HTU-2
HDSL Termination Unit
FEATURES
• Extends the range of
digital equipment over
existing copper cables,
eliminating the need for
repeaters or optical cables
• Range of up to 9.2 km
(5.7 miles) with H-RPT
repeater or up to 4.8 km
(3 miles) without repeater
• Data rates n x 56 or
n x 64 kbps, up to
2048 kbps
• Complies with the ETSI
HDSL standards
• Supports digital interfaces
of V.35, V.36, X.21, RS530 or built-in Ethernet
bridge
• Card version for LRS-12
modem rack with SNMP
management
• Built-in SNMP agent for
standalone and card
versions Embedded
channel for control and
diagnostics of both central
and remote units
• Supports priority bumping
• Setup, control and
monitoring via front-panel
LCD or supervisory port
• HTU-2C provides remote
power feeding option for
HTU-E1L/P and HTU-2/P
• HTU-2 and HTU-2C work
opposite HTU-E1, HTUE1L, HCD-E1 and H-RPT
• High voltage line protection
in compliance with ITU
K.21
HTU-2
HDSL Termination Unit
DESCRIPTION
•
•
•
•
Using HDSL technology, HTU-2
extends the range of digital
equipment up to 4.8 km (3.0
miles) over 24 AWG (0.5 mm),
4-wire copper cable. Using the
HDSL repeater extends the
range up to 8.4 km (5.2 miles)
between the central office and
customer premises.
HTU-2 eliminates the need for
repeaters or optical cable in the
last mile (local loop) or in the
campus network environment.
Using advanced equalization,
adaptive-filtering, echo
cancellation technology and
2B1Q line coding, HTU-2
compensates for line
impairments, bridge taps and
mixed cabling. High immunity to
background noise enables
transmission of multiple HDSL
lines via the same physical
cable.
APPLICATION
•
Two clock modes are available:
− Internal - available only when
the unit is configured as
“CENTRAL”. In this mode, the
internal clock generator provides
clock to the digital interface and
the HDSL line.
− External - available when the
unit is configured as either
“CENTRAL” or “REMOTE”. In
“CENTRAL” mode, the clock is
recovered from the digital
interface and passed to the
HDSL interface. In “REMOTE”
mode, the clock is recovered
from the HDSL interface and
passed to the digital interface.
Setup, control and monitoring of
status and diagnostics
information can be performed
using one of the following:
− Front panel LCD with three
push buttons, using
menu-driven
management
− ASCII terminal connected to
the async control port using
command line interpreter
− SNMP management station
connected to the async
control port, using Serial Link
Interface Protocol (SLIP).
•
•
•
•
The priority bumping feature
allows the user to select the
timeslot priority (high or low) in
case one of the HDSL lines is
down.
HTU-2 is available as a
standalone unit or as a
rack-mount card (HTU-2C) for
the LRS-12 modem rack with
SNMP management.
HTU-2 is available in either AC
or DC version and can be
mounted in a standard 19" rack
using special hardware. One or
two HTU-2 units can be mounted
side-by-side.
The HTU-2C card can provide a
remote power feed for an
HTU-E1L/P or HTU-2/P unit. For
the remote power feeding option,
a standalone power supply,
LRS-PS-FEED, should be
ordered separately.
Figure 1. Central Site Application with SNMP Management
HTU-2
HDSL Termination Unit
SPECIFICATIONS
•
•
HDSL Interface
Line code: 2B1Q
Signal format:
1168 kbps on each pair
Transmit pulse shape:
ETSI ETR-152
Equalizer:
Automatically adaptive
Transmit signal power:
+13.5 dBm ± 0.5 dBm
Loop loss: 27 dB max at
150 kHz (584 kbaud)
Return loss: 16 dB min
40 kHz to 292 kHz at 135Ω
(584 kbaud)
Connector: RJ-45
Range: (without noise)
Without repeater:
up to 3.8 km/2.4 miles over
26 AWG/0.4 mm
up to 4.8 km / 3 miles over
24 AWG / 0.5 mm
With repeater between central
and remote units:
up to 7.2 km / 4.5 miles over
26 AWG / 0.4 mm
up to 9.2 km / 5.7 miles over
24 AWG / 0.5 mm
Digital Interface
Data rate: n x 56 or n x 64 kbps
(n=1,2..,31,32)
Type and connectors:
V.35: via 34-pin female
connector or via 25-pin D-type
female connector
V.36/RS-449: via 37-pin D-type
female connector via an
adapter cable provided with the
product
X.21: via 15-pin D-type female
connector
•
•
•
RS-530: via 25-pin D-type
female connector
E1 (2048K): via RJ-45, balanced
and two BNC connectors,
unbalanced
Ethernet: via RJ-45 or BNC
connector (ordering option)
Diagnostic and Performance
Monitoring
HDSL performance monitoring:
CRC statistics
Loopbacks:
Local HDSL loopback toward
the local DTE
Remote loopback
Alarm buffer size: 100 events
Dry relay contact:
For HTU-2C only, via a CM-2
connector
Supervisory Port
For HTU-2:
Interface: V.24/RS-232
Type:
DCE
Format:
Async 7 or 8 bits
Parity: odd, even or none
Baud rate:
300, 1200, 2400, 4800, 9600
with autobaud detection
Connector:
9-pin D-type, female
For HTU-2C:
Via CM-2 connector
Indicators
HDSL LOS − Sync loss (per
line)
TD
− Transmit data
RD
− Receive data
ALM
− Alarm buffer full
TST
− Test mode
Figure 2. Point-to-Point Application
•
•
•
•
•
Line Protection
According to ITU K.21
Power Supply (Standalone)
AC:
100 ÷ 240 VAC
(±10%),
47 to 63 Hz
DC:
-36 ÷ -72 VDC
Remote: from the LRS-PSFEED
Power Consumption
4.5W (both HTU-2 and HTU-2C)
Physical
HTU-2:
Height: 4.4 cm / 1.7 in (1U)
Width: 21.5 cm / 8.5 in
Depth: 24.0 cm / 9.6 in
Weight: 1.4 kg / 3.5 lb
HTU-2C:
Dimensions: fits the LRS-12
modem rack
Weight:
375 g / 0.8 lb
Environment
Temperature: 0-50°C / 32-122°F
Humidity:
Up to 90%,
non-condensing
HTU-2
HDSL Termination Unit
ORDERING
HTU-2/N/*/&/+
HDSL Termination Unit, standalone
version
HTU-2CF/N/&/+
HDSL Termination Unit, card for
ETSI
version of LRS-12 rack
HTU-2CB/N/&/+
HDSL Termination Unit, card for
ANSI version of LRS-12 rack
*
Specify power supply:
AC for 100 ÷ 240 VAC
48 for -48 VDC
& Specify DTE interface:
V35 for V.35 interface
V36 for V.36 interface
X21 for X.21 interface
530 for RS-530 interface
E1 for G.703 (2048K) interface
UTP for Ethernet with RJ-45
connector
BNC for Ethernet with BNC
connector
+ Specify P for remote power
feeding support
RM-17
Special hardware for mounting one
or two HTU-2 standalone units in a
19" rack
654-100-06/99
 1999 RAD Data Communications Ltd.
Specifications are subject to change without prior notice.