Patton electronics NetLink 2701/B Manual de usuario

USER

MANUAL

MODEL 2701/B, C, D

G.703/G.704 NTU with

EIA-530, V.35, X.21 Interfaces

SALES OFFICE

(301) 975-1000

TECHNICAL SUPPORT

(301) 975-1007

http://www.patton.com

Part# 07M2701/x-A

Doc# 086101UA

Revised 02/08/00

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 2701/I components to be

free from defects, and will—at our option—repair or replace the prod-

uct 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 modifi-

cation. 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 consequen-

tial 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 RADIO AND TV INTERFERENCE

The Model 2701 generates and uses radio frequency energy, and

if not installed and used properly—that is, in strict accordance with the

manufacturer's instructions—may cause interference to radio and tele-

vision reception. The Model 2701 has been tested and found to com-

ply with the limits for a Class A computing device in accordance with

the specifications in Subpart J of Part 15 of FCC rules, which are

designed to provide reasonable protection from such interference in a

commercial installation. However, there is no guarantee that interfer-

ence will not occur in a particular installation. If the Model 2701 does

cause interference to radio or television reception, which can be deter-

mined by disconnecting the cables, the user is encouraged to try to

correct the interference by one or more of the following measures:

moving the computing equipment away from the receiver, re-orienting

the receiving antenna, and/or plugging the receiving equipment into a

different AC outlet (such that the computing equipment and receiver

are on different branches).

1.2 CE NOTICE

The CE symbol on your Patton Electronics equipment indicates

that it is in compliance with the Electromagnetic Compatibility (EMC)

directive and the Low Voltage Directive (LVD) of the Union European

(EU). A Certificate of Compliance is available by contacting Technical

Support.

1.3 SERVICE

All warranty and nonwarranty repairs must be returned freight pre-

paid and insured to Patton Electronics. All returns must have a Return

Materials Authorization number on the outside of the shipping contain-

er. This number may be obtained from Patton Electronics Technical

Services at:

tel: (301) 975-1007;

email: [email protected]; or,

www: 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. Technical Service hours: 8AM to 5PM EST,

Monday through Friday.

2.0 GENERAL INFORMATION

Thank you for your purchase of this Patton Electronics product.

This product has been thoroughly inspected and tested and is warrant-

ed for One Year parts and labor. If any questions or problems arise

during installation or use of this product, please do not hesitate to con-

tact 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 Mbps

• X.21, V.35, and EIA-530

• Switch-selectable AMI or HDB3 line encoding options

• Switch-selectable DTE/DCE modes for X.21 version

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

• Local and remote loopback diagnostics

• Internal and G.703 network timing

• CE and BABT approvals

• 90-260VAC & 48VDC power options

• Conforms to ONP requirements CTR 12 and CTR 13 for connec-

tion to international Telecom networks

2.2 DESCRIPTION

The Model 2701 receives channelized G.704 (n x 64kbps) or clear

channel E1/G.703 (2.048-Mbps) data from the telco's digital data net-

work. The Model 2701 terminates the G.703 telco interface and con-

verts the data for transmission to a user-oriented serial [X.21, V.35,

and EIA-530 (V.36/RS422)]. The 2701 can connect to a Router, FRAD,

PABX or Multiplexer over its serial interface at nx64kbps data rates up

to 2.048 Mbps.

3.0 CONFIGURATION

The Model 2701 features configuration capability via hardware DIP

switches. This section describes all possible DIP switch configurations

of the Model 2701.

3.1 DIP SWITCH CONFIGURATION

The Model 2701 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 of the 2701. Figure 1 (below) shows the

location of the DIP switches on the bottom of the printed circuit board.

The Model 2701 DIP switches (Switch Sets 1-2) can be configured

as either “ON” or “OFF”. Figure 2 (below) shows the orientation of the

DIP switches with respect to ON/OFF positions.

Figure 1. Underside of Model 2701, Showing Location of DIP Switches

Front

Rear

OFF

12345678

DHS-8

Figure 2. Close up of configuration switches

OFF

Switch SW1-1 through SW1-5

A detailed description of each switch (SW1-1 through SW1-5) setting

follows the summary table below.

Use Switches SW1-5 to set the DTE data rate.

SW1 SW2 SW3 SW4 SW5 Speed

ON ON ON ON ON 64kbps

OFF ON ON ON ON 128kbps

ON OFF ON ON ON 192kbps

OFF OFF ON ON ON 256kbps

ON ON OFF ON ON 320kbps

OFF ON OFF ON ON 384kbps

ON OFF OFF ON ON 448kbps

OFF OFF OFF ON ON 512kbps

ON ON ON OFF ON 576kbps

OFF ON ON OFF ON 640kbps

ON OFF ON OFF ON 704kbps

OFF OFF ON OFF ON 768kbps

ON ON OFF OFF ON 832kbps

OFF ON OFF OFF ON 896kbps

ON OFF OFF OFF ON 960kbps

OFF OFF OFF OFF ON 1024kbps

ON ON ON ON OFF 1088kbps

OFF ON ON ON OFF 1152kbps

ON OFF ON ON OFF 1216kbps

OFF OFF ON ON OFF 1280kbps

ON ON OFF ON OFF 1344kbps

OFF ON OFF ON OFF 1408kbps

ON OFF OFF ON OFF 1472kbps

OFF OFF OFF ON OFF 1536kbps

ON ON ON OFF OFF 1600kbps

OFF ON ON OFF OFF 1664kbps

ON OFF ON OFF OFF 1728kbps

OFF OFF ON OFF OFF 1792kbps

ON ON OFF OFF OFF 1856kbps

OFF ON OFF OFF OFF 1920kbps

ON OFF OFF OFF OFF 1984kbps

OFF OFF OFF OFF OFF Clear Channel 2048kbps

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 and SW1-7 CLOCK MODES

Use Switches SW1-6 and SW1-7 to configure the 2701 for internal,

external, or receive recover clock mode.

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.

External Clock Transmitter timing is derived from DTE terminal tim

ing.

SW1-8: Enable/Disable Loop Tests from DTE

Use Switch SW1-8 to allow Model 2701 to enter loopback tests when

the DTE raises the appropriate loop request pin.

S1-8 Setting

Off Response to DTE Loopback Request Enabled

On Response to DTE Loopback Request Disabled

SWITCH SET 1 SUMMARY TABLE

Position Function Factory Default Selected Option

SW1-1 DTE Rate OFF

SW1-2 DTE Rate OFF

SW1-3 DTE Rate OFF

SW1-4 DTE Rate OFF

SW1-5 DTE Rate OFF

SW1-6 Clock Mode OFF Receive Recovered

SW1-7 Clock Mode OFF Receive Recovered

SW1-8 TM from DTE OFF Enabled

2.048 Mbps

Clear

Channel

}SW1-6 SW1-7 Clock Mode

On On Network (Recieved Recovered)

On Off Internal

Off On External

Off Off Network (Recieved Recovered)

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 2701s 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

bipolar 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 connec-

tion, 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 transmit-

ted.This means, however, that a long sequence of zeros in

the data stream will 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 accept-

able 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 require-

ments.

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 CRC-4 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 inver-

sion is not necessary.

SW2-3 Option

Off Data not inverted

On Data inverted

SWITCH SW2-4: REMOTE DIGITAL LOOPBACKTYPE

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 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.

SWITCH SET 2 SUMMARY TABLE

Position Function Factory Default Selected Option

SW2-1 Line Coding OFF HDB3

SW2-2 CRC-4 multiframe OFF Disabled

SW2-3 Data Inversion OFF Data Not Inverted

SW2-4 V.54/CSU select OFF

V.54 RDL loop

SW2-5 FPS enabled OFF Enabled

SW2-6 V.54 Response OFF Enabled

SW2-7 Not Used N/A N/A

SW2-8 Not Used N/A N/A

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 ENABLED

(DEFAULT)

V.54 Response is a special in-band loopback facility that sends a pseu-

do-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

44..00

IINNSSTTAALLLLAATTIIOONN

Once the Model 2701 is properly configured, it is ready to connect

to the G.703/G.704 interface, to the serial port, and to the power

source. This section describes how to make these connections.

4.1 CONNECTING TO THE G.703 NETWORK

The Power, G.703/G.704 and serial Line connections are located

on the rear panel of the Model 2701. The following sections describe

operation of these connections.

4.1.1

Connecting the 2701/D (X.21 version) Dual Coaxial Cable (75

ohm) to the G.703 Network

The Model 2701/D

(X.21 version)

is equipped with dual female

BNCs (TX and RX) for connection to a 75 ohm dual coax G.703 net-

work interface. If your G.703/G.704 network terminates via dual coaxial

cable, use the diagram below to make the proper connections. See

Figure 3 below.

NOTE: The outer conductor of the coax cables are isolated from

system earth ground.

When using the 75 Ohm interface, jumper straps JP3, JP6, JP7,

and JP8 must be installed over the jumpers. The jumpers are located

next to the BNC connectors. Refer to the following section to open the

case. Open the case and install jumper straps for JP3, JP6, JP7, and

JP8.

4.1.2 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.

Data TO

Network Data

FROM

Network

Figure 3: Rear Panel, Showing Location of Connectors.

TX RX

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

Network

The Model 2701 is equipped with a single RJ-48C jack for connec-

tions 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 dia-

gram (Figure 4) following the pinout and signals chart below to connect

the 120 ohm G.703/G.704 network channel.

RJ-45 Cable (8-Wire)

G.703/G.704 2701

NETWORK SIGNAL SIGNAL

PIN#

RX+ 1-----------------------TX+

RX- 2-----------------------TX-

TX+ 5-----------------------RX+

TX- 4-----------------------RX

Shield 3-----------------------Shield

Shield 6-----------------------Shield

4.2 Connecting the Serial Port

The Model 2701/B, C, D supports RS-530, V.35, X.21 serial port

connections. This section describes how to connect the serial ports to

your terminal equipment.

4.2.1 Connecting to a “DTE” Device

The serial port on the 2701/B (RS-530 version) and 2701/C (V.35

version) is hard-wired as a DCE. Therefore these modules “want” to

plug into a DTE such as a terminal, PC or host. When making the

connection to your DTE device, use a straight through cable of the

shortest possible length—we recommend 6 feet or less. When pur-

chasing or constructing an interface cable, please refer to the pin dia-

grams in Appendix D as a guide.

4.2.2 Connecting to a “DCE” Device

If the Model 2701 serial interface is hard-wired as a DCE (all

except the X.21 version), you must use a

null modem

cable when con-

necting to a modem, multiplexer or other DCE device. This cable

should be of the shortest possible length—we recommend 6 feet or

less.

4.2.3 Configuring the X.21 Interface (2701/D)

The serial port on the X.21 interface is default wired as a DCE, but

may be switched to a DTE. This is done by reversing the orientation of

the DCE/DTE strap, as described below:

To reverse DCE/DTE orientation, remove the top case. Refer to

section 4.1.2.

The DCE/DTE strap is located near the DB15 connector on the

top side of the board. The arrows on the top of the strap indicate the

configuration of the X.21 port (for example, if the DCE arrows are

pointing toward the DB-15 connector, the X.21 port is wired as a DCE).

Reverse the DCE/DTE orientation by pulling the strap out of its socket,

rotating it 180º, then plugging the strap back into the socket. You will

see that the DCE/DTE arrows now point in the opposite directions,

showing the new configuration of the X.21 port.

NOTE: If the 2701/D is configured as a DTE, the clocking mode

must be set for external clock.

(No Connection) 8

(No Connection) 7

(No Connection) 6

(TX+) 5

(TX-) 4

(No Connection) 3

(RX-) 2

(RX+) 1

Figure 4: G.703/G.704 170 Ohm Connection.

4.4 POWER CONNECTION

Universal AC Power (100-240VAC)

The Model 2701 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 con-

nects to the Model 2701 by means of a barrel jack on the rear panel.

Many international power cords are available for the universal power

supply.

The Model 2701 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 supplied with the DC version of

the Model 2701 plugs in a DC source (nominal 48VDC) and plugs into

the barrel power supply jack on the rear of the 2701. Please refer to

Figure 5, below, to make the proper connection.

55..00

OOPPEERRAATTIIOONN

When the Model 2701 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.

5.1 POWER-UP

Before applying power to the Model 2701, please read Section

4.3 and ensure that the unit is properly connected to the appropriate

power source.

5.2 LED STATUS MONITORS

The Model 2701 features six front panel LEDs that monitor con-

nections on the G.703/G.704 and signaling, error and test modes.

Figure 6 (below) shows the front panel location of each LED.

Descriptions of each LED follow Figure 6.

E1 Link (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.

TD & RD Glows yellow to indicate an idle condition of Binary

“1” data on the respective terminal interface sig-

nals. Green indicates Binary “0” data.

LOS 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 moni

tors the status of the transmit clock.

ER The error LED indicates various error conditions,

including framing bit errors, excessive zeros, con-

trolled slips, severe errors, or bit errors (when

sending V.52 test patterns). When sending a test

Figure 6: 2701 Front Panel

WARNING! There are no user-serviceable parts in the

power supply section of the Model 2701. For more informa-

tion, please contact Patton Electronics Technical support at

(301)975-1007

, via our web site at http://www.patton.com, or

by e-mail at [email protected].

Figure 5: Connecting DC Power to the 2701 DC Power Supply.

+ Vin

To Power

Supply Jack

- Vin

To -48VDC

Source

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 inser-

tion is on, the LED will blink once a second if

everything is operating properly.

TM (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.

5.3 LOOP (V.54 & TELCO) DIAGNOSTICS

The Model 2701 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 or via signals on the

Model 2701/B and C serial port interface.

5.3.1 Operating Local Loopback (LL)

The Local Loopback (LL) test checks the operation of the local

Model 2701, and is performed separately on each unit. Any data sent

to the local Model 2701 in this test mode will be echoed (returned)

back to the user device (i.e., characters typed on the keyboard of a ter-

minal will appear on the terminal screen).

To perform a LL test, follow these steps:

1. Activate LL. This may be done in one of two ways:

a. Place the switch on the front panel in the “Local” position.

b. Activate the “LL” signal on the DTE (2701/B and 2701/C

only). If you are not sure which lead is the “LL” signal,

please refer to Appendix D.

2. Verify that the data terminal equipment is operating properly

and can be used for a test.

3. Perform a V.52 BER (bit error rate) test as described in

Section 5.3.4. If the BER test equipment indicates no faults,

but the data terminal indicates a fault, follow the manufactur-

er’s checkout procedures for the data terminal. Also, check

the interface cable between the terminal and the Model 2701.

5.3.2 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 (i.e, char-

acters typed on the keyboard of the local terminal will appear on the

local terminal screen after having been passed to the remote NetLink-

E1™ and looped back).

There are two Remote Loops that can be initiated from the

NetLink-E1 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 in two ways (refer to a. and

b. on the following page:

Figure 7. Local Loopback for a Network Termination Application

Serial

Device

Serial

Device

Model 2701 Serial

Receive

Recover

Clocking

Internal

Clocking

Cable Span

G.703/G.704 NTU

Model 2701 Serial G.703/G.704 NTU

Model 2701 Serial

Clock/

Data

Clock/

Data

Clock/

Data

Model 2701 Figure 8. Remote Loop in a Network Extension Application

Serial

Device Ethernet

Device

Model 2701/I

Receive

Recover

Clocking

Internal

Clocking

Cable Span

G.703/G.704 NTU

Model 2701 Serial G.703/G.704 NTU

Model 2701 Serial

Clock/

Data

Clock/

Data

Clock/

Data

Model 2701/I

15 16

a. Activate the “RL” signal on the DTE (2701/B and 2701/C

only). If you are not sure which lead is the “RL” signal, please

refer to Appendix B or C, depending on the version you are

using.

b. Set the front panel switch to “Remote”.

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

generator (as described in Section 5.3.4), 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.

5.3.3 CSU Loop

Although CSU Loop is predominantly a T1 function, the NetLink-

2701 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, the NetLink 2701 will implement the

“loop up” command when it recognizes the pattern “10000” in the data

stream for a minimum of 5 seconds. The “loop down” command is

implemented by the pattern “100” in the data stream for a minimum of

5 seconds.

The NetLink 2701 will respond to Universal Loopback De-activate

to clear all central office loops.

5.3.4 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 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 will illuminate.

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

toggle switch DOWN, activating the “511/E” test with errors pre

sent. If the test is working properly, the local modem's red “ER”

LED will blink once every second. A successful “511/E” test will

confirm that the link is in place, and that the Model 2701’s built-in

“511” generator and detector are working properly.

NOTE: The above V.52 BER tests can be used independent-

ly of the Remote Digital Loopback tests. This requires two

operators: one to initiate and monitor the tests at the local

Model 2701, and one to do the same at the remote Model

2701. In this case, the test pattern sent by each Model 2701

will not be looped back, but will be transmitted down the line

to the other Model 2701. While one operator initiates test, the

other monitors for errors.

17 18

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