14
NTU-1
4. Connector Pinouts
The NTU-1 connects to the central office (CO) and customer premise equipment
(CPE) with standard 8-pin RJ-45 modular connectors. All connections are on the
rear panel and are labeled.
4.1 NTU-1 to ISDN U Interface
The U jack connects the NTU-1 to the ISDN. Pin functions are shown in Table 4-1.
Table 4-1. Pin functions for U jack
Pin
Function
1
Not used
2
Not used
3
Not used
4
Transmit to/Receive from ISDN network
5
Transmit to/Receive from ISDN network
6
Not used
7
Remote power source (-)
8
Remote power source (+)
4.2 NTU-1 to Terminal Endpoint Equipment
The S/T jacks connect the NTU-1 to the terminal equipment. Either jack can be
an S interface or a T interface. Pin functions are shown in Table 4-2.
Table 4-2. Pin functions for S/T jacks
Pin
Function
1
Not used
2
Not used
3
R from terminal equipment
4
Tr to terminal equipment
5
Transmit - to terminal equipment
6
Receive - from terminal equipment
7
Terminal equipment power (-)
8
Terminal equipment power (+)