1.05 Prior
to
installation, the telephone company
must be
notified
of
the intended installa-
tion. The Universal Service Order Code
(USOC)
number for the telephone service jacks are listed
in Table 2-A. One
of
the codes
must
be
specified
for installation by the telephone company. The
FCC.
registration number and ringer equivalence
number (located on label on outside
of
data
modem)
must
also be provided.
NOTE: This data modem
(as
of
the date
of
manufacture) is
compatible
with telephone
company
communications
facilities
with
which
it
was
intended
to operate. However,
if
the
telephone
company
changes
its
communications
facilities,
equipment,
operations,
or
procedures
such
that
this
equipment
is no
longer
compatible, RIXON is
not
responsible
for
the
cost
of
modification
or
replacement
of
the data modem.
1.06 The transmit line level
of
a
TA201
C Data
Modem is determined by
an
internal adjust-
able attenuator and by a resistance connected
across programming pins
18
and
19.
A series
of
different telephone interface cable assemblies
allows the data modem to be applied
to
different
level setting arrangements:
• Adjustable (for applications not requiring
FCC registration) -uses cable
with
jumper
between pins
18
and
19.
Transmit level is
set by internal attenuator.
• Fixed loss loop -uses cable
with
866
ohms resistance between pins
18
and
19.
Transmit level is
-4
dBm maximum.
• Permissive -uses cable
with
9310 ohms
and resistance between pins
18
and
19.
Transmit level maximum is
-9
dBm.
• Programmable -uses cable
with
leads
from pins
18
and
19
to
connect to
resistance
built
into telephone company
supplied interconnection point.
NOTE: When
either
fixed
loss
loop, permis-
sive,
or
programmable level
setting
applica-
tions are used, the data modem
internal
attenuator
must
remain in factory
set
O dBm
position.
Doing
otherwise
adds
additional
attenuation
to
transmitted
signals.
ISS.
2,
BULLETIN 5214-200
D.
Private Line Service
Applications
1.07 The TA201C
_Data
Modem
service
applications for private line operation are
listed in Table
2-C.
2.
ACCESS
TO
DATA MODEM OPTIONS
2.01
The data modem is equipped
with
a number
of
options
that can be selected at the instal-
lation site
without
test
equipment or
tools
other
than a screwdriver. Option selection is determin-
ed
by the servicing telephone company and
customer. Telephone company selected
options
for private line and
ODD
network applications are
provided in Table
2-D.
User selected
options
for
p_rivat~
line and
DOD
network applications are pro-
vided
in
Table
2-E.
Read
the description
of
each
option before installing; many are interrelated.
A.
Data Modem Disassemblyand Reassembly
2.02
It is necessary to remove data modem
circuit
cards from the desk-top enclosure
to
inspect
or
install options. Use Fig.
2-1
and the
following procedure:
(a)
Use a flat-blade screwdriver
in
access slot
on bottom
of
bezel
to
pry card assembly
from case. Loosen and
disconnect
assembly
from rear housing connector.
R
E
A
D
Never use force while removing assem-
bly from case because damage may
re-
sult. Handle assembly by front panel
and card edges only. Static changes
may damage ICs.
(b)
Slide
card
assembly
from
case
while
gripping front panel. Set card assembly on a
nonconductive surface. Card assembly con-
sists
of
three
circuit
card layers separated by
nylon spacers.
(c)
Options
are
accessible
at card edges
between
circuit
card layers.
B.
Option Installation
2.03 Determine the correct option
positions
for
the particular data installation then refer
to
Fig.
2-2
for option locations and Tables
2-D
and
Pages
