User Manual

AS4000 Subscriber Terminal
Installation and Commissioning GSI 002
605-0000-436
Issue 1.5 Date: 18th October 1999
Page 3 of 6
interfaces or 1 x 128kbit/s. The host can also be interfaced using an interface
connector if needed. The Converter plugs into the Network Terminating and Test
Point (NTTP) equipped with a RJ45 Socket.
4. ST -I1 Subscriber Terminal
4.01 The CRU is connected to a junction box (PSU Type 1) or a terminal block within
the PSU (PSU Types 2 ). The junction box/terminal block is cabled to an NTU, into
which the Customer Premise Equipment (CPE) such as ISDN compatible
telephones, faxes, terminal adapters etc. can be plugged.
4.02 The NTU provides an ITU-T I420 S termination point. The NTU is provided by the
Network Operator to meet country specific requirements. Details are given in this
document for termination of standard RJ45 to the Junction Box. The S termination
can support up to eight ISDN S-bus compatable devices.
Mains Plug
CRU
~
NTU ISDN
S Interface
Drop
Cable
COMMUNICATIONS
Figure 3. AS4000 ST-I1 Connection (Type 4 Power Unit)
5. Power Supply Units
5.01 The ST Equipment is powered from the mains supply of the subscriber premises via
an AC PSU. DC Power from the PSU is passed to the CRU by means of a drop
cable.
5.02 Four types of PSU are available :
1) AC Power Supply Unit (Type 1)