T 1 Te St I N G; Synchr Onizat Ion - Aeroflex 3900 Series Option Manual

T 1 T es ti n g
Sy n c h r o n i za t i o n
The T1 T est S ystem p rovides RP BS Si gnals ( T1 Type 7 , TC H /7.2 Up link) whi ch allow BE R tests to
be carr ied out on th e r eceiver of t he base stat ion under t est. The Test S et must be synchro nized to
the base stati on f rame stru cture to per for m BE R test ing, so that the tr ansmitt ed sig nal is sent in the
corr ect t imeslot and frame s and wit hin t he speci fied alignment limit s.
The Test Set has t wo synchro nization modes, Aut o an d Pu lse. Sele ct t he r equir ed mode using the
Mode bu tton on t he B ase S tati on S y nc are a of the
Tile . A descr ipti on of the tw o mode s is pr ovided below . A block di agram has bee n pr ovided in Fi g.
8-2 for re fer ence.
Base station
under test
T1 signal to Base Station Rx
Base station
under test
Tx can be
ON or O FF
T1 signal to Base Station R x
F i g . 8 - 2 D i a g r a m o f S y n c t o B a s e S t at i o n - A u t o a n d P u l s e M o d e s
T E T R A B S T 1 S y s t e m
Extracts sync
bursts
SYNC.
RF INPUT
DETECT
Extracts sync
bursts
SYNC .
SYN C I/O
D ETECT
TET RA BS T1 Syste m ID and Sync Con figur atio n
Offsets timing of
T1 signal over
range -9999.99 to
+9999.99 symbols
PATH
OFFSET GENERATOR
MCC-MNC-BCC update (auto)
A UT O M OD E
Aligns T1 signal
to Base Station
sync pulse over
range 0 to
1,020,000 s
PU LSE
OFFSET
G ENERA TO R
PU LSE
EDG E
Output enable
Selects rising or falling
pulse edge as trigger
PU LSE M O DE
8-3
T1 SIGNAL
RF OUTPUT
Output enable
M C C_M NC _BCC
update (m anual
if no Tx)
T1 SIG NAL
RF OU TPUT