User Manual

AS4000 Subscriber Terminal
Installation and Commissioning
GSI 002
605-0000-454
Draft Issue 1.3 Date 8/02/00
Page 5 of 14
All tones, tone cadences and announcements generated by the Local Exchange
are passed transparently over the AS4000 System. Line feed voltage, ringing
current and ringing cadence are generated by the ST equipment.
The Customer Premises Equipment is connected to the Line Sockets on the
internal Service Interface Unit.
The specific impedance of the NTU allows tests to be performed by the CRU to
ascertain whether the NTU is present on a line and if there is any CPE attached.
3.5 Power Supply Units
Two types of PSU are available. The Type 5 PSU for B, L, and N series
installations that require battery back-up and the Type 6 PSU for installations that
do not require battery back-up.
The, R, S, series Service Interface Units (SIU) use a Type 6 Power Supply
Unit(PSU)
3.6 AC Power Supply Unit (Type 5)
The PSU input voltage ranges from 100-240Volts (1 Amp) The AC supply is
converted to 13V DC to power the external SIU.
In addition, the PSU contains an internal 12V lead-acid battery which is trickle-
charged and which provides a back-up supply for approximately 2.5 hours talk
time or 5 hours standby for voice / ISDN. The battery has an operational life of
five years.
3.7 Type 6 PSU
The Type 6 is a socket PSU the plugs directly into the AC supply socket. It is
supplied with a range of adapters to ensure compatibility with the socket design in
the country of deployment