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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



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.



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




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.




EtherPhone RT List 1A Page 1

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




Page 2 EtherPhone RT List 1A

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





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





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





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





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.





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.





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.





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.





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.





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





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.





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.





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





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





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).





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.





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.

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