User Manual

ADCP-75-192 • Issue 1 • December 2005 • Section 3: Network and System Installation and Setup

Page 3-9

 2005, ADC Telecommunications, Inc.

6.2.9 Composite Mode

The Digivance CXD default forward gain balance is called “composite mode”. In this mode, a

composite RF signal will have gain of +42dB (Cell/SMR) and +45dBm (PCS) through the

system. The maintainer is responsible for ensuring the desired signal level into the system.

See Table 3-3 for sample input and output signal strengths:

Table 3-3. Output Signal Strengths

INPUT

(RMS AT FBHDC INPUT)

CELL/SMR OUTPUT

(RMS AT ANTENNA PORT)

PCS OUTPUT

(RMS AT ANTENNA PORT)

-2 dBm +40 dBm +43 dBm

-4 dBm +38 dBm +41 dBm

-7 dBm +35 dBm +38 dBm

As the protocol is irrelevant in this mode, the default protocol is “none”. In addition, only a

single FSC channel is activated. To sum multiple FSC channels, set the composite mode entry

to “disabled” and follow instructions on setting channels in Section 7 Tenant Configuration.

The MIB field is:

transceptBtsConnectionForwardGainTable.transceptBtsConnectionForwardGainCompositeM

odeFlag

6.2.10 Power Attenuator IDs

The BTS Connection MIB contains two fields that allow the external power attenuators to be

identified. The attenuators reside in a shelf at the top of each rack. To configure these two MIB

fields, the nomenclature described in Table 3-1. HUB Rack Numbering, should be used. This

dictates that the attenuators should be given names that indicate the shelf number and the

location on the shelf. For a given tenant, the two power attenuators must be configured with

unique IDs, where the allowable values are strings of length 1-16. If both attenuators are

configured, then software will configure the BIM to operate in duplexed mode, otherwise,

software will configure the BIM to operate in non-duplex mode. The MIB fields are:

transceptBtsControlParamsTable.transceptBtsControlParamsPowerAttenXLoc, where X = 1 or 2.

6.3 Pathtrace Format

Pathtrace is a term used to describe the 64-byte data stream that is transmitted between all DIF-

connected modules in the Digivance CXD system. The contents of the pathtrace strings have

been designed such that each set of connected tenant equipment will transmit/receive a

pathtrace string containing information about that particular tenant. The following is the format

of the pathtrace string: