CopperOptics PairGain HiGain HRU-512 User manual

HIGAIN REMOTE UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™150-512-100-03d¨
SECTION 150-512-100-03
Model List Number Part Number CLEI Code
HRU-512 1 150-1253-01 T1LIEPNRAA
L
TELEPHONE CO PROPERTY
OK
MAR
ES
ESF
SF
ERR
ZS
AMI
BPV
B8
NET
CI
LOS
LOS
L
P
1
C
O
D
E
C
I
L
I
N
E
M
O
N
C
I
L
I
N
E
M
O
N
L
O
C
R
E
M
F
R
M
R
S
X
M
T
R
C
V
L
B
A
L
M
+
-
60 mA
MON
2
3
2
HDSL
DS1
HRU 512
H G REM UNIT
IAIN

150-512-100-03, Revision 03
ii September 25, 1998 HRU-512 List 1
Revision History of This Practice
USING THIS PRACTICE
Two types of messages, identified by icons, appear in the text.
©Copyright 1998 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks HiGain of PairGain Technologies, Inc.
Information containedin thisdocumentis 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.
Revision Release Date Revisions Made
01 August 16, 1994 Initial Release
02 September 5, 1995 Modified and updated
03 September 25, 1998 Modified and updated
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or
the possibility of personal injury.

150-512-100-03, Revision 03
HRU-512 List 1 September 25, 1998 iii
TABLE OF CONTENTS
Overview _______________________________________________ 1
Applications ____________________________________________ 2
Functional Description____________________________________ 3
Operational Capabilities........................................................... 3
Front Panel...............................................................................5
Rear Panel Features..................................................................8
Local and Line Power............................................................10
Installation ____________________________________________ 11
Unpack and Inspect the Shipment.......................................... 11
Install the HRU-512 List 1..................................................... 11
Installation Test...................................................................... 14
Provisioning........................................................................... 15
Connect a Maintenance Terminal..........................................15
Log On and Use the Menus ................................................... 17
Loopbacks.............................................................................. 25
Specifications __________________________________________ 29
Abbreviations __________________________________________ 30
Product Support________________________________________ 31
Technical Support.................................................................. 31
Warranty ................................................................................ 32
FCC Compliance.................................................................... 32

150-512-100-03, Revision 03
iv September 25, 1998 HRU-512 List 1
LIST OF FIGURES
Figure 1. HRU-512 List 1 Block Diagram .............................................5
Figure 2. HRU-512 List 1 Front Panel ...................................................6
Figure 3. HRU-512 List 1 Rear Panel.....................................................9
Figure 4. HRU-512 List 1 Edge Connector Pinouts.............................14
Figure 5. DB-9 Connector Pinouts .......................................................16
Figure 6. Remote Log on Screen..........................................................18
Figure 7. Main Menu Local Log On.....................................................19
Figure 8. Span Status Display...............................................................20
Figure 9. System Settings Menu...........................................................21
Figure 10. Performance Data................................................................22
Figure 11. 7 Day History ......................................................................23
Figure 12. Alarm History Screen..........................................................24
Figure 13. HiGain-FT1 Loopback Configurations...............................28

150-512-100-03, Revision 03
HRU-512 List 1 September 25, 1998 v
LIST OF TABLES
Table 1. HRU-512 List 1 Front Panel Components ............................. 7
Table 2. Rear Panel Components ........................................................10
Table 3. HRU-512 List 1 Alarm History Screen Definitions ..............24

150-512-100-03, Revision 03
vi September 25, 1998 HRU-512 List 1

150-512-100-03, Revision 03 Overview
HRU-512 List 1 September 25, 1998 1
OVERVIEW
The PairGain®HiGain®Remote Unit Model HRU-512 List 1 is the remote
end of a single pair repeaterless fractional T1 (FT1) transmission system. or
in equivalent enclosure manufactured by PairGain Technologies. When used
in conjunction with the HiGain Line Unit (HLU) the system provides 784
kbps transmission on one unconditioned copper pair over the full Carrier
Service Area (CSA) range. The CSA encompasses approximately 12000 feet
of AWG 24 or 9000 feet of AWG 26 wire, including bridged taps and gauge
changes. This HiGain system utilizes 2B1Q High-bit-rate Digital Subscriber
Line (HDSL) transmission technology as recommended by Bellcore
TA-TSY-001210.
The HRU-512 List 1 complies with ANSI T1.403-1989 and
T1E1.4/92-002R2 technical standards and recommendations. The
HRU-512 List 1 mounts in a single slot of any industry standard 400
mechanics shelf. The system also complies with TR-TSY-000063 Network
Equipment Building System (NEBS) Generic Equipment requirements, and
Transport System Generic Requirements (TSGR) common requirements
TR-TSY-000499.
The HRU-512 List 1 features:
•ANSI T1.403 DS1 Customer Interface
•HDSL Line or Local Power Options
•Front Panel DS1 and HDSL Status Display Indicators
•Extensive Loopback Capabilities
•Metallic NREM Loopback. Conforms to
TR-TSY-000312
•Provisioning Switches for CPE current, RCV LBO and XMT LOS
Initiated Loopback or AIS
•Front Panel Jacks for Test Access
•RS-232 Craft port
•CPE Current Monitor Test Points
•Front Panel HDSL Margin Threshold Indicator
•Lightning and Power Cross Protection on HDSL and DS1 Interfaces

Applications 150-512-100-03, Revision 03
2 September 25, 1998 HRU-512 List 1
•784 kbps Full-Duplex 2B1Q HDSL Transmission on 1 Pair
•Payload Bandwidth Selectable from 128 kbps (2 channels) to 768 kbps
(12 channels) in increments of 128k
•Provisional Robbed Bit (RBS) or Clear (CLR) Signaling for Each DS0
Channel.
APPLICATIONS
The primary application of the HiGainFractional System is to provide a quick
and cost-effective way of delivering FT1 High Capacity Digital Service
(HCDS) to customers over a metallic cable pair. The HiGain system can be
deployed on one unconditioned, non-loaded wire pair without repeaters, and
without the need for either bridged tap removal or binder group separation of
other pairs providing FT1 services.
The general guidelines, on which the CSA deployments rules are based,
require that the HDSL HiGain loop have less than 35 dB of loss at the 2B1Q
line rate of 196 kHz, at 135 Ωsource and load impedances.
The HiGain system operates with any number of other T1, POTS, Digital
Data Service (DDS) or other HiGain Systems sharing the same cable binder
group.

150-512-100-03, Revision 03 Functional Description
HRU-512 List 1 September 25, 1998 3
FUNCTIONAL DESCRIPTION
This section describes the functions of the HRU-512 List 1.
OPERATIONAL CAPABILITIES
HiGain utilizes PairGain’s 2B1Q HDSL transceiver system to establish a
full-duplex784kbpsdatachannelsbetween theHLU andaremotelymounted
HRU-512 List 1. See Figure 1 for the HRU-512 List 1 block diagram.
When the HRU-512 List 1 is line powered, it converts the metallic 130 Vdc
line voltage to the 5 V and -5 V power required by the HRU-512 List 1
circuitry. When the HRU-512 List 1 is locally powered from -48 V, an
additional 30 V power supply is created. This provides a 60 mA simplex
current source to power an external NID (Network Interface Device) if the 60
mA I-CPE current option is enabled.
The HRU-512 List 1 dissipates 5 Watts of power and may consume up to
6.5 Watts when feeding 60 mA of simplex current to the CI.
Use caution when the HRU-512 List 1 is used to power external
CSUs. Some CSUs require more output voltage than the 30
Volts provided by the HRU. Also, the HRU can not power both
a NID and a CSU at the same time.
The 60 mA option should never be turned on if the
HRU-512 List 1 is line powered. This could overload the
system’s power capabilities and adversely affect its
performance.

Functional Description 150-512-100-03, Revision 03
4 September 25, 1998 HRU-512 List 1
Figure 1 shows a block diagram of the HRU-512 List 1.
Figure 1. HRU-512 List 1 Block Diagram
The HRU-512 List 1 is provisioned at the HLU by the BANDwidth option to
process from 2 to 12 DS0 channels (active channels). The unused channels
are replaced by either 7F or FF according to the setting of the IDLE option.
The active channelscan also be provisionedto be contiguousor alternate. The
signaling mode of each of the active channels can be optioned for either
Robbed Bit (RBS), as is required for voice channels, or Clear (CLR), which
is normally used for data applications.
If the RS-232 port of an HRE-421 remote enclosure is used to
access the HRU-512 List 1, a null modem cable adapter must
be used since the HRE-421 port is configured as DTE.
XMT
LINE
CI
MON
HDSL1
XCVR
13
7
T1
FRAMER
B8ZS
AMI
ESF
SF
OK
ES
LB
R
330K
T
HDSL
S1
17
35
1
CIRCUIT
CHASSIS
-48VDC
GROUND
GROUND
MAR
POWERSUPPLY
MICROPROCESSOR
LOGICLOOPBACK
CLOC
BPV
ERR
LOS
REM
LOC
RLBO 0
-15
TLOS-LB DIS
EN
DEMUX
MUX
RS-
232
METALLIC
LOOPBACK
NREM
5
15
1
A
R1
DS1/RCV
DS1/TX
T1
(+)
I-CPE
T
R
(-)
0
60
1
+
-60mA MON
RCV
LINE
CI
MON

150-512-100-03, Revision 03 Functional Description
HRU-512 List 1 September 25, 1998 5
FRONT PANEL
Figure 2 shows the front view of the HRU-512 List 1. Table 1 describes the
HRU-512 List 1 front panel components.
Figure 2. HRU-512 List 1 Front Panel
HRU 512
HiGain FT1 REMOTE
DS1
LOS
LOS
A
L
M
60mA
MON
R
E
M
L
O
C
R
C
V
C
I
L
I
N
E
M
O
N
L
B
NET
CI
C
I
L
I
N
E
M
O
N
X
M
T
C
O
D
E
F
R
M
B8
ZS
AMI
BPV
ESF
SF
ERR
HDSL
OK
MAR
ES
R
S
2
3
2
PairGain
L
TELEPHONE CO PROPERTY
Loopback (LB) LEDs
Code LEDs
Framing (FRM) LEDs
Alarm (ALM) LEDs
Loopback (LB) button
Test points
Receive (RCV)
and Transmit (XMT)
Access Jacks
RS-232
craft port
Card handle
HDSL LED

Functional Description 150-512-100-03, Revision 03
6 September 25, 1998 HRU-512 List 1
Table 1. HRU-512 List 1 Front Panel Components
Name Function
Test points Allow the 60 mA I-CPE current option to be measured. The current
flowing is related to the voltage measured across the + and - test points
by the following relationship: CPE CURRENT = 1 mA/1 mV. Typical
readings range from 55 to 65 mV which equate to a 55 to 65 mA current
range.
Receive
(RCV) and
Transmit
(XMT) Access
Jacks
Provides splitting and monitoring access to the CPE DS1 interface. See
Figure 2 for circuit details. 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.
LOC LOS LED lights red to indicates a loss of signal (LOS) at the T1
input to the HRU-512 List 1. This LOS condition transmits the AIS
pattern toward the D4 channel bank on the provisioned time slot only
(according to the user selected bandwidth). Non-provisioned time slots
are not affected.
Loopback
(LB) LEDs
NET LED lights green to indicate the HRU-512 List 1 is in a loopback
state where the signal from the network is looping back to the network.
CI LED lights yellow to indicate that the HRU-512 List 1 is in a loopback
state in which the signal from the Customer Interface (CI) is being
looped back to the CI (CLOC).
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 LED is on to indicates
what DS1 signal is being received. These settings are made on the HLU.
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 8 input pattern is unframed
or when the framing option is set to UNFR (unframed). Note that this
settings is made on the HLU.

150-512-100-03, Revision 03 Functional Description
HRU-512 List 1 September 25, 1998 7
HDSL
OK LED lights green to indicate that the HDSL loop is synchronizing
with the HLU. A solid green state indicates that the loop is properly
synchronized with the HLU.
MAR LED lights yellow to indicate that the HRUs S/N MARgin on the
HDSL loop has dropped below the user defined margin threshold value.
This option is set at the HLU RS-232 front panel maintenance port in
the System Settings menu.
ES LED flashes red to indicate that one HDSL CRC error is detected.
RS-232
(Craft) port
Provides a connection port for a maintenance terminal. The
maintenance terminal allows access to the maintenance, provisioning,
and performance monitoring menus and screens.
Card handle Pull on the card handle to remove the HRU-512 List 1 from the shelf
slot.
Table 1. HRU-512 List 1 Front Panel Components (Cont.)
Name Function

Functional Description 150-512-100-03, Revision 03
8 September 25, 1998 HRU-512 List 1
REAR PANEL FEATURES
The HRU-512 List 1 has two user switch options and a jumper located at the
rear of the unit as shown in Figure 3. Each switch has two settings as
described in Table 3.
Figure 3. HRU-512 List 1 Rear Panel
I-CPE 0
60
TLOS-LB DIS
EN
RLEV 0
-15
Manual Switches
SCURR (JP2)

150-512-100-03, Revision 03 Functional Description
HRU-512 List 1 September 25, 1998 9
Table 2. Rear Panel Components
Switch Setting Function
I-CPE 0Sets the CPE current to 0 mA.
60 Sets the CPE current to 60 mA to power an external NID.
TLOS-LB DIS Does not allow the HRU-512 List 1 to enter its logic loopback state
when a loss of the T1 XMT signal from the CPE causes the HLU to
transmit the AIS signal toward the DSX-1.
EN Allows the HRU-512 List 1 to enter its logic loopback state when a
loss of the T1 XMT signal from the CPE causes the HLU to transmit
the AIS signal toward the DSX-1. While in this loopback state, the
HRU-512 List 1 transmits the AIS signal toward the CPE and
returns the network signal back to the network. The HLU displays
TLOS in its front panel display. This condition remains until a valid
T1 signal is received from the CPE or 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 the
HRU-512 List 1 from oscillating into and out of TLOS loopback
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-512 List 1 is used with old line units that do not support this
feature. These older line units (List 6 and under) cannot loopdown
an HRU-512 List 1 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-512 List 1 toward the NI to 0 dB. Use this
setting when the HRU-512 List 1 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 Configures the T1 RCV level to -15 dB. This sets the T1 output
signal level from the HRU-512 List 1 toward the NI level to -15 dB.
This setting is recommended when the HRU-512 List 1 functions
as a NID.
JP2 Allows the enabling or disabling of the sealing current. To enable,
connect JP2 across both terminals. To disable (default), remove
the jumper from the inner terminal and leave it attached to the
outer terminal only.
The 60 mA option can only be used if the HRU-512 List 1 is
locally powered.

Functional Description 150-512-100-03, Revision 03
10 September 25, 1998 HRU-512 List 1
LOCAL AND LINE POWER
The HRU-512 List 1 can be powered from either the line (over the HDSL
cable pair) or from a local -48 Vdc power supply. It always chooses the local
-48 Vdc power supply if present. It defaults to line power in the absence of
local power. The HLU determines the power state of the HRU before
applying line power. If the HRU is powered up, the HLU does not turn on the
line power. If the HRU is not powered up, the HLU turns on the line power.
When locally powered, the HRU-512 List 1 provides 14 mA (long loop) to
16 mA (short loop) of metallic sealing current towards the HLU, when the
HRU-512 List 1 is locally powered. Jumper JP2, located on the
HRU-512 List 1 (shown in Figure 3), and switch SW5 located on the HLU,
may be configured by the user to either enable or disable the metallic sealing
current capability.
To enable the sealing current capability when the HRU-512 is locally
powered, the following two steps must be performed:
1At the HLU, set switch SW5 to the LOCAL position.
2At the HRU-512 List 1, connect JP2 across both terminals.
Sealing current from the HRU-512 will only be provided if JP2 is jumpered
across both terminals when the HRU-512 List 1 is locally powered.
To configure the system for the HLU line powering:
1At the HLU, set switch SW5 to the LINE position.
2At the HRU-512 List 1, connect JP2across just one of the two terminals.
These are the factory defaults for both units.

150-512-100-03, Revision 03 Installation
HRU-512 List 1 September 25, 1998 11
INSTALLATION
This section describes how to install the HRU-512 List 1.
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 in transit, immediately report the
extent of damage to the transportation company and to PairGain.
2Verify the contents using the packing list.
If you must store the equipment for a prolonged period, store it in the
original container.
INSTALL THE HRU-512 LIST 1
The HRU-512 List 1 mounts in the following Remote Indoor Enclosures
shelves
•PairGain’s HRE-421 (double width, single slot)
•HRE-422 (single width, two slots)
•HRE-420 (single width, single slot)
•HRE-427 (single width, seven slots, wall or rack mount)
For outdoor applications, the HRU-512 List 1 mounts in the following:
•HRE-423 (double width, under or above ground, three slots)
•HRE-450 (single width, above ground, single unit)
•The HRU is also compatible with industry standard 400-type mechanics
shelves
•HRE-456 (single width, under or above ground, four slots).

Installation 150-512-100-03, Revision 03
12 September 25, 1998 HRU-512 List 1
To install the HRU-512 List 1:
1Ensure that the shelf is correctly mounted and wired (refer to the shelf’s
technical practice for additional information).
2Slide the HRU-512 List 1 into the card guides for the desired slot, then
push the unit back until it touches the backplane cared-edge connectors.
3Place your thumbs on the HRU-512 List 1 front panel and push the
HRU-512 List 1 into the card-edge connector until it is secured in the
card guides.

150-512-100-03, Revision 03 Installation
HRU-512 List 1 September 25, 1998 13
The HRUs edge connector pinouts are shown in Figure 4. The active pins are
shown in black.
Figure 4. HRU-512 List 1 Edge Connector Pinouts
55 --- DS1TIP
53
51
49 --- DS1 RING
45
43
41 --- HDSL2 TIP 1
39
37
35
33
31
29
27
25
23
21
19
17
15 --- DS1 RING1
13 --- HDSL RING
11
9
7 ---- HDSLTIP
56
CHASSIS GND*
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
5 ---- DS1TIP1
3
1
6
4
2
RS-232 DATA OUT
FOR FACTORY
TESTING
RCV
XMT
RS-232 DATA IN
* Chassis GND may be tied to Earth GND per local practice
48 VOLT
LOCAL POWER
+
_

Installation 150-512-100-03, Revision 03
14 September 25, 1998 HRU-512 List 1
INSTALLATION TEST
Perform the following procedure to test the HRU-512 List 1.
1Press the loopback button (see Figure 2 for the location of this button for
at least five seconds.
Verify that the LB NET LED lights green, indicating that the
HRU-512List 1 is in a digital (NREM) loopbackstate. If possible, verify
that the HLU front panel displays NREM.
2Have the CO transmit a T1 test signal to the HLU.
Measure the return (loop) signal to verify it is error free. If the signal is
not error free, remove the HRU-512 List 1 from loopback by pressing the
loopback button for five seconds. The LB NET LED should be off.
3Have the CO send the HLU 4-in 8 in-band loop-up (NLOC) for five
seconds.
If possible, verify that the HLU front panel displays NLOC.
4Repeat step 2.
If the test passes, the problem is in the cable pair or in the
HRU-512 List 1. 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 port has a 390 k Ωtransmit
to receive resistive signature and that the DS1 ports which have a 15 Ω
transmit to receive resistive signature.
Measure the return (loop) signal to verify it is error free.
6If using anexternal NID, set the I-CPE switch (locatedon the back panel
of the HRU-512 List 1; see Figure 3 on page 8) to 60 mA and verify the
NDI is under power. Check that the voltage across the front panel test
points (60 mA MON) measure between 55 mV and 65 mV.
7Enable the sealing current option (JP2 connected) if required. Use a
milli-amp meter to verify transmit or receive current in either HDSL pair.