Patton electronic 2701-I User Manual

USER MANUAL

MODEL 2701/I

G.703/G.704 NTU with 10Base-T Ethernet Interface

Important—This is a Class A device and is

intended for use in a light industrial environment. It is not intended nor approved for use in an industrial or residential environment.

Part# 07M2701I-UM

Doc# 08609U2-001

Rev. I

Revised 2/18/08

An ISO-9001Certiﬁed

Company

SALES OFFICE (301) 975-1000 TECHNICAL SUPPORT (301) 975-1007

CONTENTS

1.0 Warranty & Compliance Information ........................................ 4

1.1 Compliance................................................................................... 4

EMC Compliance.......................................................................... 4

Safety Compliance: ...................................................................... 4

PSTN Regulatory Compliance:..................................................... 4

1.2 CE Notice...................................................................................... 5

1.3 Authorized European Representative........................................... 5

1.4 Service.......................................................................................... 5

1.5 Safety When Working With Electricity .......................................... 6

2.0 General Information.................................................................... 7

2.1 Features........................................................................................ 7

2.2 Description.................................................................................... 7

3.0 PPP Operational Background.................................................... 9

3.1 Applications .................................................................................. 9

4.0 Configuration ............................................................................ 11

4.1 DIP Switch Configuration............................................................ 11

Switch SW1 ................................................................................ 12

Switch SW-1 through SW1-5 ............................................... 12

SW1-6 and SW1-7 Clock Modes ......................................... 13

Switch SW2 ................................................................................ 14

Switch SW2-1 Line Coding: HDB3 (default) ........................ 14

Switch SW2-2: CRC-4 Multiframe ....................................... 15

Switch SW2-3 Data Inversion .............................................. 15

Switch SW2-4: Remote Digital Loopback Type ................... 15

Switch SW2-5 Front Panel Switches ................................... 16

Switch SW2-6: V.54 Response Disabled (default) .............. 16

5.0 Installation................................................................................. 17

5.1 Connecting to the G.703 Network............................................... 17

Connecting Dual Coaxial Cable (75 ohm) to the G.703 Network 17

Opening the Case....................................................................... 18

Connecting the Twisted Pair (120 ohm) to the G.703 Network .. 18

5.2 Connecting the 10Base-T Ethernet Port to a PC (DTE) ............. 19

5.3 Connecting the 10Base-T Ethernet Port to a Hub ...................... 19

5.4 Power Connection ...................................................................... 20

Universal AC Power (100–240 VAC).......................................... 20

DC Power ................................................................................... 20

6.0 Operation................................................................................... 21

6.1 Power-up .................................................................................... 21

6.2 LED Status Monitors................................................................... 21

6.3 Loop (V.54 & Telco) Diagnostics ................................................ 23

Operating Local Loopback (LL) .................................................. 23

Operating Remote Digital Loopback (RL)................................... 24

CSU Loop ................................................................................... 24

Using the V.52 (BER) Test Pattern Generator ........................... 25

2

A

Specifications ........................................................................... 26

A.1 Network Data Rate ...................................................................... 26

A.2 Network Connector ..................................................................... 26

A.3 Nominal Impedance ................................................................... 26

A.4 Line Coding ................................................................................ 26

A.5 Line Framing ............................................................................... 26

A.6 CRC-4 Multiframing .................................................................... 26

A.7 Clocking ...................................................................................... 26

A.8 Time Slot Rate ............................................................................. 26

A.9 Network Data Rates .................................................................... 26

A.10 Distance ...................................................................................... 26

A.11 Power Supply .............................................................................. 26

A.12 Humidity ...................................................................................... 27

A.13 Temperature ............................................................................... 27

A.14 Dimensions ................................................................................. 27

B

Ethernet 10Base-T Specifications........................................... 28

B.1 DTE Interface .............................................................................. 28

B.2 DTE Data Rates .......................................................................... 28

B.3 LAn Connection .......................................................................... 28

B.4 Protocol ....................................................................................... 28

B.5 MAC Address Table Size ............................................................ 28

B.6 MAC Address Aging ................................................................... 28

B.7 Frame Buffer ............................................................................... 28

B.8 Frame Latency ............................................................................ 28

B.9 Diagnostics ................................................................................. 28

B.10 Indicators .................................................................................... 28

B.11 Configuration .............................................................................. 28

C

Factory Replacement Parts and Accessories........................ 29

3

1.0 WARRANTY & COMPLIANCE INFORMATION

Patton Electronics warrants all Model 2701/I components to be free from defects, and will—at our option—repair or replace the product should it fail within one year from the ﬁrst date of shipment.

This warranty is limited to defects in workmanship or materials, and does not cover customer damage, abuse, or unauthorized modiﬁcation. If this product fails or does not perform as warranted, your sole recourse shall be repair or replacement as described above. Under no condition shall Patton Electronics be liable for any damages incurred by the use of this product. These damages include, but are not limited to, the following: lost proﬁts, lost savings and incidental or consequential damages arising from the use of or inability to use this product. Patton Electronics specifically disclaims all other warranties, expressed or implied, and the installation or use of this product shall be deemed an acceptance of these terms by the user.

1.1 COMPLIANCE

EMC Compliance

• EN55022, Class A

• EN55024

Safety Compliance:

• EN 60950-1

• AS/NZS 60950-1

PSTN Regulatory Compliance:

• TBR 12 & 13

• AS/ACIF S016:2001

4

1.2 CE NOTICE

We certify that the apparatus identiﬁed in this document conforms to the requirements of Council Directive 1999/5/EC on the approximation of the laws of the member states relating to Radio and Telecommunication Terminal Equipment and the mutual recognition of their conformity.

The safety advice in the documentation accompanying this product shall be obeyed. The conformity to the above directive is indicated by the CE sign on the device.

1.3 AUTHORIZED EUROPEAN REPRESENTATIVE

D R M Green

European Compliance Services Limited.

Oakdene House, Oak Road

Watchﬁeld, Swindon, Wilts SN6 8TD, UK

1.4 SERVICE

All warranty and nonwarranty repairs must be returned freight prepaid and insured to Patton Electronics. All returns must have a Return Materials Authorization number on the outside of the shipping container. This number may be obtained from Patton Electronics Technical Services at:

• Tel: +1 (301) 975-1007

• Email: support@patton.com

• URL: http://www.patton.com

Note Packages received without an RMA number will not be

accepted.

Patton Electronics' technical staff is also available to answer any questions that might arise concerning the installation or use of your Patton Model 2701/I. Technical Service hours: 8AM to 5PM EST, Monday through Friday.

5

1.5 SAFETY WHEN WORKING WITH ELECTRICITY

• This device contains no user serviceable parts. The equipment shall be returned to Patton Electronics for repairs, or repaired by qualiﬁed service personnel.

• The external power adapter shall be a listed Limited Power Source. Ensure that the power cable used meets all applicable standards for the country in which it is to be installed, and that it is connected to a wall outlet which has earth ground. The mains outlet that is utilized to power the devise shall be within 10 feet (3 meters) of the device, shall be easily accessible, and protected by a circuit breaker.

WARNING

• Hazardous network voltages are present in WAN ports regardless of whether power to the unit is ON or OFF. To avoid electric shock, use caution when near WAN ports. When detaching the cables, detach the end away from the device ﬁrst.

• Do not work on the system or connect or disconnect cables during periods of lightning activity.

WARNING

In accordance with the requirements of council directive 2002/96/EC on Waste of Electrical and Electronic Equipment (WEEE), ensure that at end-of-life you separate this product from other waste and scrap and deliver to the WEEE collection system in your country for recycling.

This device is not intended to be connected to the public telephone network.

6

2.0 GENERAL INFORMATION

Thank you for your purchase of this Patton Electronics product. This product has been thoroughly inspected and tested and is warranted for One Year parts and labor. If any questions or problems arise during installation or use of this product, please do not hesitate to contact Patton Electronics Technical Support at (301) 975-1007.

2.1 FEATURES

• Terminates G.703 and G.704, E1/fractional E1 service

• Available in low-cost standalone or rack-mountable versions

• n x 64 kbps data rates to 2.048 Mbps

• 10Base-T Ethernet bridge

• PPP (Point to Point Protocol, RFC 1661) with Bridge Control Protocol

(RFC 1638)

• 75-ohm dual coax and 120-ohm twisted-pair G.703 connections

• Local and remote loopback diagnostics

• Internal and G.703 network timing

• CE approval

• 90-260VAC & 48VDC power options

• Conforms to ONP requirements CTR 12 and CTR 13 for connection to

international Telecom networks

2.2 DESCRIPTION

The Model 2701/I receives channelized G.704 (n x 64kbps) or clear channel E1/G.703 (2.048-Mbps) data from the telco's digital data network. The Model 2701/I terminates the G.703 telco interface and converts the data for transmission to a user-oriented 10Base-T (802.3) Ethernet interface.

The Ethernet (Model 2701/I) supports an integrated 10Base-T (802.3) Ethernet port with transparent bridging capability for IP, IPX, DECnet, NetBIOS and other layer-3 protocols. The 2701/I attaches to the LAN and intelligently bridges data trafﬁc to the large central site router through the telco's leased line network. The 2701/I supports PPP (RFC

1661) and BCP (RFC 1638).

7

The Model 2701/I is a 10Base-T bridge that operates over G.703/G.704 lines. It uses MAC learning and forwarding to provide seamless LAN-toLAN connectivity. As a result, corporate enterprises can connect their servers to a pair of NTUs and automatically forward data packets that are meant for the remote network. Local packets are ﬁltered and passed only to the local LAN.

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3.0 PPP OPERATIONAL BACKGROUND

PPP is a protocol used for multi-plexed transport over a point-to-point link. PPP operates on all full duplex media, and is a symmetric peer-topeer protocol, which can be broken into three main components: 1. A standard method to encapsulate datagrams over serial links; 2. A Link Control Protocol (LCP) to establish, conﬁgure, and test the data-link connection; 3. A family of Network Control Protocols (NCPs) to establish and conﬁgure different network layer protocols.

In order to establish communications over a point-to-point link, each end of the PPP link must ﬁrst announce its capabilities and agree on the parameters of the link’s operation. This exchange is facilitated through LCP Conﬁgure-Request packets.

Once the link has been established and optional facilities have been negotiated, PPP will attempt to establish a network protocol. PPP will use Network Control Protocol (NCP) to choose and conﬁgure one or more network layer protocols. Once each of the network layer protocols have been conﬁgured, datagrams from the established network layer protocol can be sent over the link. The link will remain conﬁgured for these communications until explicit LCP or NCP packets close the link down, or until some external event occurs.

The PPP Bridging Control Protocol (BCP), deﬁned in RFC 1638, conﬁgures and enables/disables the bridge protocol on both ends of the pointto-point link. BCP uses the same packet exchange mechanism as the Link Control Protocol (LCP). BCP is a Network Control Protocol of PPP, bridge packets may not be exchanged until PPP has reached the network layer protocol phase.

3.1 APPLICATIONS

In situations where a routed network requires connectivity to a remote Ethernet network, the interface on a router can be conﬁgured as a PPP IP Half Bridge. The serial line to the remote bridge functions as a Virtual Ethernet interface, effectively extending the routers serial port connection to the remote network. The bridge device sends bridge packets (BPDU's) to the router's serial interface. The router will receive the layer three address information and will forward these packets based on its IP address.

Figure 1 shows a typical Cisco router with a serial interface conﬁgured as a PPP Half Bridge. The router serial interface uses a remote device that supports PPP bridging to function as a node on the remote Ethernet network. The serial interface on the Cisco will have an IP address on the same Ethernet subnet as the bridge.

9

Figure 1. Cisco router with serial interface, conﬁgured as PPP Half Bridge.

For example, the customer site is assigned the addresses 192.168.1.0/ 24 through 192.168.1.1/24. The address 192.168.1.1/24 is also the default gateway for the remote network. The above settings remove any routing/forwarding intelligence from the CPE. The associated Cisco conﬁguration will set serial interface (s0) to accommodate half bridging for the above example.

Authentication is optional under PPP. In a point-to-point leased-line link, incoming customer facilities are usually ﬁxed in nature, therefore authentication is generally not required. If the foreign device requires authentication via PAP or CHAP, the PPP software will respond with default PeerID consisting of the units Ethernet MAC address and a password which consists of the unit’s Ethernet MAC address.

Some networking systems do not deﬁne network numbers in packets sent out over a network. If a packet does not have a speciﬁc destination network number, a router will assume that the packet is set up for the local segment and will not forward it to any other sub-network. However, in cases where two devices need to communicate over the wide-area, bridging can be used to transport non-routable protocols.

Figure 2 illustrates transparent bridging between two routers over a serial interface (s0). Bridging will occur between the two Ethernet Interfaces on Router A (e0 and e1) and the two Ethernet Interfaces on Router B (e0 and e1).

Figure 2. Transparent bridging between two routers over a serial interface

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4.0 CONFIGURATION

The Model 2701/I features conﬁguration capability via hardware DIP switches. This section describes all possible DIP switch conﬁgurations of the Model 2701/I.

4.1 DIP SWITCH CONFIGURATION

The Model 2701/I has two sets of internal DIP switches that allow conﬁguration for a wide range of applications. The sets of switches are accessed from the underside. Figure 3 shows the location of the DIP switches on the bottom of the printed circuit board.

Figure 3. Underside of Model 2701/I, Showing Location of DIP Switches

The Model 2701/I DIP switches (Switch Sets 1-2) can be conﬁgured as either “ON” or “OFF”. Figure 4 shows the orientation of the DIP switches with respect to ON/OFF positions.

Figure 4. Close up of conﬁguration switches

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Switch SW1

A detailed description of each switch (SW1-1 through SW1-5) setting follows the summary table below:

Switch SW-1 through SW1-5. Use Switches SW1-5 to set the DTE data rate.

SW1 SW2 SW3 SW4 SW5 Speed

On On On On On 64 kbps Off On On On On 128 kbps On Off On On On 192 kbps Off Off On On On 256 kbps On On Off On On 320 kbps Off On Off On On 384 kbps On Off Off On On 448 kbps Off Off Off On On 512 kbps On On On Off On 576 kbps Off On On Off On 640 kbps On Off On Off On 704 kbps Off Off On Off On 768 kbps On On Off Off On 832 kbps Off On Off Off On 896 kbps On Off Off Off On 960 kbps Off Off Off Off On 1024 kbps On On On On Off 1088 kbps Off On On On Off 1152 kbps On Off On On Off 1216 kbps Off Off On On Off 1280 kbps On On Off On Off 1344 kbps

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SW1 SW2 SW3 SW4 SW5 Speed

Off On Off On Off 1408 kbps On Off Off On Off 1472 kbps Off Off Off On Off 1536 kbps On On On Off Off 1600 kbps Off On On Off Off 1664 kbps On Off On Off Off 1728 kbps Off Off On Off Off 1792 kbps On On Off Off Off 1856 kbps Off On Off Off Off 1920 kbps On Off Off Off Off 1984 kbps Off Off Off Off Off Clear Channel 2048 kbps

Note When the data rate is set to 2.048Mb/s, the unit is forced into

G.703 mode, and it transmits user data on all 32 time-lots. There is no framing information; therefore, the CRC4 MF (SW2-2) switch is ignored. In all other rate settings, the unit employs G.704 framing; TS0 is reserved for signaling.

SW1-6 SW1-7 Clock Mode

On On Network (Received Recovered) On Off Internal Off On Internal Off Off Network (Received Recovered)

SW1-6 and SW1-7 Clock Modes.

Network Clock—Transmitter timing is derived using the received line

signal (received recovered) from the network.

Internal Clock—Transmitter timing is derived from an internal clock

source.

13

Switch SW2

A detailed description of each switch (SW1-1 through SW1-5) setting follows the summary table below:

Switch SW2-1 Line Coding: HDB3 (default).

Use Switch SW2-1 to control the Network Line Coding options. Set these options to be the same as the Line Coding given to you by your Service Provider. If you are using two Model 2701/Is together as short range modems, set both units to HDB3.

SW2-1 Line Encoding

Off HDB3 On AMI

Options: HDB3, AMI

HDB3 In this line coding, the transmitter substitutes a deliberate bipo-

lar violation when excessive zeros in the data stream are detected. The receiver recognizes these special violations and decodes them as zeros. This method enables the network to meet minimum pulse density requirements. Unless AMI is required in your application, HDB3 should be used whenever possible.

AMI Alternate Mark Inversion deﬁnes a pulse as a “mark,” a binary

one, as opposed to a zero. In an E1 network connection, signals are transmitted as a sequence of ones and zeros. Ones are sent as pulses, and zeros are sent as spaces, i.e., no pulse. Every other pulse is inverted from the previous pulse in polarity, so that the signal can be effectively transmitted. This means, however, that a long sequence of zeros in the data stream will

14

cause problems, since the NTU receiving the signal relies on the signal to recover the 2.048 Mb/s clock.

If you must use AMI, you should ensure that the data terminal equipment connected to the unit provides a minimally acceptable pulse density. For this reason, there are advantages to using HDB3 instead. AMI coding does not inherently account for ones density. To meet this requirement, the user should ensure that the data inherently meets pulse density requirements.

Switch SW2-2: CRC-4 Multiframe.

In framed mode, SW2-2 is used for CRC-4 MF. When CRC-4 is enabled, the unit monitors the incoming data stream for CRC-4 errors. It transmits CRC-4 error counts to the transmitting unit. When using timeslot zero (TS0), excessive errors may cause loss of frame or loss of sync. If CRC4 MF is used, both units must be set for set for CRC-4 MF. Otherwise, the one using CRC-4 MF will detect loss of sync.

SW2-2 Option

Off CRC-4 Disabled On CRC-4 Enabled

Note When the data rate is set to 2.048Mb/s, then the unit is forced

into G.703 mode, and it transmits user data on all 32 time-lots. There is no framing information; therefore, the CRC4 MF (SW2-

2) switch is ignored. In all other rate settings, the unit employs G.704 framing; TS0 is reserved for signaling.

Switch SW2-3 Data Inversion.

Set Switch S2-3 to determine whether or not the data stream from the local DTE is inverted within the Model 2701 before being passed to the G.703/G.704 network. An inverted data stream may be required when you use the Model 2701 to communicate with a G.703 device (that inverts the data) on the remote end. In typical installations, data inversion is not necessary.

SW2-3 Option

Off Data not inverted On Data inverted

Switch SW2-4: Remote Digital Loopback Type.

The user can set this switch to select the type of remote loop that will be initiated by the Model 2701. If set to V.54, the Model 2701 will initiate a

15

V.54 loop when Remote Loop is selected by the front panel switches. If set to CSU, the Model 2701 will initiate a CSU loop when Remote Loop is selected by the front panel switches.

S2-4 RDL Type

Off Initiate a V.54 RDL loop when selected On Initiate a CSU loopback when selected

Switch SW2-5 Front Panel Switches.

As the Front Panel Switches may be inadvertently toggled, or in the event that the end-user may not need to use the switches, the installer may disable the front panel switches. Set Switch S2-5 to determine whether the front-panel toggle switches are active or inactive.

SW2-5 Option

Off Front Panel Switches Enabled On Front Panel Switches Disabled

Switch SW2-6: V.54 Response Disabled (default).

V.54 Response is a special in-band loopback facility that sends a pseudo-random pattern over the data stream. This is the only loopback that the unit can initiate. This is useful for campus applications when you need to put a remote unit in loopback. The unit responds to the V.54 loopback command, and the whole process takes only a few seconds to complete. When V.54 Loopback is disabled, the unit will not be able to send or respond to V.54 loopback commands. The duration of the loopback is limited by the loopback timeout setting.

SW2-6 Option

Off V.54 Response Enabled On V.54 Response Disabled

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5.0 INSTALLATION

The Interconnecting cables shall be acceptable for external use and shall be rated for the proper application with respect to voltage, current, anticipated tem-

WARNING

perature, ﬂammability, and mechanical serviceability.

Once the Model 2701/I is properly conﬁgured, it is ready to connect to the G.703/G.704 interface, to the Ethernet port, and to the power source. This section describes how to make these connections.

5.1 CONNECTING TO THE G.703 NETWORK

The Power, G.703/G.704 and Ethernet Line connections are located on the rear panel of the Model 2701/I. Figure 5 shows the location of each of these ports.

Figure 5. Model 2701/I Rear Panel

Connecting Dual Coaxial Cable (75 ohm) to the G.703 Network

The Model 2701/I is equipped with dual female BNCs (TX and RX) for connection to a 75 ohm dual coax G.703 network interface. If your G.703/G.704 network terminates via dual coaxial cable, use the diagram below to make the proper connections. See Figure 6 below.

Figure 6. Rear Panel, Showing Location of Connectors.

Note The outer conductor of the coax cables are isolated from system

earth ground.

17

When using the 75 Ohm interface, jumper straps JP2, JP6, and JP7 must be installed over the jumpers. The jumpers are located next to the BNC connectors. Refer to the following section to open the case.

Opening the Case

Open the case by inserting a screwdriver into the slots and twist the screwdriver head slightly. The top half of the case will separate from the lower half of the case. Take caution not to damage any of the PC board mounted components.

Connecting the Twisted Pair (120 ohm) to the G.703 Network

The Model 2701/I is equipped with a single RJ-48C jack for connections to a 120 ohm twisted pair G.703/G.704 network interface. If your G.703/ G.704 network terminates via RJ-48C, use the connection diagram (Figure 7) following the pinout and signals chart below to connect the 120 ohm G.703/G.704 network channel.

Signal NameRJ-48C Jack

1

1 2 3 4 5 6 7 8

Figure 7. G.703/G.704 170 ohm Connection.

(RX) Receive (Ring)

2

(RX) Receive (Tip)

3

Shield

4

(TX) Transmit (Ring)

5

(TX) Transmit (Tip)

6

Shield

7

No connection

8

No connection

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5.2 CONNECTING THE 10BASE-T ETHERNET PORT TO A PC

(DTE)

Figure 8. Connecting the 10Base-T Ethernet Port to a PC

The 10Base-T interface is conﬁgured as DTE (Data Terminal Equipment). If the Model 2701/I is to to connect to another DTE device such as a 10Base-T network interface card, construct a 10Base-T crossover cable and connect the wires as shown in the diagram below (Figure 9).

Figure 9. 10Base-T Cross-over Cable Connection

5.3 CONNECTING THE 10BASE-T ETHERNET PORT TO A HUB

The 10Base-T interface is conﬁgured as DTE (Data Terminal Equipment), just like a 10Base-T network interface card in a PC. Therefore, it “expects” to connect to a 10Base-T Hub using a straight-through RJ-45 cable. Use the diagram below (Figure 10) to construct a cable to connect the 10 BaseT interface to a 10Base-T Hub.

Figure 10. Connecting the 10Base-T Ethernet Port to a Hub

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5.4 POWER CONNECTION

Universal AC Power (100–240 VAC)

The Model 2701/I uses a 5VDC, 2A universal input 100-240VAC, power supply (center pin is +5V). The universal input power supply has a male IEC-320 power entry connector. This power supply connects to the Model 2701/I by means of a barrel jack on the rear panel. Many international power cords are available for the universal power supply.

The Model 2701/I powers up as soon as it is plugged into an AC outlet-there is no power switch..

DC Power

The 36-60 VDC DC to DC adapter is supplied with the DC version of the Model 2701/I. The black and red leads plug into a DC source (nominal 48VDC) and the barrel power connector plugs into the barrel power supply jack on the 2701/I. (See Figure 11).

To Power

Supply Jack

S/N: G01234567890

MADE IN CHINA BY SUNNY

Barrel power connector

Figure 11. Connecting DC Power to the 2701 DC Power Supply.

SWITCHING POWER SUPPLY

MODEL : SYD1106-0505

INPUT : 36-60V 0.2A MAX

OUTPUT : +5V 1.0A

OUTPUT POWER : 5W MAX

There are no user-serviceable parts in the power supply section of the Model 2701. Contact Patton Electronics Technical support at

WARNING

(301)975-1007, via our web site at http:// www.patton.com, or by e-mail at support@patton.com, for more information.

-Vin

+Vin

To -48VDC

Source

Black lead (-V)

Red lead (+V)

20

6.0 OPERATION

When the Model 2701/I has been properly conﬁgured and installed, it should operate transparently. This sections describes power-up, LED status monitors, and the built-in loopback test modes.

6.1 POWER-UP

Before applying power to the Model 2701/I, please read section 5.4, “Power Connection” on page 20 and ensure that the unit is properly connected to the appropriate power source..

6.2 LED STATUS MONITORS

The Model 2701/I features six front panel LEDs that monitor connections on the G.703/G.704 and 10BaseT links, signaling, error and test modes. Figure 10 (below) shows the front panel location of each LED. Descriptions of each LED follow Figure 12.

E1 Link

Figure 12. 2701/I Front Panels

(Active Green) Solid green (On) indicates that the end to end E1 Link is up, signifying that the link is active. The E1 Link LED is Off when the link is down.

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10BT Link(Active Green)

Solid green indicates that the 10BaseT Ethernet interface has detected a valid SQE heartbeat, signifying a valid 10BaseT connection.

Status

Blinks yellow from one to eleven times to indicate system status. Each pulse pattern is separated by a 2 second “off” period. Greater pulse patterns have higher priority (buffer saturation has greater priority than an empty MAC table). Valid system statuses are:

1 pulse = system status is okay

2 pulses = no MAC entries in the MAC Address Table

3 pulses = Clear to Send (CTS) or Carrier Detect (DCD) from

base unit are not asserted

4 pulses = IM1/I buffer is saturated

5 pulses = WAN receive frame(s) too large

6 pulses = WAN receive frame(s) not octet aligned

7 pulses = WAN receive frame(s) aborted

8 pulses = Detected WAN receive frame(s) with CRC

9 pulses = Detected LAN receive frame(s) too large

10 pulses = Detected LAN receive frame(s) not octet aligned

LOS

TM

ER

11 pulses = Detected LAN receive frame(s) with bad CRC

The Loss of Sync LED lights when the unit loses synchronization with the incoming signal. This may happen when there is a framing mismatch or a loss of signal. In unframed mode, the LOS LED monitors the status of the transmit clock.

(Active Yellow) Solid Yellow indicates an Active Test Mode. The unit may be placed in test mode by the local user or by the remote user

The error LED indicates various error conditions, including framing bit errors, excessive zeros, controlled slips, severe errors, or bit errors (when sending V.52 test patterns). When sending a test pattern, the LED will remain lit if the unit does not receive the identical pattern. When it receives the correct pattern, the LED will turn off. If error insertion is on, the LED will blink once a second if everything is operating properly.

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6.3 LOOP (V.54 & TELCO) DIAGNOSTICS

The Model 2701/I offers three V.54 loop diagnostics. Use these diagnostics to test the NTU and any communication links. These tests can be activated via the front panel switches.

Operating Local Loopback (LL)

The Local Loopback (LL) test checks the operation of the local Model 2701/I, and is performed separately on each unit.

Figure 13. Local Loopback for a Network Termination Application

To perform a LL test, follow these steps:

1. Activate LL. This may be done by selecting local loop on the front

panel switch.

2. .Perform a V.52 BER (bit error rate) test as described on page 25. If

the BER test equipment indicates no faults, but the data terminal indicates a fault, follow the manufacturer’s checkout procedures for the data terminal. Also, check the interface cable between the terminal and the Model 2701/I.

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Operating Remote Digital Loopback (RL)

The Remote Digital Loopback (RL) test checks the performance of both the local and remote NetLink-E1™, as well as the communication link between them. Any characters sent to the remote NetLink-E1™ in this test mode will be returned back to the originating device.

Figure 14. Remote Loop in a Network Extension Application

There are two Remote Loops that can be initiated from the NetLink 2701/ I unit: (1) V.54 Loop, and; (2) CSU Loop. The user can select the type of loop that can be initiated by Switch S2-4. When a loopback is initiated this is the type of loop that the unit uses to loop up the remote unit and which type of loop the unit will respond to.

To perform an RDL test, follow these steps:

1. Activate RDL. This may be done by setting the front panel switch to

‘Remote’.

2. Perform a bit error rate test (BERT) using the internal V.52 genera-

tor (as described on page 25), or using a separate BER Tester. If the BER test indicates a fault, and the Local Line Loopback test was successful for both NetLink™s, you may have a problem with the twisted pair line connection.

CSU Loop

Although CSU Loop is predominantly a T1 function, the NetLink-2701/I responds to central ofﬁce initiated loop commands. Customers can use this facility when the Central Ofﬁce network switch supports CSU loops over an E1 interface.

When CSU Loop is selected, and when in D4 framing mode, the NetLink 2701/I will implement the “loop up” command when it recognizes the pattern “10000” in the data stream for a minimum of 5 seconds. The “loop

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down” command is implemented by the pattern “100” in the data stream for a minimum of 5 seconds.

The NetLink 2701/I will respond to Universal Loopback De-activate to clear all central ofﬁce loops.

Using the V.52 (BER) Test Pattern Generator

To use the V.52 BER tests in conjunction with the Remote Digital Loopback tests (or with Local Line Loopback tests), follow these instructions:

1. Locate the “511/511E” toggle switch on the front panel of the 2701/I

and move it UP. This activates the V.52 BER test mode and transmits a “511” test pattern into the loop. If any errors are present, the local modem’s red “ER” LED will blink sporadically.

2. If the above test indicates no errors are present, move the V.52 tog-

gle switch DOWN, activating the “511/E” test with errors present. If the test is working properly, the local modem's red “ER” LED will blink once per second. A successful “511/E” test will conﬁrm that the link is in place, and that the Model 2701/I’s built-in “511” generator and detector are working properly.

Note The above V.52 BER tests can be used independently of the

Remote Digital Loopback tests. This requires two operators: one to initiate and monitor the tests at the local Model 2701/I, and one to do the same at the remote Model 2701/I. In this case, the test pattern sent by each Model 2701/I will not be looped back, but will be transmitted down the line to the other Model 2701/I. While one operator initiates test, the other monitors for errors.

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APPENDIX A

SPECIFICATIONS

A.1 NETWORK DATA RATE

2.048 Mbps

A.2 NETWORK CONNECTOR

RJ-48C/Dual Coax BNC

A.3 NOMINAL IMPEDANCE

75/120 ohm

A.4 LINE CODING

Selectable AMI or HDB3

A.5 LINE FRAMING

G.703 (Unframed) or G.704/G.732 (Framed)

A.6 CRC-4 MULTIFRAMING

Selectable On or Off

A.7 CLOCKING

Internal or Network (Receive Recover)

A.8 TIME SLOT RATE

64 kbps

A.9 NETWORK DATA RATES

64, 128, 192, 256, 320,384, 448, 512, 576, 640, 704, 768, 832, 896, 960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728, 1792, 1856, 1920, 1984, 2048 kbps

A.10 DISTANCE

Maximum 1.6 km (5,250 ft.) on 24 AWG Cable

A.11 POWER SUPPLY

+5 VDC External power supply/100–240 VAC, 50–60Hz, 0.4A

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A.12 HUMIDITY

Up to 90% non-condensing

A.13 TEMPERATURE

0 to 50°C (32 to 122°F)

A.14 DIMENSIONS

Plastic Case – 9.0L x 5.3W x 2.0H cm (3.5L x 2.1W x 0.78H in.) Metal Case – 3.2L x 13.8W x 14.6H cm (1.25L x 5.43W x 5.75H in)

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APPENDIX B

ETHERNET 10BASE-T SPECIFICATIONS

B.1 DTE INTERFACE

10Base-T on RJ-45F

B.2 DTE DATA RATES

10Mbps

B.3 LAN CONNECTION

RJ-45, 10Base-T, 802.3 Ethernet

B.4 PROTOCOL

PPP (RFC 1661) with Bridging Control (RFC 1638)

B.5 MAC ADDRESS TABLE SIZE

4096 entries

B.6 MAC ADDRESS AGING

MAC addresses deleted after 8 minutes of inactivity

B.7 FRAME BUFFER

512 Frames

B.8 FRAME LATENCY

1 frame

B.9 DIAGNOSTICS

6V.54 Loopback; CSU Loopback; V.52 Patterns: 511

B.10 INDICATORS

E-1 Link, 10Base-T Link, Ethernet Status, Loss of Frame Sync, Error, Test Mode

B.11 CONFIGURATION

Two 8-Position DIP Switches

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APPENDIX C

FACTORY REPLACEMENT PARTS AND ACCESSORIES

Patton Model # Description

2701/B G.703/G.704 NTU with RS-530 interface 2701/C G.703/G.704 NTU with a V.35 interface 2701/D G.703/G.704 NTU with an X.21 interface

2701/I G.703/G.704 NTU w/ 10Base-T EN interface

08055DCUI Universal Input Power Supply

07M2701 User Manual

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.NOTES

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.NOTES

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31

NOTES

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Patton Electronics Company

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Patton electronic 2701-I User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual