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ETHERPHONE RTNETWORK INTERFACE DEVICE
Model List Number Part Number CLEI Code
EtherPhone RT 1A 150-1515-11 SLML2P0BRA
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
SECTION 500-607-102-02
Revision History of this practice
Revision 01—November 7, 1997
Revision 02—December 17, 1997
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December 17, 1997 Section 500-607-102-02
ii EtherPhone RT List 1A
Information contained in this 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.
PairGain is a registered trademark, and EtherPhone and Megabit Modem are trademarks of PairGain Technologies, Inc.
© Copyright 1997 PairGain Technologies, Inc.
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Section 500-607-102-02 December 17, 1997
EtherPhone RT List 1A iii
TABLE OF CONTENTS
PRODUCT OVERVIEW ............. ............. ............. ............. ............. ............. ............. ............ ............. . 1
Description and Features........................................................................................................ 1
Specifications ........................................................................................................................ 3
FUNCTIONAL OVERVIEW............................................................................................................... 5
Application............................................................................................................................ 5
COMPATIBILITY............................................................................................................................... 8
INSTALLING THE ETHERPHONE RT ........................................................................................... 9
Required Tools and Test Equipment ...................................................................................... 9
Installing the EtherPhone RT ................................................................................................. 9
Apply Power ......................................................................................................................... 16
TESTING THE ETHERPHONE RT ................................................................................................. 16
Testing.................................................................................................................................. 16
Using Alarms........................................................................................................................ 16
SYSTEM ADMINISTRATION .......................................................................................................... 16
System Administration..........................................................................................................16
Fault Isolation....................................................................................................................... 17
TECHNICAL SUPPORT.................................................................................................................... 17
CERTIFICATION AND WARRANTY.............................................................................................. 17
Certification.......................................................................................................................... 17
Warranty............................................................................................................................... 18
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December 17, 1997 Section 500-607-102-02
iv EtherPhone RT List 1A
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 damage to equipment or the possibility of
personal injury.
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PRODUCT OVERVIEW
Description and Features
This line powered device is designed to operate from S-HDSL line power, which can
be approximately 260 VDC when no load is applied and 210 VDC under full load.These voltage levels represent a serious shock hazard. Use caution when installing
this device, and ensure that the line power from the Central Office or the device's
local power is turned off before handling the S-HDSL line.
The PairGain® EtherPhonec RT (Remote Terminal) Network Interface Device (NID) is the subscriber side
of a Single-pair High-bit-rate Digital Subscriber Line (S-HDSL) transmission system. It is an outdoor
enclosure that connects to an EPH-220 to support a Plain Old Telephone Service (POTS) channel and a data
channel. When used with an EPH-220, the system provides 768 kbps full-duplex transmission on one
unconditioned copper pair over the full Carrier Serving Area (CSA) range. The CSA includes loops up to
12,000 feet of 24 AWG wire or 9,000 feet of 26 AWG wire, including bridged taps.
The EtherPhone system combines the EtherPhone RT Network Interface Device with an EPH-220 line unit to
provide a cost-effective, easy-to-deploy method of delivering high speed LAN and voice extension services
over a single copper pair. The symmetric S-HDSL technology makes this system ideal for LAN and PBX
extensions for the small office/home office environment as well as for telecommuting.
The EtherPhone RT List 1A (part number 150-1515-11) is a line powered unit. It receives its power via the
S-HDSL.
The EtherPhone RT provides two independent access doors.
• Subscriber access door: Allows access only to the subscriber POTS and 10BASE-T Ethernet. See
Figure 1.
• Tel. Co. Access door: Allows access to all internal components. See Figure 2.
Figure 1. External View of the EtherPhone RT Housing and the Subscriber Access Door
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Figure 2. External View of the EtherPhone RT Housing and the Tel. Co. Access Door
Figure 3 shows an internal view of the EtherPhone RT with the Tel. Co. Access door opened.
Figure 3. Internal View of EtherPhone RT
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The EtherPhone RT provides:
• transparent MAC-layer Ethernet bridge that is managed by Simple Network Management Protocol
(SNMP) when used as a bridge
• static IP mapping for eavesdropping protection and broadcast filtering when used as a router
• two-wire loop-start current-feed POTS interface
• S-HDSL interface
Specifications
Hardware
Height.........................................................12 inches
Width..........................................................10 inches
Depth ..........................................................4 1/2 inches
Weight ........................................................3 1/8 pounds
Interface Connection
Telephone ................................ ...................One POTS (RJ-11 and Terminal Block) port
Ethernet LAN..............................................One 10BASE-T (RJ-45 and Terminal Block) port
Line ............................................................One S-HDSL port
Pinouts:
Pin Signal
1 NC
2 Tx+
3 Tx-4 Rx+
5 Rx-
6 NC
Electrical Protection
Primary surge protection and power cross protection on S-HDSL
S-HDSL
Signal Format..............................................Full-duplex 704 kbps data, plus 64 kbps voice channel (one pair)
Line Code ................................... ................2B1Q (two bits, one quaternary)
Transmit Signal Power ................................ +13.5 dBm
Return Loss.................................................20 dB at 40 kHz to 200 kHz
Loop Provisioning Loss...............................35 dB at 196 kHz at 135 Ω
One-way Transmission Delay......................<250µs
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Telephone
Line ......................... .......................... ......... 2-wire analog loop-start current feed
Ringer Output............................................. 3 REN
Analog Impedance...................................... 600 Ω
Max Subscriber Loop............................. ..... 70 Ω
Bridging
Encapsulation ................. ................... ......... Low-overhead HDLC or PPP
Bridging ..................................................... IEEE 802.1d transparent MAC-layer with Spanning Tree Protocol
Address Learning........................................ 2000 MAC addresses with aging
Full bandwidth filtering .............................. 14 kpps (64-byte packets both directions)
Forwarding ................................... .............. 1523 pps each direction (64 byte packets both directions)
Dynamic buffering....... ............................... 60 maximum size packets
Routing
Encapsulation ................. ................... ......... Low-overhead HDLC or PPP
Address Learning........................................ 2000 MAC addresses with aging
Full bandwidth filtering .............................. 14 kpps (64-byte packets both directions)
Forwarding ................................... .............. 2.7 kpps (64 byte packets both directions)
Dynamic buffering....... ............................... 60 maximum size packets
Static IP Mapping for eavesdropping protection and secure equal access
Management and Maintenance
Embedded SNMP Agent
BOOTP/TFTP download (with RFC 1542 extensions)
RFC 1533 Dynamic Host Configuration Protocol
RFC 1213 MIB II, RFC 1493 Bridge MIB (base, ST, transparent groups)
PairGain HDSL MIB extensions
RFC 1215 Traps (link state) and ST Traps (newRoot, topology Changed)
Maximum Power Consumption
Line Power On............................................ 8.50 W
Maximum Heat Dissipation for 3 REN Load
On Hook..................................................... 6.83 W
Off Hook .................................................... 7.72 W
Ringing.......................................................8.51 W
Environment
Weatherproof Network Interface Device (NID)
Temperature ............................................... -25°C to 65°C
Humidity .................................................... 90%, condensing
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FUNCTIONAL OVERVIEW
Application
The EtherPhone RT uses a PairGain 2B1Q S-HDSL transceiver system to establish full-duplex 768 kbps data
transmission between the EtherPhone RT and an EPH-220 line unit. This total capacity of 768 kbps isallocated between the 10BASE-T Ethernet port, and the POTS channel. Bandwidth can be allocated to the
Ethernet port in multiples of 56 kbps or 64 kbps, up to a maximum of 12 x 64 kbps (768 kbps). When Life
Line POTS is enabled, one DS0 channel (64 kbps) is allocated to the POTS line, and up to 11 of the
remaining DS0 channels can be allocated to the Ethernet port.
S-HDSL Transceiver. The EtherPhone RT is connected to a Central Office (CO) via a 784 kpps S-HDSL
link. The bit stream contains S-HDSL frames that are nominally 4704 bits (6 milliseconds) in length. The
S-HDSL frames contain a 14 bit Frame Sync Word (FSW), 6 bit Cyclic Redundancy Check (CRC), 21 bit
operations channel, and a fractional DS1 payload with 48 frames each containing 12 DS0 channels and a
framing bit. The frame bits carry the D4 superframe pattern which is used to synchronize the robbed bit
signalling in the POTS channel. These frames are passed to the S-HDSL transceiver which converts them to
the 2B1Q format of the S-HDSL. The S-HDSL operates in a full-duplex mode on a single copper pair. The
transceiver incorporates echo cancellation and adaptive equalization to communicate in the presence of
impairments and noise on the single copper pair.
General guidelines require that the copper loop has less than 35 dB of loss at 196 kHz, with 135 ohms driving
and terminating impedances. The EPH-220 operates with any number of other T1, POTS, Digital Data
Service (DDS), or S-HDSL systems sharing the same cable binder group.
Table 1 provides a guide for the signal loss of various cable gauges at 196 kHz and 135 ohms. Without
specific insertion loss measurement data, add 3 dB for each bridged tap and 1 dB for each cable gauge
change.
Table 1. S-HDSL Loss Over Cables
Cable
Gauge
Loss at 196 kHz
(dB/kft)
ohms per kft
26/0.4mm 3.88 83
24/0.51mm 2.84 52
22/0.61mm 2.18 32
19/0.91mm 1.54 16
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Figure 4 illustrates the maximum loop lengths for an EPH-220 transmission to achieve a 6 dB noise margin
(with a 35 dB cable loss) under CSA guidelines. Use thicker gauge wire to achieve greater distances.
Figure 4. S-HDSL Distance Chart
When the POTS line is enabled, the EtherPhone RT receives encoded and decoded voice and signaling into
the first time slot (64 kbps DS0) of the FT1 frame. The voice and signaling information are recovered at the
EtherPhone line unit, and restored to analog format for direct connection to a CO voice switch. The
remaining 11 DS0 time slots are available for allocation to the customer’s 10BASE-T Ethernet interface. To
provide for flexible provisioning, the EtherPhone RT can receive from 0 to 11 time slots to the 10BASE-T
Ethernet interface, and the channels can be configured to operate at 64 kbps or 56 kbps. When the POTS line
is disabled, all 12 time slots can be allocated to the 10BASE-T Ethernet interface. As an example, if POTS is
enabled, and six time slots are allocated to the 10BASE-T interface, and the DS0 channels are configured to
operate at 56 kbps, then the user is provided a single phone line and an independent 10BASE-T Ethernet
interface with a full-duplex data transmission limit of 336 kbps (6 x 56 kbps). In this example, seven DS0
time slots of the FT1 frame are used to transport the customer information and the remaining five DS0 time
slots are idle.
Refer to the EPH-220 technical practice for information on how to enable the POTS line and how to set theDS0 time slots through the EPH-220 Console menus.
EtherPhone RT Powering. The EtherPhone RT is line powered from the CO. It is designed to operate
with a nominal voltage of 200 V dc. The EtherPhone RT consumes approximately 8.5 Watts when ringing
into a 3-REN load.
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LEDs. The EtherPhone RT has four LEDs (see Figure 3) that operate as described in Table 2.
Table 2. Reading the EtherPhone RT Front Panel Status LEDs
LED Mode Color Status
LINK Off
On Green
EtherPhone RT is not powered on, customer's PC is not
powered on, or 10BASE-T cable is not correctly wired.
10BASE-T Ethernet interface on the EtherPhone RT is
correctly wired, and the customer’s Ethernet equipment is
active.
LPBK Off
On
Flashing
Amber
Amber
Normal operation.
Indicates out-of-service test conditions.
Flashes in unison with the ALARM LED during power-up
self test, if supported. Otherwise indicates out-of-service
test conditions.
SYNC Off
On Green
HDSL subscriber loop not in sync.
HDSL subscriber loop in sync, and no minor alarms haveoccurred.
ALARM Off No alarm condition exists.
Flashing Red Flashes in unison with the LPBK LED during power-up self
test, if supported. Otherwise indicates a major alarm (loss
of S-HDSL) condition exists. When the S-HDSL is down,
this LED is flashing, and the SYNC LED is OFF.
On Red Subscriber loop is in sync, but a minor alarm condition
exists. Minor alarm conditions can exist for several
reasons, and should be managed from the EPH-220
line unit. A minor alarm indication does not necessarily
indicate a service-affecting condition.
Security Hasp. The security hasp prevents unauthorized access to the telephone and data interfaces. The
Tel. Co. Access door prevents accidental customer contact with the internal electronics and the S-HDSL.
The customer can secure the EtherPhone RT Subscriber access door by putting a padlock through the security
hasp. A tamper-proof screw overrides the padlock allowing access by telephone company. personnel via the
Tel. Co. Access door.
Environmental Hardening. The EtherPhone RT enclosure is a standard network interface device, and is
hardened to withstand environmental conditions, including temperature, humidity, salt fog, water spray, UV,
and insecticide.
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Electrical Protection. The EtherPhone RT is designed to mount on the side of residences, in attics, or in
closets. The S-HDSL interface is usually strung outdoors and is exposed to potential lightning strikes, while
the POTS drop and 10BASE-T Ethernet cable are not. It is assumed the customer interfaces will be wired
directly into a residence or structure. The S-HDSL line has power cross protection, primary surge protection,
and secondary surge protection; the customer interfaces have only secondary surge protection. Primary surge
protection is provided by an insulation displacement that terminates the S-HDSL port. It contains an internal
three element gas-filled surge arrester which provides primary surge protection across the line. The gas tube
conforms to the following specifications:
• PE 80, heavy duty
• Bellcore TR-TSY-000073
• GTS 8376
The primary protector performs insulation displacement termination. It accepts one unstripped drop-wire pair
of either of the following wire types:
• 0.96 square mm (18 to 19 AWG) copper and steel wire with 4.572 mm (0.180") maximum outer diameter
insulation
• 0.25 to 0.48 mm (22 to 24 AWG) solid copper conductor with 0.762 mm (0.030") maximum outer
diameter insulation
Safety. The EtherPhone RT provides a Tel. Co. Access door to prevent accidental customer contact withinternal electronics and the S-HDSL line. The door is secured with a tamper-proof screw.
Corrosion Resistant. All underground connections are protected from corrosive forces by conformal
coating, insulation displacement connectors, or isolated screw terminals.
COMPATIBILITY
The EtherPhone RT is compatible with the following PairGain products, making it useful in many application
situations.
• EtherPhone 220 line unit with 10BASE-T and POTS termination, part number 150-1520-02
• Megabit Modem 220 line unit with 10BASE-T termination, part number 150-1521-01 or 150-1521-02
• DSX-1 terminated Fractional T1 line unit (FT1-220), part number 150-1522-01
The EtherPhone RT is not compatible with doublers.
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INSTALLING THE ETHERPHONE RT
Required Tools and Test Equipment
Tools required:
• insulated-handle wire stripper
• insulated-handle needlenose pliers
• adjustable wrench
• 3/8 inch hex-nut driver
• no. 2 standard screwdriver
• knife
Installing the EtherPhone RT
Safety Precautions. To ensure the safety of personnel and equipment, carefully observe the followingsafety rules:
Be careful when installing or modifying telephone lines. Dangerous voltages can
be present. It is unsafe to install telephone wiring during a lightning storm.
Always disconnect all telephone lines and power connections before servicing or
disassembling this equipment.
All wiring external to the product should follow the local wiring codes.
As a means of disabling line power from the line unit during installation of the EtherPhone RT, it is advisable
to short the S-HDSL Tip and Ring conductors together. This ensures that the potential difference between
Tip and Ring is zero.
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Attach the EtherPhone RT Housing
For compliance with UL safety requirements, the EtherPhone RT must be
installed a minimum of three feet above ground level.
1 Install the two #10 x 1-1/2 inch wood screws and flat washers provided in the EtherPhone RT Mounting
Kit through the mounting holes to attach the EtherPhone RT to the customer residence (Figure 5). For
installation on stucco or other suitable surfaces, use the two PairGain provided #10 x 1-1/2 inch anchor
nuts.
Install the EtherPhone RT housing only as shown in Figure 5, with the three
access openings facing down. Otherwise, possibly damaging materials (such
as fluids) can enter the EtherPhone RT housing.
Figure 5. Attaching the EtherPhone RT Housing to the Mounting Surface
2 Open the Tel. Co. Access door using the 3/8 inch hex driver.
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3 Refer to the EtherPhone RT Wiring label (affixed to the inside cover of the EtherPhone RT) during
installation (Figure 6). The wiring label depicts the signal names and relative locations for all external
electrical connections.
Figure 6. EtherPhone RT Wiring Label
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Connect the S-HDSL
1 Split the ends of the S-HDSL drop wire leads approximately 2 inches.
2 Strip the wires using an insulated handle wire stripper.
3 Use a knife to cut the rubber S-HDSL entry grommet along the scored lines (see Figure 7 for the location
of the entry grommet).
Figure 7. S-HDSL Entry Grommet
4 Use the adjustable wrench to loosen the top nut on each post of the Primary Protection Module. Do not
loosen the lower nuts which could cause the wires running from the Primary Protection Module to the
circuit board to disconnect.
5 Route the S-HDSL wire through the S-HDSL entry grommet.
6 Place the Tip wire clockwise (CW) around the right-side Primary Protection Module post, with one
washer below the wire and two washers above. Tighten the top nut. See Figure 8.
7 Place the Ring wire CW around the left-side Primary Protection Module post, with one washer below the
wire and two washers above. Tighten the top nut. See Figure 8.
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Figure 8. Attaching the Tip and Ring Wires
Connect the Frame Ground Wire
1 Loosen the Ground lug screw. See Figure 8.
2 Insert an up to 6 AWG solid wire through the S-HDSL entry grommet
3 Position the wire into the Ground Lug and tighten the screw.
4 Attach the other end of the wire to an approved Earth ground per local practice.
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Attach the Subscriber Analog POTS Drop
Install the POTS wiring to the 2-wire POTS Drop Connector Module.
1 Use a knife to cut the rubber POTS drop grommet along the scored lines for wire access.
2 Turn CCW the red (Ring) and green (Tip) screws on the POTS Drop Connector Module (see Figure 9).
3 Strip approximately 1/2 inch of insulation from the POTS wiring, if necessary.
4 Insert the POTS wire pair through the POTS drop grommet.
5 Place the Ring-side POTS wire between the washers (two on top and two on the bottom) under the red
screw head, then tighten.
6 Place the Tip-side POTS wire between the washers (two on top and two on the bottom) under the green
screw head, then tighten.
Figure 9. POTS Installation
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Attach the Subscriber 10BASE-T Ethernet Drop
Install the Ethernet wiring to the 4-wire 10BASE-T Ethernet Connector Module:
To avoid electrical shock, handle the stripped cable by its insulation with
the insulated-handle needlenose pliers.
1 Use a knife to cut the rubber 10BASE-T drop grommet along the scored lines for wire access.
2 Turn CCW the red, green, yellow, and black screws on the 10BASE-T Ethernet Connector Module (see
Figure 10).
3 Strip approximately 1/2 inch of insulation from the Ethernet wiring, if necessary.
4 Insert the Ethernet wiring through the drop grommet.
5 Place each colored wire between the washers ( two on top and two on the bottom) under the screw head
of the same color, or use the chart below to match the signal of each terminal lug to each wire. (Do not
connect the Ethernet wires to the two-wire POTS Drop Connector Module). The signals are not
reversible, and pair separation must be maintained.
10BASE-T Terminal Lug Signal
Yellow RCV -
Black RCV +
Green XMT +
Red XMT -
6 Tighten each terminal lug.
Figure 10. 10BASE-T Installation
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Close the Housing
Close and fasten the Tel. Co. Access door.
Apply Power
The EtherPhone RT is powered by the S-HDSL line. Ensure that the associated line unit is turned-up andconfigured for Hi power (refer to the Technical Practice for your line unit). If a short was applied across the
Tip and Ring conductors on the S-HDSL pair, remove the short. The EtherPhone RT should power-up within
approximately 30 seconds.
When power is applied, the ALARM and LPBK LEDs flash as the unit goes through self-test. After self-test,
the ALARM LED continues to flash indicating that the unit is powered-up and the S-HDSL line is not yet
synchronized. When synchronization is achieved, the ALARM LED goes out, and the SYNC LED lights.
The LINK LED is lit only if the customer’s Ethernet equipment (such as a PC) is turned on and correctly
wired to the EtherPhone RT. Alternatively, a hand-held Ethernet tester can be used. Simply plug the
Ethernet tester into the customer’s 10BASE-T connection, and verify that the link is established with the
EtherPhone RT.
TESTING THE ETHERPHONE RT
Testing
The RJ type connectors can be removed from the Connector Modules to test the Ethernet and the POTS lines.
• Follow standard POTS procedures to check the overall performance of the POTS channel coming in and
out, including ringing, dialing, and transmission. Use the customer's telephone if possible.
• Follow standard Ethernet procedures to check the overall performance of the Ethernet line coming in and
out.
Using Alarms
Alarms are configured and managed from the associated line unit. Refer to the appropriate line unit
documentation.
SYSTEM ADMINISTRATION
System Administration
The EtherPhone RT is configured using the EPH-220 Console menus as described in the EPH-220 Technical
Practice, PairGain Section Number 500-605-150, Revision 02. You can enable or disable the EtherPhone RT
POTS line or set the DS0 time slots by simply logging into the EPH-220 connected to the EtherPhone RT. To
change any other EtherPhone RT system settings, you must first complete a remote logon (see "Remote
Logon" in the EPH-220 technical practice).
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Fault Isolation
If the EtherPhone RT indicates a major alarm during the first minute of turn up, or if it fails to indicate power
on, perform the following diagnostic and repair operations:
• Verify that the line unit and EtherPhone RT are installed on the same pair.
• Verify that the line unit is installed and turned up.
• Verify that the signal loss on the pair is no more than 35 dB at 196 kHz.
• Check for S-HDSL cable fault, and replace if necessary.
• Replace the EtherPhone RT.
• Replace the line unit.
TECHNICAL SUPPORT
PairGain Technical Assistance is available 24 hours a day, 7 days a week by contacting PairGain Customer
Service Engineering group at:
Telephone: (800) 638-0031 or (714) 832-9922
Fax: (714) 832-9924
During normal business hours (8:00 AM to 5:00 PM, Pacific Time, Monday - Friday, excluding holidays),
technical assistance calls are usually answered directly by a Customer Service Engineer. At other times, a
request for technical assistance is handled by an on-duty Customer Service Engineer through a callback
process. This process normally results in a callback within 30 minutes of initiating the request.
In addition, PairGain maintains a computer bulletin board system which can be used to obtain current
information on PairGain products, product troubleshooting tips and aids, accessing helpful utilities, and to
post requests or questions. This system is available 24 hours a day by calling (714) 730-3299. Transmission
speeds up to 28.8 kbps are supported with a character format of 8-N-1.
CERTIFICATION AND WARRANTY
Certification
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with this instruction
manual, may cause harmful interference to radio communication.
There is no guarantee that interference will not occur in a particular installation. If this equipment does causeharmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
The EtherPhone RT is UL/CSA approved.
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Any changes or modifications not expressly approved by the grantee of this
device voids the user’s authority to operate the equipment.
Warranty
PairGain Technologies warrants this product to be free of defects and to be fully functional for a period of 60
months from the date of original shipment, given proper customer installation and regular maintenance.
PairGain will repair or replace any unit without cost during this period if the unit is found to be defective for
any reason other than abuse or improper use or installation.
Do not try to repair the unit. If it fails, replace it with another unit and return the faulty unit to PairGain for
repair. Any modifications of the unit by anyone other than an authorized PairGain representative voids the
warranty.
If a unit needs repair:
1 Call PairGain for a Return Material Authorization (RMA) number at (800) 370-9670.
2 Return the defective unit, freight prepaid, along with a brief description of the problem, to:
PairGain Technologies, Inc.
14352 Franklin Avenue
Tustin, CA 92780-7013
ATTN: Repair and Return Dept.
Telephone: (714) 730-2800
FAX: (714) 730-2961
PairGain continues to repair faulty modules beyond the warranty program at a nominal charge. Contact your
PairGain sales representative for details and pricing.
7/29/2019 Ethernet Phone RT
http://slidepdf.com/reader/full/ethernet-phone-rt 23/24
7/29/2019 Ethernet Phone RT
http://slidepdf.com/reader/full/ethernet-phone-rt 24/24
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