IBM 5280 Manual page 205

P
5
044
COMMUNICATION MAP
38LS XMIT/RECV CHECK
PAGE 9 OF 20
THIS IS THE RECEIVE CHECK FOR A
38LS WITH WORLD TRADE LINE PLATE
CONNECTED TO A PUBLIC SWITCHED
Connect the dB meter to
'Telephone Line l' and
'Telephone Line 2' AT THE END OF
THE EXTERNAL CABLE (See Fig 1 at
right).
Note: The Cable must be connected
to the Public Switched network
for correct dB level checking.
At this point, the remote
station should be transmitting a
constant test pattern of hex
FFFF.
Does the dB meter indicate the
value expected within a tolerance
of one dB?
Y N
1 1
1 0
X Y
MAP 3011-9
Note: For World Trade the dB
information may be obtained from
the PTT representative.
WT
line extern
Line name plate cable
cable
lead
conn color
----------------+------+------
Telephone Line 1 TB1-9 Red
Telephone Line 2 TBl-8 Green
or
White
----------------+------+------
Telephone Set 1 TBl-7 Yellow
Telephone Set 2 TBl-6 Black
Fig 1. Aid for dB level check
on the telephone lines
and at the PSN connector.
EC840874 PEC839787
MAP 3011-9