User Manual

Architecture
Nortel Networks Confidential
3–52
PE/DCL/DD/0063
411–9001–063
Standard 12.07/EN September 2000
GSM/BSS V12
3.5.1.2 E–RDRX board modifications
The main modifications concerning the e–RDRX board are the following:
the removal of the 104 MHz frequency reference
the use of RXIC2 module (IF => BF transposition)
the RX dynamic extension provided by an AGC (–13 to –110 dBm)
the TX output power dynamic reduction
the integration of the dc/dc converter on the e–RDRX board
the lower power consumption (<15W)
3.5.2 Main external connections
3.5.2.1 Private PCM
A private internal PCM is used to link the e–DRX to the BCF. The proprietary
interface has the same definition as the previous internal PCM, except that the clock
is fully synchronous with the radio interface.
This bus carries the following informations:
Radio Signaling Link (RSL) and local Operation and Maintenance (O&M) on
one time slot
Traffic links on two, three, four, six or eight time slots
GSM_TIME channel on a separate time slot
The feature allows the e–DRX to be remotely controlled.
3.5.2.2 FH bus
The FH bus is connected to the various e–DRX units.
3.5.2.3 Power Supply
The e–DRX is powered by a –48V dc supply and the typical consumption is 25W.
3.5.2.4 Test links
The e–DRX has an Ethernet port and an asynchronous serial port. It also has serial
lines for emulator connections, and real time trace facilities.
3.5.2.5 RF interfaces
The e–DRX unit provides RF reception with diversity and RF transmission at low
level.