Teleste Ac1000 User manual

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 1(11)

printed on December 17, 2002

A: AC1000 AMPLIFIER PLATFORM

General

The AC1000 is a single active output amplifier with

high gain. The amplifier can be used for distribution

purpose at high gain mode and also as a line

amplifier with lower gain. It is extremely versatile

and scalable through a wide range of plug-in

options. The amplifier platform can also be easily

upgraded to operate as a fibre node. The part A of

this document is devoted to procedures possible

while the Access platform is used as an amplifier.

Similar information concerning the fibre node will be

found in part B of this document respectively.

Installation

TheAC1000canbeinstalledeitherintoastreet

cabinet or to an outdoor environment. The node

should be installed in a vertical position so that the

external cable connectors are underneath. Secure

the housing with three mounting brackets – see

fig.1 for the positions of mounting brackets as well

as other installation dimensions.

The cover opens with the hinges to the left. The

open cover can be removed by first opening the

cover into a 90 degrees angle and the lifting it off

the hinges. Close the lid by tightening the four

retaining bolts in a diagonal sequence. Before

closing the lid check that

-nothing is trapped between the lid and the case

- all case gaskets are in their correct positions

A sufficient tightening torque is 3 Nm. Ensure that

the lid seats evenly on the rubber gasket. The class

of enclosure is IP54.

To ground the amplifier housing connect at least

4mm

2grounding wire (Cu) from a proper earth to

the grounding point (see the arrow in fig.1).

Cable connections

Underneath the AC1000 amplifier there are four

cable connection points: input, input bypass/output

and two outputs. The amount and function of the

actual connectors varies with the chosen

configuration. All coaxial outputs have a standard

PG11 thread and they accept any KDC type

adapter or connector. A suitable length of the cable

inner conductor exposed for the connectors is

approximately 20 mm (fig.2).

8602013

Fig.1. Dimensions of the AC1000

housing and the grounding point

location

Type Description

AC6110 0 dB input module

AC6112 1/12 dB tap

AC6120 0 dB output module

AC6124 two-way splitter

AC6128 2/9 dB tap

AC6111 termination module

Table 1. List of available input and

output connector modules

ac1000_rf

Fig.2. RF cable connector

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 2(11)

printed on December 17, 2002

Power feed

The supply voltage of the remote powered amplifier (27...65 V AC or ± 33...90 V

DC) can be fed through any of the cable connections by inserting a fuse to the

corresponding fuseholder (fig.3 pos.22). When a cable connection is used for

powering, the maximum supply current is 8.0 A.

The power intake of the remote powered amplifier may also be done externally

via the cable feed-through that is located on the upper left corner of the

amplifier. In this case the maximum supply current is 12.0 A.

External power can also be fed through the amplifier into the network. Maximum

feed-through current is 8.0 A per port.

Connectors and plug-in unit slots

Fig.3. AC1000 plug-in placement,

1) Input

2) Input by-pass / Output 3 (*)

3) Output 2

4) Output 1

5) Input test point, -20 dB transformer

6) Test signal injection point, -30 dB

transformer

7) Output test point, -20 dB directional

coupler

8) Input module (see table 1)

9) Input diplex filter

10) Input attenuator

11) Input equaliser

12) Slot for element management

transponder module

13) Interstage attenuator

14) Interstage equaliser

15) Output diplex filter

16) Return path input attenuator

17) Return path equaliser

18) Return path attenuator

19) Output module 1 (see table 1)

20) Output module 2 (see table 1)

21) Input by-pass / Output 3 jumper (*)

22) Fuse(s)

*) See chapter Jumper settings (next page)

1234

11 14

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 3(11)

printed on December 17, 2002

Adjustments

Forward path

The AC1000 is available in many configurations to fill various network

requirements. The amplifier is delivered according to the specifications defined

in the ordering code. Optional return path operation needs plug-in diplex filters.

The available diplex filter types are CXF030 (30/47 MHz), CXF042 (42/54 MHz),

CXF050 (50/70 MHz) and CXF065 (65/85 MHz). It is also possible to order the

amplifier with no diplexers, in which case the diplex filters are replaced by

forward path jumpers CXF000. In addition an optional element management

transponder module is available allowing remote monitoring and controlling of

the amplifier.

The input and output amplifier stages are both based on high performance

solutions which allows the operator to set this amplifier’s outputs for trunk or

distribution levels. Input and output modules are passive plug-ins used to

control the outputs – see table 1. During the adjustment the plug-in unit

positions for input and output modules must be equipped at least with the 0 dB

modules.

Install the interstage equaliser and attenuator plug-ins (fig.3 pos.14 and 13)

according the network plan. The network plan should specify exact signal

values.

Set the output slope of the amplifier according to the network plan calculation by

means of input equaliser (fig.3 pos.11). The signal can be measured at the

-20 dB output test point (fig.3 pos.7). To reach finally the desired output level

select an appropriate input attenuator for the plug-in position 10 (fig.3). Note! If

the income level of the amplifier is quite high or unknown, replace the input

attenuator in position 10 (fig.3) with an attenuator of rather big attenuation value

e.g. JDA915 (15 dB, 860 MHz).

Return path

The return path adjustment is based on unity gain principle such that the return

path gain of the amplifier station exactly matches the loss of the cable following

it (i.e., the cable span toward the headend). Inject a signal of known power into

the test signal injection point (fig.3 pos.6) in the amplifier and measure the

output level in the headend. Once the signal is received at the headend, it can

be measured and the information sent into the forward path as a narrowband

signal. This signal can be detected from the -20 dB test point (fig.3 pos. 7).

Adjust the gain (fig.3 pos. 18) and slope (fig.3 pos.17) of the amplifier until the

target level is produced.

The return path requires a specific signal level for proper operation. The ideal

level at the amplifier is based on the incoming power and the maximum loss

through which that signal must travel on its way to the amplifier. A typical

individual channel level at the return path input is in range of 70…80 dBµV.

Usually the return path input attenuator (fig.3 pos.16) is set to 0 dB. If the

amplifier is used as the last amplifier in a network and it is followed with a

distribution network with an exceptional low attenuation, an extra attenuation

can be added. Attenuators of the JDA series type ranging from 0 dB to 20 dB in

1 dB steps are available.

If the return path is not in use, the return path attenuator (fig.3 pos.18) should

be removed. The termination towards the headend will then be completed

automatically. Alternatively the return path can be terminated towards

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 4(11)

printed on December 17, 2002

fuse

by-pass / output 3

client/network by replacing the return path input path attenuator (fig.3 pos.16)

with an attenuator of big attenuation value e.g. JDA920 (20dB, 860 MHz) or with

a 75 ohm termination plug-in JDA975.

Utilising remotely controlled ingress switch allows the operator to isolate

problems in return path and take corrective actions. The return path signal can

either be cut off (i.e. signal is attenuated more than 50 dB) or be attenuated by

6 dB. As default factory setting the ingress switch is set to 0 dB position. Since

homes may not always be connected to return path services, the return path RF

signal should be cut off by the management unit. Once connected, the ingress

switch should be set to 0 dB position.

Jumper settings

The function of the Input by-pass / Output 3 port (fig.3 pos.2) is selected with a

jumper (fig.3 pos.21). The jumper positions are displayed in the protective

covering inside the amplifier housing (see fig.4). When the jumper is in the by-

pass position, the input signal is passed straight through the amplifier into the

port in question. In case the jumper is in the output 3 position, the output signal

is fed into this port. Note! The output module 2 slot (fig.3 pos.20) has to be

fitted with a proper module (splitter or tap) to enable the third output port.

Fig.4. By-pass / Output 3 jumper location and settings

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 5(11)

printed on December 17, 2002

B: AC1000 FIBRE NODE

General

The AC1000 is extremely versatile and scalable through a wide range of plug-in

options. The trend toward fibre deep architecture is also fully supported in the

Access amplifier platform. If smaller segments are needed due to increased

capacity demand the amplifier platform can be easily upgraded to operate as a

fibre node.

Information concerning installation, cable connections, powering and plug-in

placement can be found in part A of this document.

Fibre connections

The node can accept two fibre cables. These cables carries forward path and

return path optical signals. When feeding the optical cable in the node, a

suitable PG11 threaded feed-through adapter type KDO8xx, is available. NOTE!

Each KDO adapter is manufactured using a high quality precision and in order

to ensure the protection against water it is forbidden to mix up the parts of

different KDO adapters. The installation fibre filaments with connectors are fed

through the KDO type adapter. The fibre filament length inside the fibre

organiser is adjusted to sufficient measurement before tightening the adapter.

The adapter consists of two tightening nuts. Both nuts of the adapter are

tightened to the positive stop. The main nut against the mounting case is

tightened at first.

Fig.5. KDO832 adapter components

KDO832 is a fibre feedthrough adapter

for two 3 mm fibres.

Assemble the O-

ring 14x1.78, which

keeps the plastic halves together, to the

brass body.

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 6(11)

printed on December 17, 2002

Fibre installation

Fibre installation is a critical procedure and it should be done with carefulness.

Incorrect handling of the fibre can result in damage and degraded performance.

Example of routing the fibres can be seen in figure 6.

When working with fibre pigtails and optical connectors, remember always:

-not to exceed the minimum bending radius

-to clean the fibre connectors before connecting them with ethyl or isopropanol

alcohol and dry it with pressurised air.

-to clean the connectors every time you disconnect them

Disconnected optical connectors may emit invisible optical radiation. Avoid

direct eye exposure to the beam. Laser light, visible or invisible, can seriously

injure eyes or even cause blindness

Fig.6. KDO832 The correct way to route the fibre pigtails.

Active modules

Optical receivers

The AC68x0’s are fibre optic receiver modules for the optical nodes of Access

platform. The performance and the features has been designed for the fibre to

the curb and the fibre to the building (FTTC/ FTTB) applications. Depending on

the optical input power, there are two kind of units available

AC6810 with an optical input power range ranging from -7 dBm to -2 dBm

AC6820 with an optical input power range ranging from -3 dBm to +2 dBm

Gain control

The optical receiver module is delivered without an attenuator plug. If necessary

use an attenuator plug-in to get appropriate RF level. Attenuators of the JDA900

series type ranging from 0 dB to 20 dB in 1 dB steps are available. The

attenuator value depends not only on the optical input level but also on the

optical receiver type and the OMI. Refer to the table below.

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 7(11)

printed on December 17, 2002

Attenuator (4% OMI) Attenuator (5% OMI)

Opt. input level

(dBm) AC6810 AC6820 AC6810 AC6820

2 - JDA911 - JDA913

1 - JDA909 - JDA911

0 - JDA907 - JDA909

-1 - JDA905 - JDA907

-2 JDA911 JDA903 JDA913 JDA905

-3 JDA909 JDA901 JDA911 JDA903

-4 JDA907 - JDA909 -

-5 JDA905 - JDA907 -

-6 JDA903 - JDA905 -

-7 JDA901 - JDA903 -

Optical input power

The LED on the receivers front panel provides indication for the optical input

power.

LED on AC6810 Condition

Green Optical input power is within the nominal range

(-8.5…-1.0 dBm)

Yellow Optical input power drops below -8.5 dBm

Red Optical input power exceeds -1.0 dBm

LED on AC6820 Condition

Green Optical input power is within the nominal range

(-4.5…3.0 dBm)

Yellow Optical input power drops below -4.5 dBm

Red Optical input power exceeds 3.0 dBm

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 8(11)

printed on December 17, 2002

Element management transponder

Some of the parameters can be controlled and monitored through the

transponder interface. The transponder unit will automatically detect the current

configuration of the Access platform when the user opens the Configuration

page. The Configuration page displays a graphical view of the current

configuration similar to the actual amplifier/node layout and also generates a set

of viewer pages individual to each active device. It is advisable to begin by

selecting the Configuration page at first since it is the only way to accomplish

the viewer pages. These pages include all the programmable controls and

settings.

Status

The type of the module as well as the measured optical input level is displayed

intheintheStatus frame. The background colour of the Optical level data field

changes to indicate alarms. A green background means legal values and red is

the symbol for an alarm.

Limits

The Limits frame displays the limits after which the unit starts indicating alarms.

The values are represented as read-only information. The manufacturer sets all

the limits.

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 9(11)

printed on December 17, 2002

Optical return transmitters

There are a variety of options for transmitter modules available for the return

path applications of Access platform. The return path transmitters are available

either in 1310 nm Fabry-Perot, 1310 nm DFB or 1550 DFB versions. In addition

the platform can be equipped with CWDM transmitters. The CWDM lasers

deploy eight wavelengths in range of 1470 …1610 nm.

Gain control

The return transmitter module is delivered without an attenuator plug. If

necessary use an attenuator plug-in to give appropriate driving level for the

laser. Attenuators of the JDA900 series type ranging from 0 dB to 20 dB in 1 dB

steps are available.

In the front panel label (fig.7) is described the driving level at the test point that

gives 4 % OMI / channel. The input level should be adjusted to match this level

which is specified for each unit. For other OMI values, the needed plug

attenuator can be calculated from the formula:

20 xlog(new OMI% / 4%)

E.g. For 8 % OMI, a 6 dB higher input level is needed.

Depending on the nature of the return signal, the input level can be measured

as follows:

-When using a reference or test signal, the level of the carrier signal is

measured from the test point and it is adjusted to a value shown in the unit’s

label or calculated from it.

- When using a digital, noise like signal, the spectrum analyser’s noise marker

is adjusted to a same bandwidth as the digital signal has, and the level is

adjusted to a value shown in unit’s label or calculated from it.

Pilot

The pilot generator level corresponds to 4% OMI. Available pilot signal

frequency 4.5 MHz or 6.5 MHz can be controlled with a DIP switch on the

module’s front panel (fig.7).

ac3840ki

OFF

Fig.7. AC6840 DIP switch positions

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 10(11)

printed on December 17, 2002

Pin No. Setting Description

on Optical level: +2 dBm

1off Optical level: +1 dBm

on Pilot signal: 6.5 MHz

2off Pilot signal: 4.5 MHz

3 Not in use

4 Not in use

Table 2. Description of the DIP switch

Laser

Nominal optical powers are represented in table 2. The underlined functions are

default factory settings. With the DIP switch it is possible to reduce nominal

optical power by 1 dB. But OMI is also changed. However the product

specifications are valid only when using the nominal power.

User Manual AC1000

59300001 Rev.003

Broadband Cable Networks December 17, 2002 11(11)