Andrew Wireless Innovations Group BCEL-400 Users Manual

22. Introduction

This section describes the TPR family (19” Sub rack). The TPR is part of the
Britecell system and host all plug-in modules such as TFL-card, TLC
splitter/combiner, TFL-BSI Base Station Interface and control modules.

A TPR sub-rack, when fully equipped, can support up to 6 TFL Local Units, one 2­way splitter-combiner, two 3-way splitter-combiners, one Base Station Interface,
and one control module. Therefore this complete configuration supports up to 24
TFA Remote Units and up to 48 antennas.

23. Part description

Fig. 22 TPR912

24. Warnings

Local interfaces may not be placed next to each other; one 7te
module is always required between them.

TFL local interface cards can only be fitted in slots 1, 3, 5, 7, 9,
and 11 of the sub-rack, slot 1 being the left most one.

WARNING: any slot capable of accepting an TFL that is

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unused must be fitted with a dummy plug to avoid alarms
being generated (see Fig. 23)
WARNING: do not remove or insert any module into TPR

9

subrack, without switching the power supply off.

BRITECELL System Manual MN010-04 June 2003 Page 36 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

Fig. 23 - Dummy connector

25. Functional description

The TPR subrack provides:

• power supply to the active plug-in cards (12VDC);

• alarm logic and relays;

• mechanical housing and positioning.

25.1. Block diagram

MAINS

AC/DC
or
DC/DC
converter

backplane, logic & relays
DL UL

Fig. 24 – TPR block diagram

26. Alarms

The TPR sub-rack has a built-in alarm circuit: any fault in TFL or TFA causes a
contact relay close or open.

A sub-D 9 pins male connector at the back of the sub-rack gathers summary and
specific alarms of master/local subrack (see Tab. 6)

Fig. 25 alarm relay connector

Sub-D Male

Master sub-rack alarms

Sub-D Female

Slave sub-rack alarms

BRITECELL System Manual MN010-04 June 2003 Page 37 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

Master/Local Sub-rack Alarm status (SUB-D Male)

PIN Name Meaning Description

1 not connected

2 DL Summary Alarm Common contact

3 not connected

4 UL Summary Alarm Common contact

5 not connected

6 DL Summary Alarm

7 DL Summary Alarm

8 UL Summary Alarm

9 UL Summary Alarm

To choose in conjunction with PIN 2,
Normally Closed

To choose in conjunction with PIN 2,
Normally Open

To choose in conjunction with PIN 4,
Normally Closed

To choose in conjunction with PIN 4,
Normally Open

Tab. 6 Master sub-rack alarm connector pinout

2 - 6 = Open circuit if Local Sub rack
Downlink is in alarm

2 – 7 = Short circuit if Local Sub rack
Downlink is in alarm

4 - 8 = Open circuit if Local Sub rack
Uplink is in alarm

4 – 9 = Short circuit if Local Sub rack
Uplink is in alarm

normal condition (no alarm) Alarm Condition

Down Link

2

6

2

7

Up Link

8

4

4

9

If a slave sub-rack is connected via TSU012 Control Unit or TFLB Interconnect Link
Unit, alarms from slave/remote sub rack are also reported through the TPR back
plane at the auxiliary DB9 female connector, providing alarm relay logic similar to
the master ( see Tab. 7)

NOTE: TPR subrack provides connections for more detailed alarms, at the right
most slots (see TSU012 control unit product specification)

6

7

8

9

BRITECELL System Manual MN010-04 June 2003 Page 38 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

Slave/Remote Sub-rack Alarm status (SUB-D Female)

PIN Name Meaning Description

1 UL Summary Alarm

2 UL Summary Alarm Common contact

3 DL Summary Alarm

4 DL Summary Alarm

5 DL Summary Alarm Common contact

6 UL Summary Alarm

7 not connected

8 not connected

9 not connected

To choose in conjunction with PIN 2,
Normally Open

To choose in conjunction with PIN 5,
Normally Closed

To choose in conjunction with PIN 5,
Normally Open

To choose in conjunction with PIN 2,
Normally Closed

Tab. 7 Slave sub-rack alarm connector pinout

2 – 1 =Short circuit if Remote Sub
rack Uplink is in alarm

5 - 3 =Open circuit if Remote Sub
rack Downlink is in alarm

5 – 4 =Short circuit if Remote Sub
rack Downlink is in alarm

2 - 6 =Open circuit if Remote Sub
rack Uplink is in alarm

Normal Condition (no alarm) Alarm Condition

Down Link

Up Link

5

3

5

4

3

4

6

2

2

1

6

1

BRITECELL System Manual MN010-04 June 2003 Page 39 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

27. Installation and cabling

27.1. Location

The TPR sub-rack should be placed as near as possible the BTS or the RF repeater.
The sub-rack location should be easy to reach by the users in order to allow alarm
monitoring.

WARNING! do not close the air circulation subrack grids (top and bottom) with

9

panels or obstacles.
If the subrack mounting location does not have a good air circulation, leave at

9

least one unit (1HE) free between subracks.

27.2. Power supply

The connection to the mains has to be carried out following all the necessary
precautions, including the following:

• in accordance with diligence rules (ex. CEI rules, IEC rules, etc.);

• in accordance with the rules for the safety against direct or indirect contacts;

• in accordance with the rules for the safety against over current (short circuit,

overloading);

• in accordance with the rules for the safety against the over tension;

• the connection is to be carried out by properly trained technicians.

27.2.1. Universal mains

Universal main (85-264VAC, 50/60Hz) apply to TPR912 model only. Mains
connector is placed on the back panel (see Fig. 26 mains connector)

Fig. 26 mains connector

The TPR912 model has an internal AC/DC converter. With 220VAC power supply
the efficiency is 75%. Each TFA has a power consumption of 12W, therefore a fully
equipped configuration (6 TFLs) requires (12W x 6) / 0.75 = 96W.
This formula is helpful in verifying the overall power consumption.

BRITECELL System Manual MN010-04 June 2003 Page 40 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

27.2.2. DC negative supply

Direct current ( –72 to –36 VDC) apply to TPR922 model only. Power connector is
placed on the back panel (see
Fig. 27 VDC Connector (TPR922 only))

MALE POWER
CONNECTOR

FUSE

Fig. 27 VDC Connector (TPR922 only)

TPR922 model has an internal DC/DC converter: power consumption is the same
as above.

Direct current (16 to 24 VDC) to be applied to TPR932 model only. Power
connector is placed on the back panel (see Fig. 28 VDC Connector (TPR932 only))

MALE POWER
CONNECTOR

FUSE

Fig. 28 VDC Connector (TPR932 only)

TPR932 model has an internal DC/DC converter: power consumption is the same
as above.

BRITECELL System Manual MN010-04 June 2003 Page 41 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

27.2.3. Grounding

Ground terminals are part of power supply connectors, as showed in previous
figures (Fig. 26 mains connector, Fig. 27 VDC Connector (TPR922 only), Fig. 28
VDC Connector (TPR932 only)).
An external grounding terminal, with screw, is available at the back panel (see Fig.
29 ground)

Fig. 29 ground

28. Start up

WARNING: Verify voltage levels before connecting and powering on the

9

subrack

Please refer to system start-up section for further details.

29. Troubleshooting

The way a fuse is changed depends on the subrack version (refer to the
datasheet). One or two fuses are present on the back of the rack, which needs to
be replaced when they fail

BRITECELL System Manual MN010-04 June 2003 Page 42 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

Fig. 30 fuse

TFL-BSI RF attenuator

30. Introduction

This section describes the TFL-BSI (Base Station Interface). The TFL-BSI is part of
the Britecell system and allows the operator to optimise the signal level the BTS or
repeater and the Britecell system. It includes two independent variable attenuators
(30 dB, one dB step) for uplink and downlink RF path.
A single attenuator version is available, for downlink only or uplink only operations.

31. Part description

Fig. 31 - TFLBSI

Downlink RF input (from BTS)

Downlink attenuation settings

Downlink RF output (to TFL)

Uplink RF output (to BTS)

Uplink attenuation settings

Uplink RF input (from TFL)

32. Warnings

9

Maximum RF composite input power must not exceed 30 dBm.

9

SMA connectors must be screwed with a proper dynamometric key.

33. Functional description

33.1. Down link operation

If the RF signal coming from the BTS or repeater in downlink path has a power
level, which is not adequate to the TFL’s characteristics, an attenuator is required.

BRITECELL System Manual MN010-04 June 2003 Page 44 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

33.2. Uplink operation

The RF signal coming from the mobile through the TFA and TFL in the uplink
direction may not be an optimal level. When this is the case, the uplink attenuator
is used to prevent the BTS from being over driven.

34. Installation and cabling

34.1. TPR housing

The TFL-BSI is a modular plug-in card designed to be put in a 6 HE sub-rack (TPR
family).
The TFL-BSI interfaces with the BTS transmitter and receiver through N-female
connectors and with Britecell with SMA-female connectors.
The connection with the BTS may be direct, if the BTS’s transmitter and receiver
are separated, or through a circulator or a common path RF combiner (please refer
also to THYB section).
When the system is air interfaced through a repeater a common path RF combiner
is required in order to separate the uplink and downlink path.
The connection between TFL-BSI and Local Units may be direct or through a
combiner stage (please refer to TLC section) depending on the system’s
configuration.

35. Calculation of attenuation setting

35.1. Downlink

Calculation of Downlink TFL-BSI setting is made in order to supply Britecell Local
Unit with correct DL input power.

)(]dB[

PILILPA

−−−=

where:
P
IL
IL
P

@POI_Input

Dir.Coupler

Comb.Net

DL_BC_Max

[dBm/c]= RF power level per carrier at POI input:

[dB]= Directional coupler insertion loss (if present);

. [dB]= Combining Network insertion loss;

[dBm/c]= Max input power per carrier at Local Unit input.

35.2. Uplink

Calculation of Uplink TFL-BSI setting is made to meet BTS uplink blocking
requirements.

where:
P

LU_UL@Blocking

[dBm]= Local Unit output power when Remote Unit is at blocking
level (3 dB C/N degradation);
P

BTS@Blocking

[dBm]= BTS receiver blocking level;

SM = Safe margin (typically 3 dB).

)]([]dB[

BlockingBTSNetbCCpouplerDirBlockingULLUblkULBSI

@.om.@___

MaxBCDLNetbCCpouplerDirInputPOIDLBSI

__.om._@_

+−+−=

SMPILILPA

BRITECELL System Manual MN010-04 June 2003 Page 45 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

TLC RF combiner - splitter

36. Introduction

This section describes the TLC splitter/combiner. The TLC is part of Britecell
system and provides a family of 2-way and 3-way RF power combiners in order to
allow several local interface modules to be connected to common UL and DL RF
paths, for interfacing to the BTS.
All units have internal pads (one per path) to achieve predefined insertion loss.

37. Part description

Downlink RF input

Downlink RF

splitted outputs

Uplink RF

combined output

Uplink RF inputs

Fig. 32 TLC2502 Fig. 33 TLC2501

Downlink RF

High Band input

Downlink RF

combined output

Downlink RF

Low Band input

Uplink RF

High Band output

Uplink RF

combined input

Uplink RF

Low Band output

38. Functional description

TLC2502/3 is a two/three way splitter for downlink path and combiner for uplink
path. For insertion loss values refer to datasheets.
TLC2501 is a crossband coupler, designed to combine or split hi-band signal and
low band signal in dual band systems. Insertion loss in this case is minimal (see
datasheets).

39. Warnings

9

Maximum RF composite input power must not exceed 24 dBm.

9

SMA connectors must be screwed with a proper dynamometric key.

40. Installation and cabling

40.1. TPR housing

The TLC is a modular plug-in card, suited to be contained in a 6 HE Sub rack (TPR
family).
The 2-way TLC module interfaces with the BTS transmitter and receiver through
TFL-BSI and with TFL Local Units directly or through 3-way splitter/combiner.

BRITECELL System Manual MN010-04 June 2003 Page 47 of 78

The company has a policy of continuous product development and improvement and we therefore
reserve the right to vary any information quoted without prior notice.

THYB common path RF

combiner