LTU-2
E1 Line Termination Unit
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FEATURES
• Extended dynamic range
DESCRIPTION
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of up to 2.2 km to the
nearest repeater
• Supports up to -45 dB at
1024 kbps
• Simplex line power feed for
E1 repeaters
• Complies with ITU G.703
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• V.54 diagnostics
• V.52 test pattern generator
and ERR LED indication
• Front panel jack access
• Line protection circuit
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The LTU-2 Line Termination Unit
connects local equipment such
as PABXs and E1 multiplexers
to the E1 public network, with
complete network protection. In
addition, LTU-2 provides line
power feed for E1 repeaters
such as RPT-0. When coupled
with 14 repeaters, LTU-2
extends an E1 line up to 20 km
(12.5 miles).
LTU-2 meets all the
requirements of ITU G.703 and
is compatible with almost all PTT
provided E1 services. Surge and
line protection circuitry complies
with ITU Recommendation K.17.
LTU-2 supports up to 45 dB of
attenuation at 1024 kbps (half
the E1 bit rate). For a 22 AWG
cable this represents a
maximum distance of 2.2 km to
the nearest repeater.
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Two constant-current built-in DC
power supplies of -48 VDC and
-72 VDC (strap-selectable) are
available for the repeater DC
feed. The power feed features
current limit protection with
simplex line power on the same
E1 line. -48 VDC power feed
supports up to four RPT-0 units;
-72 VDC power feed supports up
to seven units.
Diagnostic capabilities comply
with ITU V.54 and include local
analog loopback and remote
digital loopback, activated via a
front panel switch. The PATT
switch activates an internal
511-bit pseudo-random test
pattern for complete end-to-end
integrity testing. The ERR LED
indicates each bit error detected.
Front panel jacks allow easy
network access for more
extensive testing using external
test equipment.
LTU-2 is available as a desktop
unit or as a card for installation
in the LTU-MN-114 19" card
cage (see Ordering). LTU-MN114 can accommodate up to 14
cards. An optional rack-mount
adapter kit enables installation of
one or two standalone units in a
19" rack.
• Surge protection complies
with ITU K.17
• Standalone and rack
module version
• AC or DC powered
Order from: Cutter Networks
Ph:727-398-5252/Fax:727-397-9610
www.bestdatasource.com
LTU-2
E1 Line Termination Unit
SPECIFICATIONS
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Network Interface
Data rate:
2.048 Mbps
Line code:
Bipolar, HDB3
Impedance:
Balanced:
120Ω
Unbalanced: 75Ω
Signal level:
Receive:
0 to -45 dBm
Transmit:
Balanced:
±3V ±10%
Unbalanced:±2.37V ±10%
Connector:
Balanced:
15-pin D-type,
male
Unbalanced: Two BNC
coaxial
Surge protection: Per ITU K.17
DTE Interface
Data rate:
2.048 Mbps
±50 ppm
Bipolar, HDB3
Line code:
Impedance:
Balanced:
120Ω
Unbalanced: 75Ω
Signal level:
Receive:
0 to -10 dBm
Transmit:
Balanced:
±3V ±10%
Unbalanced:±2.37V ±10%
Connector:
Balanced:
15-pin D-type,
female
Unbalanced: Two BNC
coaxial
Jitter Performance
Transparent between the
network and the DTE side
APPLICATION
 1998 RAD Data Communications Ltd.
Order from: Cutter Networks
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Diagnostics
ITU V.54 loopbacks, activated
via front panel switches
REM: Remote digital
loopback
ANA: Local analog loopback
on network side
ITU V.52 test pattern
PATT: 511 bit pseudo
random
test pattern with
Error
LED indication
Bantam jacks (front panel):
EQ-IN, EQ-OUT,
NET-IN, NET-OUT
Alarm Response
Loss of signal on DTE with
network response as AIS, or
Loss of signal on network with
DTE response as AIS
(strap-selectable)
Indicators
PWR
Power
TEST
Test
ERR
Bit Error for PATT
test
DTE-LOS DTE loss of signal
NET-LOS Network loss of signal
NET-AIS Network AIS
-3
NET-10 Bipolar violation error
check
Power Supply
115/230 VAC (±10%)
47 to 63 Hz, 13 VA;
-48 VDC (±10%) input
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Physical
LTU-2SA:
Height:
Width:
Depth:
Weight:
LTU-2R:
Dimensions:
114
Weight:
44 mm / 1.7 in
193 mm / 8.0 in
240 mm / 7.6 in
1.4 kg / 3.1 lb
fit the LTU-MNcard cage
3.6 kg / 10.1lb
Environment
Temperature: 0-50οC / 32122oF
Humidity: Up to 90%,
non-condensing
ORDERING
LTU-2SA/*
E1 Line Termination Unit,
standalone with internal power
supply
LTU-2R
E1 Line Termination Unit, card for
the LTU-MN-114 card cage
* Specify power supply:
115 for 115 VAC operation
230 for 230 VAC operation
48 for -48 VDC operation
RM-9
Hardware for mounting one or two
units in a 19" rack.
DC Feed
-48 VDC with 50, 100, 150 mA
constant current source, for
simplex line power feeding of
up to four RPT-0 units with
19 AWG cable
(strap-selectable)
-72 VDC for support of up to
seven RPT-0 units with
19 AWG cable. Available
with 115/230 VAC option
629-100-03/98
Ph:727-398-5252/Fax:727-397-9610
Specifications are subject to change without prior notice.
www.bestdatasource.com