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Cable, CompactFlash and Accessory Specifications
A-14
T3/E3 NIM Card
The
T3/E3
full
and
sub
‐
rate
NIM,
as
shown
in
Figure A
‐
17
,
is
equipped
with
1
Ethernet
(WAN)
port
that
supports
fractional
T3/E3
transmission
in
un
‐
channelized
or
clear
channel
mode
with
BNC
connectors.
User
data
are
encapsulated
in
HDLC
packets
before
being
sent
to
the
line.
Figure A-17 1-Port T3/E3 NIM Card
Cables
required
for
this
NIM
must
be
75
‐
ohm,
DS3
Type
734
or
735
coaxial.
DS3
cables
support
a
length
up
to
450
in
length.
E3
cabling
supports
a
cable
length
up
to
900
feet.
Un
‐
channelized
mode
consists
of
the
entire
T3/E3
payload
in
one
data
path,
but
with
T3/E3
framing
bits
still
in
place.
Only
one
HDLC
channel
is
used.
Throughput
of
the
un
‐
channelized
link
can
be
limited
by
using
only
a
portion
of
the
entire
payload.
Various
sub
‐
rates
are
available
to
provide
compatibility
with
major
DSU
equipment
suppliers.
Scrambling
may
also
be
enabled
as
required
for
DSU
compatibility.
Larscom
zero
suppression
is
supported.
Clear
channel
mode
presents
the
board
merely
as
the
line
driver
for
a
link
carrying
HDLC
packets
where
even
framing
bits
are
used
for
data
transfer.
The
T3/E3
framer
operates
in
bypass
mode
and
renders
the
NIM
a
line
driver.
Both
sides
of
the
link
must
have
the
same
setting
to
operate
correctly
in
this
mode.
For
more
details
on
software
configuration,
refer
to
the
XSR
User’s
Guide
.
Regulatory/Safety Compliance
The
T3/E3
NIM
complies
with
the
following
regulatory
requirements.
E3
:
FCC
Class
B,
ITU
‐
T
G.703,
G.704,
G823
and
TBR24
for
world
wide
approval,
National
Standards
testing
as
required,
and
BABT
Compliance
United
Kingdom
directive
607114.
T3
:
FCC
Class
B,
GR
‐
499
‐
CORE
is
the
Bellcore
test
procedure
that
can
be
used
for
design
validation,
JATE
Green
Book
for
Japan.
ALARM LOS
ENABLE LOF
Tx
Rx
id
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