12
MX250 Hardware Manual
3.3
Rear Side of MX250
The rear side of the MX250, as shown in figure 3-2, contains the power and communication
interface connectors.
The numbers in figure 3-2 correspond to the following components:
1.
Fuse
– Provides access to a 6 A, 5 x 20 mm, time lag fuse, which is in series with the –48V
battery. Replace this fuse only with a fuse of the same rating.
2.
DC power input
– When this input is connected to an external –48 Vdc battery supply, the
system remains powered when the ac supply is off. See section 4.3 on page 23.
Zultys recommends using the BPS12 as the external supply. Read the
BPS12 Hardware
Manual
for details on its installation and operation.
3.
Reset button
– When power to the MX250 is off, pressing this button will turn on the unit.
When power is on, pressing this button for one second initiates a system shut down.
4.
IP address
– An area to enter the configured IP address assigned to the MX250 with a label or
permanent marker.
5.
Analog FXS
– Two RJ11 connectors provide two analog FXS ports for connecting fax
machines, analog phones, or modems to the MX250. During a power failure on the MX250,
these circuits connect directly to the first two circuits on the FXO card of the first slot. See
6.
3.5 mm audio jacks
– The port marked
IN
provides a 3.5 mm unbalanced input for music on
hold. The source can be stereo or mono with an output impedance of less than 120
Ω
and a
level of 5 Vrms (as recommended by IEC 61938). The port marked
OUT
provides a 3.5 mm
output for connecting to an external speaker system such as an analog paging unit.
7.
First Ethernet port
– A 10/100Base-T circuit for connecting to any IP device, such as a LAN
switch, router, or IP phone. No in-line power is provided on this circuit. See section 3.4.1 on
8.
Second Ethernet port –
A 10/100Base-T circuit for connecting to any IP device, such as a LAN
switch, router, or IP phone. No in-line power is provided on this circuit. See section 3.4.1 on
page 13. This circuit also serves as the console port as defined in section 3.5 on page 18.
Figure 3-2
Rear Side of MX250
Summary of Contents for MX250
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