNOW we said 32 channels earlier BUT if you remember we gave channel 16 a specific purpose (DPNSS, QSIG etc) SO for many customers channel 16 does not exist (YEAH I KNOW channel 0 does not add up to much for them but for the sake of customer relations we will admit to one and keep the other up our sleeves for later!!