PairGain HIGAIN HRU-412 User manual

HIGAIN REMOTE UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
SECTION 150-412-182-01
Revision History of This Practice
Revision 01- December 22, 1997
A) Initial Release
Model List Number Part Number
HRU-412 8B 150-1103-82

Revision 01 December 22, 1997 150-412-182-01
ii PairGain Engineering - Plant Series HRU-412 List 8B
©Copyright 1997 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.
Information contained inthis document is company private to PairGain Technologies,Inc.,
and shall not be modified, used, copied, reproduced or disclosed in whole or in part without
the written consent of PairGain.
Other product names mentioned in this practice are used for identification purposes only
and may be trademarks or registered trademarks of their respective companies.

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HRU-412 List 8B PairGain Engineering - Plant Series iii
USING THIS TECHNICAL PRACTICE
Two types of messages, identified by icons, may appear in the text.
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the
possibility of personal injury.

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TABLE OF CONTENTS
Overview _______________________________________________ 1
Application _____________________________________________ 2
Specifications ___________________________________________ 3
Functional Description____________________________________ 4
Operational Capabilities........................................................... 4
Front Panel Features ................................................................ 5
Back Panel Features................................................................. 8
Local Powering........................................................................ 9
Installation ____________________________________________ 10
Unpack and Inspect the Shipment.......................................... 10
Install the HRU-412 List 8B.................................................. 10
Installation Test...................................................................... 12
Configure, Provision, and Monitor Performance _____________ 13
Connect a DumbTerminal...................................................... 13
Log On and Use the Menus ................................................... 14
View Span Status..................................................... 15
Set Clock ................................................................. 16
System Settings ....................................................... 17
View Performance Data .......................................... 18
View 7 Day History................................................. 19
View Alarm History................................................ 20
Loopbacks _____________________________________________ 22
Certification and Warranty_______________________________ 25
VCCI Certification................................................................. 25
UL Listing.............................................................................. 25
Warranty ................................................................................ 26

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Technical Support _______________________________________27
Phone or Fax...........................................................................27
Returns....................................................................................27
World Wide Web....................................................................28

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HRU-412 List 8B PairGain Engineering - Plant Series 1
OVERVIEW
The PairGain®HiGain®Remote Unit Model HRU-412 List 8B is the remote
end of a repeaterless T1 transmission system. An HRU-412 List 8B connects
to a HiGain Line Unit (such as the HLU-319 List 4B), creating a HiGain
system which provides 1.544 Mbps transmission on two unconditioned
copper pairs covering 3658 m of 0.51 mm wire or 2743 m of 0.4 mm wire,
including bridge taps and gauge changes.
A HiGain system utilizes 2B1Q High-bit-rate Digital Subscriber Line
(HDSL) transmission technology. The HRU-412 List 8B complies with
ANSI T1E1.4, T1.403-1989, and T1E1.4/92-002R2 technical standards and
recommendations. The HRU-412 List 8B mounts in a single slot of an
industry standard 400 Mechanics type shelf. The system complies with
Transport System Generic Requirements (TSGR) common requirements
TR-TSY-000499.
The HRU-412 List 8B features:
•ANSI T1.403 DS1 Customer Interface (CI)
•Front panel DS1 and HDSL LEDs
•Front panel loopback button
•Signature resistance on DS1 and HDSL ports
•Generic and addressable repeater Loopback activation codes
•Metallic Smart Jack loopback (conforms to TR-TSY-000312)
•Provisioning switches for customer premise equipment (CPE) current,
receive (RCV) level, and transmit loss of signal (TLOS) initiated
loopback or alarm
•Front panel jacks for test access
•Craft port
•Front panel HDSL margin threshold indicator for each loop
•Secondary lightning and power-cross protection on HDSL and DS1
interfaces
•784 kbps full-duplex 2B1Q HDSL transmission on each of the two pairs
•DS0 blocking support

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APPLICATION
A HiGain system, consisting of a HiGain line unit and a HiGain remote unit,
provides a quick and cost-effective way of delivering T1 High Capacity
Digital Service (HCDS) to customers over copper pairs. The HiGain system
can be deployed on two unconditioned, non-loaded copper pairs without
repeaters, and without the need for bridged tap removal or binder group
separation.
The general guidelines for HiGain system usage is that each loop have less
than 35 dB of loss at 196 kHz, with 135 ohm driving and terminating
impedances.
Table 1 provides a guide for the loss over various cable gauges at 196 kHz
and 135ohms. The table appliestothe HDSL cable pairs betweentheHiGain
line unit and the HiGain remote unit. Without specific loop insertion loss
data, add 3 dB for each bridged tap and 1 dB for each cable gauge change.
The dc cable resistance determines the simplex powering resistance path of
the loops. The maximum allowable resistance for a HiGain system is
800 ohms over two HDSL simplex loops. This means, for example, where
3.7 km of 0.51 mm wire equals 34.08 dB (insertion loss), resistance is at
622 ohms which is well below the limit of 800 ohms.
A HiGain system operates with a variety of other T1, POTS, Digital Data
Service (DDS) equipment or other HiGain systems sharing the same cable
binder group. HiGain systems provide temporary or permanent DS1 service
and can provide a means of deploying service in advance of fiber-optic
transmission systems.
Table 1. HDSL Loss over Cables
Cable Gauge Loss at 196 kHz
(db/km) Ohms per km
0.4 mm 12.7 272.3
0.51 mm 9.3 170.6
0.61 mm 7.2 105
0.91 mm 5.1 52.5

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SPECIFICATIONS
HDSL
Line Code 784 kbps 2B1Q full duplex
Output +13.5 dBm + 0.5 dBm at 135 ohms
Line Impedance 135 ohms
Startup Time 15 seconds (typical), 60 seconds (maximum)
Maximum Provisioning Loss
35 dB at 196 kHz, 135 ohms
Line Clock Rate
Internal Stratum 4 clock
Power Consumption
4 watts (typical), 4.9 watts (maximum)
Electrical Protection
Secondary surge and power-cross protection on all DS1 and HDSL ports
Environmental
Operating Temperature - 40° C to + 65° C
Humidity 5 to 95% (non-condensing)
Mounting
Single-wide 400 Mechanics type shelf
DS1
One-way Delay < 220 microseconds per HDSL span
Line Impedance 100 ohms
Pulse Output Level 0 dB (RLEV = 0), -15 dB (RLEV = 15)
Pulse Input Level > -22.5 dB
Line Rate 1.544 Mbps + 200 bps

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Output Wander
(MTIE and TVAR) Compliant with Section 7.2.1 of the
T1X1.3/90-026R7 SONET committee report
Line Format AMI, B8ZS, or ZBTSI
Frame Format ESF, SF, or unframed
Dimensions
Height: 14.22 cm
Width: 3.55 cm
Depth: 14.22 cm
Weight 511 g
FUNCTIONAL DESCRIPTION
This section describes the functions of the HRU-412 List 8B.
Operational Capabilities
HiGain utilizes PairGain’s 2B1Q HDSL transceiver system to establish two
full-duplex 784 kbps data channels between the HLU-319 List 4B and a
remotely mounted HRU-412 List 8B. This provides a total capacity of 1.568
Mbps between the two units. PairGain’s HDSL technology provides full-
duplex services at standardT1 ratesovercopper wires between the HLU-319
List 4B and the HRU-412 List 8B, which comprise one HiGain system.
The HRU-412 List 8B power supply converts a local -48 Vdc input to
voltages and currents required for internal use. The power supply generates
+5 Vdc output.

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Front Panel Features
Figure 1 shows the front view of the HRU-412 List 8B. Table 2 describes the
HRU-412 List 8B front panel components.
Figure 1. HRU-412 List 8B Front Panel

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Table 2. HRU-412 List 8B Front Panel Components
Name Function
Test points Not applicable.
Receive
(RCV) and
transmit
(XMT) jacks
Provide splitting and monitor access to the CPE DS1 interface. The jacks
are transformer isolated from the CPE DS1 metallic interface.
Alarm LEDs REM LOS LED lights red to indicate a loss of signal (LOS) at the T1 input
to the HLU-319 List 4B. This LOS condition causes the HRU-412 List 8B
to transmit the alarm indicating signal (AIS) pattern toward the CPE.
LOC LOS LED is lit red to indicate a loss of signal (LOS) at the T1 input to
the HRU-412 List 8B. This LOS condition transmits the AIS pattern toward
the DSX-1 (TLOS Disabled) or to execute a logic loopback in the HRU-412
List 8B (TLOS Enabled).
Loopback
(LB) LEDs NETLEDlightsgreentoindicatetheHRU-412List8Bisinaloopbackstate where the signal from the network is looping back to the network.
CISLEDlightsyellowtoindicatetheHRU-412List8Bis inaloopbackstate
in which the signal from the customer interface (CI) is looping back to the
CI.
Code LEDs B8ZS LED lights green to indicate that the user DS1 code option is set to
B8ZS.
AMI LED lights yellow to indicate that the user DS1 code option is set to
AMI.
BPV LED lights red to indicate that the user DS1 code option is set to BPV.
If the user DS1 code option is set to AUTO, the lit LED indicates what DS1
signal isbeingreceived.Notethatthesesettings aremadeon theHLU-319
List 4B.
Framing
LEDs ESF LED lights green to indicate that the framing pattern of the received signal is Extended Super Frame (ESF).
SF LED lights yellow to indicate that the framing pattern of the received
signal is Super Frame (SF).
ERR LED lights red to indicate that a DS1 frame error has occurred.
No frame LED lights when the HRU-412 List 8B input pattern is unframed
or when the framing option is set to UNFR (unframed). Note that this
settings is made on the HLU-319 List 4B. (Continued)

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HDSL LEDs LP1 OK LED flashes green while HDSL Loop 1 is synchronizing with the
HLU-319 List 4B. The LED lights green to indicate that loop 1 is properly
synchronized with the HLU-319 List 4B.
LP1 MAR LED lights yellow when the HRU-412 List 8B margin on HDSL
loop 1 has dropped below the user-defined margin threshold value. This
indicator flashes yellow to indicate that a loss of sync word (LOSW) exists
between the HLU-319 List 4B and the HRU-412 List 8B.
LP1 ES LED flashes red every second that a CRC error is detected on loop
1 from the upstream module.
LP2 OK LED flashes green while HDSL Loop 1 is synchronizing with the
HLU-319 List 4B. The LED lights green to indicate that loop 2 is properly
synchronized with the HLU-319 List 4B.
LP2 MAR LED lights yellow when the HRU-412 List 8B margin on HDSL
loop 2 has dropped below the user-defined margin threshold value. This
indicator flashes yellow to indicate that a loss of sync word (LOSW) exists
between the HLU-319 List 4B and the HRU-412 List 8B.
LP2 ES LED flashes red every second that a CRC error is detected on
loop 2 from the upstream module.
Craft port Provides a RS-232 connection port for a dumb terminal. The dumb
terminalallowsaccesstothemaintenance,provisioning,andperformance
monitoring menus and screens.
Card handle Pull the card handle to remove the HRU-412 List 8B from the shelf slot.
Product label Provides a customer-specific product label for the HRU-412 List 8B.
Table 2. HRU-412 List 8B Front Panel Components (Cont.)
Name Function

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Back Panel Features
The HRU-412 List 8B back panel features are shown in Figure 3. Table 3
describes the features.
Figure 2. HRU-412 List 8B Back Panel (Rear View)

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Local Powering
The HRU-412 List 8B unit is local powered. The -48 Vdc local power supply
must have a 83 mA output current capacity (4 W) to power each HRU-412
List 8B.
A Teltrend WPS-2005 Wall-Mount Power Supply, or equivalent, is capable
of powering two HRU-412 List 8B units.
Table 3. Back Panel User Options
Switch Setting Function
TLOS-LB DIS Does not allow theHRU-412 List8B toenteritslogic loopback state
whena loss of theT1XMT signalfromthe CPE causesthe HLU-319
List 4B to transmit the AIS signal toward the DSX-1.
EN Allowsthe HRU-412 List 8B to enterits logicloopback state when a
loss of the T1 XMT signal from the CPE causes the HLU-319 List 4B
List 4B to transmit the AIS signal toward the DSX-1. While in this
loopbackstate,theHRU-412List8BtransmitstheAISsignaltoward
the CPE and returns the network signal back to the network. The
HLU-319 List 4B displays TLOS in its front panel display. This
conditionremainsuntilavalidT1signalisreceivedfromthe CPEor
until the 3-in-5 in-band loopdown command is issued. Once the
TLOS initiated loopback occurs, it will not reoccur until the CPE T1
signal has been reapplied and then removed. This feature prevents
theHRU-412 List 8B from oscillating into and outofTLOSloopback
when a loopdown command is issued in the absence of a T1 signal
from the CPE. This TLOS option must never be enabled when the
HRU-412 List 8B is used with old line units that do not support this
feature. These older line units (List 6 and under) cannot loopdown
an HRU that is in a TLOS loop-up state when they receive the 3-in-5
in-band loopdown command.
RLEV 0Configures the T1 RCV level to 0 dB. This sets the T1 output signal
level from the HRU-412 List 8B toward the CI to 0 dB. Use this
setting when the HRU-412 List 8B is not functioning as a NID but is
connected to an external NID. It allows the external NID to set the
appropriate NI level.
15 ConfigurestheT1RCVlevel to-15dB.ThissetstheT1outputsignal
level from the HRU-412 List 8B toward the CI level to -15 dB. This
setting is recommended when the HRU-412 List 8B functions as a
NID.

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INSTALLATION
This section describes how to install the HRU-412 List 8B.
Unpack and Inspect the Shipment
Upon receipt of the equipment:
1Unpack the container and visually inspect the product for signs of
damage. If the equipment has been damaged in transit, immediately
report the extent of the damage to the transportation company and to your
sales representative.
2Verify the contents using the packing list to ensure complete and
accurate shipment.
If you must store the equipment for a prolonged period, store it in the
original container.
Install the HRU-412 List 8B
The HRU-412 List 8B mounts in PairGain’s HRE-420 single width, single
mount remote indoor enclosure.
For outdoor applications, the HRU-412 List 8B mounts in the following
shelves:
•HRE-454 (four-unit)
•HRE-450 (single-unit)
The HRU-412 List 8B is also compatible with industry standard 400
Mechanics type shelves.
The HRU-412 List 8B pinouts are shown in Figure 3. The active pins are
shown in black.

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Figure 3. HRU-412 List 8B Pinouts

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To install the HRU-412 List 8B:
1Ensure that the shelf is correctly mounted and wired (refer to the shelf’s
technical practice).
2Slide the HRU-412 List 8B into the card guides for the desired slot, then
push the unit back until it touches the backplane card-edge connectors.
3Place your thumbs on the HRU-412 List 8B front panel and push the
HRU-412 List 8B into the card-edge connector until it is entirely within
the card guides.
Installation Test
Perform the following procedure to test the HRU-412 List 8B.
1Pressthe loopback button (seeFigure 2for the location of this button) for
at least five seconds.
Verify that the LB NET LED is lit green, indicating that the HRU-412
List 8B is in a digital (NREM) loopback state. If possible, verify that the
HLU-319 List 4B front panel displays NREM.
2Have the CO transmit a T1 test signal to the HLU-319 List 4B and
measure the return (loop) signal to verify it is error free.
If the signal is not error free, remove the HRU-412 List 8B from
loopback by pressingthe loopbackbutton for fiveseconds. The LB NET
LED should be off.
3Have the COsend the HLU-319 List4B 4-in-7in-band loop-up (NLOC)
for five seconds.
If possible, verify that the HLU-319 List 4B front panel displays NLOC.
4Repeat step 2.
If the test passes, a problem exists in the HDSL cable pair(s) or in the
HRU-412 List 8B. If the test fails, the problem is at the CO.
5Check that the proper ports are in use for the HDSL and DS1 pair by
using an ohm-meter to verify that the HDSL ports have a 180k transmit-
to-receive resistive signature and that the DS1 ports have a 15 ohm
transmit-to-receive resistive signature.
Measure the return (loop) signal to verify it is error-free.

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CONFIGURE, PROVISION, AND MONITOR PERFORMANCE
The following sections describe how to perform configuration, provisioning
and performance monitoring functions using the HRU-412 List 8B menus
and screens.
Connect a DumbTerminal
To connect a dumb terminal:
1Connect a standard 9-pin serial terminal cable to the Craft (RS-232) port
(DB-9 female connector) on the HRU-412 List 8B. See Figure 4 for the
wiring configuration.
Figure 4. HRU-412 List 8B Craft Port Wiring Configuration
2Connect the other end of the terminal cable to the console port on the
dumb terminal.

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3Configure the dumb terminal to the following communication settings:
•1200 to 9600 baud (9600 baud preferred)
•no parity
•8 data bits
•1 stop bit
•hardware flow control to OFF
Log On and Use the Menus
This section describes how to log on and access the menus and screens using
the dumb terminal.
1Press the spacebar several times to active the autobaud feature and to
display the Main Menu.
2Access options on the Main Menu by typing the letter of the desired
option.
HI-GAIN HRU-412 MAINTENANCE TERMINAL MAIN MENU (ver V4.2R-008B)
A. VIEW SPAN STATUS
B. SET CLOCK
C. SYSTEM SETTINGS
D. VIEW PERFORMANCE DATA
E. VIEW PERFORMANCE HISTORY
F. VIEW ALARM HISTORY