3com MSR 50-40 Installation guide

H3C MSR 50 Series Routers

Installation Manual

Hangzhou H3C Technologies Co., Ltd.

http://www.h3c.com

Manual Version: T2-08047M-20081106-C-1.03

No part of this manual may be reproduced or transmitted in any form or by any means without prior

written consent of Hangzhou H3C Technologies Co., Ltd.

Trademarks

H3C, , Aolynk, , H

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Care,

, TOP G, , IRF, NetPilot, Neocean, NeoVTL,

SecPro, SecPoint, SecEngine, SecPath, Comware, Secware, Storware, NQA, VVG, V

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G, V

n

G, PSPT,

XGbus, N-Bus, TiGem, InnoVision and HUASAN are trademarks of Hangzhou H3C Technologies Co.,

Ltd.

All other trademarks that may be mentioned in this manual are the property of their respective owners.

Notice

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute the warranty of any kind, express or implied.

Technical Support

customer_service@h3c.com

http://www.h3c.com

About This Manual

Organization

MSR 50 Series Routers Installation Manual is organized as follows:

Chapter Contents

1 Overview

Briefly introduces the appearance, system description, as well as

the features and applications of the MSR 50 series.

2 Installation Preparation

Describes the requirements on installation site, the safety

recommendations before and during installation, and the required

tools.

3. Installation

Covers the procedures for installing the MSR 50 series, power cord

connection, AUX cable connection, Console cable connection,

Ethernet cable connection and Synchronous/asynchronous serial

interface cable connection.

4. Startup and Configuration

Helps you get familiar with the basic knowledge of how to boot and

configure the MSR 50 series, including device startup, power-on,

and initialization of system files, and so on.

5. Software Maintenance

Introduces how to maintain BootROM menu and software of the

MSR 50 series.

6. Hardware Maintenance

Introduces how to install and remove SDRAM, ESM/VCPM card

and CF card of the MSR 50 series.

7. Troubleshooting Describes some problems that may arise and how to solve them.

Conventions

The manual uses the following conventions:

Command conventions

Convention Description

Boldface

The keywords of a command line are in Boldface.

italic

Command arguments are in italic.

[ ] Items (keywords or arguments) in square brackets [ ] are optional.

{ x | y | ... }

Alternative items are grouped in braces and separated by vertical bars.

One is selected.

[ x | y | ... ]

Optional alternative items are grouped in square brackets and

separated by vertical bars. One or none is selected.

{ x | y | ... } *

Alternative items are grouped in braces and separated by vertical bars.

A minimum of one or a maximum of all can be selected.

[ x | y | ... ] *

Optional alternative items are grouped in square brackets and

separated by vertical bars. Many or none can be selected.

&<1-n>

The argument(s) before the ampersand (&) sign can be entered 1 to n

times.

# A line starting with the # sign is comments.

GUI conventions

Convention Description

< > Button names are inside angle brackets. For example, click <OK>.

[ ]

Window names, menu items, data table and field names are inside

square brackets. For example, pop up the [New User] window.

/

Multi-level menus are separated by forward slashes. For example,

[File/Create/Folder].

Symbols

Convention Description

Means reader be extremely careful. Improper operation may cause

bodily injury.

Means reader be careful. Improper operation may cause data loss or

damage to equipment.

Means a complementary description.

Related Documentation

In addition to this manual, each MSR Series Routers documentation set includes the following:

Manual Description

MSR Series Routers User

Manual

It is a guide for the user to perform the operations correctly. It is

organized into the parts of getting started, system management,

interface, link layer protocol, network protocol, routing protocol,

multicast protocol, security, VPN, reliability, QoS, dial-up and VoIP,

as well as acronyms used in the manual.

It gives the user a detailed description of the operating commands.

It is organized into the parts of getting started, system

management, interface, link layer protocol, network protocol,

routing protocol, multicast protocol, security, VPN, reliability, QoS,

dial-up and VoIP, as well as a command index.

MSR Series Routers

Interface Card and Interface

Module Manual

It covers the pinouts, function, interface attributes, panels and

LEDs of all interface cards and modules available with the router.

MSR 20-1X Series Routers

Installation Manual

This guide describes the MSR 20-1X Series Routers and how to

install hardware, configure and boot software, and maintain

software and hardware. This guide also provides troubleshooting

and support information for your router.

MSR 20 Series Routers

Installation Manual

This guide describes the MSR 20 Series Routers and how to install

hardware, configure and boot software, and maintain software and

hardware. This guide also provides troubleshooting and support

information for your router.

MSR 50 Series Routers

Installation Manual

This guide describes the MSR 30 Series Routers and how to install

hardware, configure and boot software, and maintain software and

hardware. This guide also provides troubleshooting and support

information for your router.

MSR 20-1x Series Routers

Web-Based Configuration

Manual

It provides guidelines to Web-based configuration on the MSR

20-1x Series Routers.

MSR 20/30/50 Series

Routers Web-Based

Configuration Manual

It provides guidelines to Web-based configuration on the MSR

20/30/50 Series Routers.

Obtaining Documentation

You can access the most up-to-date H3C product documentation on the World Wide Web at this URL:

http://www.h3c.com.

The following are the columns from which you can obtain different categories of product documentation:

[Products & Solutions]: Provides information about products and technologies, as well as solutions.:

Provides information about products and technologies.

[Technical Support & Document > Technical Documents]: Provides several categories of product

documentation, such as installation, operation, and maintenance.

[Technical Support & Document > Product Support > Software]: Provides the documentation released

with the software version.

Documentation Feedback

You can e-mail your comments about product documentation to [email protected].

We appreciate your comments.

Environmental Protection

This product has been designed to comply with the requirements on environmental protection. For the

proper storage, use and disposal of this product, national laws and regulations must be observed.

1

Table of Contents

1 Overview.....................................................................................................................................................1-1

Introduction .............................................................................................................................................1-1

Fixed Interface.................................................................................................................................1-1

Interface Card..................................................................................................................................1-1

Processor and Memory...................................................................................................................1-2

Other Hardware Specifications........................................................................................................1-2

MSR 50-40/50-60 Routers ..............................................................................................................1-3

Generic Modules.....................................................................................................................................1-5

MPUF...............................................................................................................................................1-5

MSCA ............................................................................................................................................1-11

PSU ...............................................................................................................................................1-12

FAN Module...................................................................................................................................1-13

SIC/DSIC and FIC/DFIC Interface Cards......................................................................................1-14

ESM Module..................................................................................................................................1-14

Voice Module.................................................................................................................................1-15

2 Installation Preparations...........................................................................................................................2-1

Requirements on Environment ...............................................................................................................2-1

Requirements on Temperature/Humidity ........................................................................................2-1

Requirements on Cleanness...........................................................................................................2-1

Requirements on Electrostatic Discharge Prevention.....................................................................2-2

Requirements on Electromagnetic Environments...........................................................................2-2

Requirements on Preventing Lightning...........................................................................................2-3

Requirements on Workbench..........................................................................................................2-3

Safety Precautions..................................................................................................................................2-3

Installation Tools, Meters and Equipments.............................................................................................2-4

3 Installation..................................................................................................................................................3-1

Installation Process.................................................................................................................................3-1

Installing the Cabinet...............................................................................................................................3-2

Installing the Router................................................................................................................................3-2

Installing the Router on a Workbench.............................................................................................3-2

Installing the Router in a Rack ........................................................................................................3-2

Installing Generic Modules......................................................................................................................3-3

Connecting the PGND.............................................................................................................................3-3

Connecting the Power Cord....................................................................................................................3-4

Power Input and PGND...................................................................................................................3-4

Connecting the AC Power Cord......................................................................................................3-4

Connecting the DC Power Cord......................................................................................................3-5

Connecting the Console Terminal...........................................................................................................3-6

Fixed Interfaces.......................................................................................................................................3-7

Ethernet Interface............................................................................................................................3-7

Connecting AUX to a Modem........................................................................................................3-10

Interface Card Module...........................................................................................................................3-11

Installing/Removing Slide Rail ..............................................................................................................3-11

2

MSR 50 Series Slide Rail..............................................................................................................3-11

Installing Slide Rail........................................................................................................................3-12

Removing Slide Rail......................................................................................................................3-13

Verifying Installation..............................................................................................................................3-14

4 Startup and Configuration ........................................................................................................................4-1

Startup.....................................................................................................................................................4-1

Setting up Configuration Environment.............................................................................................4-1

Powering on the Router...................................................................................................................4-3

Startup Process...............................................................................................................................4-4

Configuration Fundamentals...................................................................................................................4-5

Basic Configuration Procedures......................................................................................................4-6

Command Line Interface.................................................................................................................4-6

Arranging Slots and Numbering Interfaces .....................................................................................4-7

5 Software Maintenance...............................................................................................................................5-1

Introduction .............................................................................................................................................5-1

Files.................................................................................................................................................5-1

Software Maintenance Methods......................................................................................................5-3

BootROM Menu ......................................................................................................................................5-4

Main BootROM Menu......................................................................................................................5-4

BootROM Submenus.......................................................................................................................5-6

Upgrading BootROM Through Serial Port ..............................................................................................5-8

Modifying Serial Port Parameters....................................................................................................5-9

Upgrading BootROM.....................................................................................................................5-11

Upgrading Application Program Through Serial Port............................................................................5-12

Upgrading Application Program Through Ethernet Interface................................................................5-12

Configuring Ethernet Parameters..................................................................................................5-12

Upgrading Application Program Through Ethernet Interface........................................................5-14

Maintaining Application Program and Configuring Through Command Lines......................................5-16

Maintaining the Router with TFTP Server.....................................................................................5-16

Maintaining the Router with FTP Server .......................................................................................5-18

Maintaining Application Program and Configuration File......................................................................5-21

Dealing with Router Password Loss.....................................................................................................5-23

User Password Loss......................................................................................................................5-23

BootROM Password Loss .............................................................................................................5-24

Super Password Loss....................................................................................................................5-24

Backing up and Restoring BootROM....................................................................................................5-24

6 Hardware Maintenance..............................................................................................................................6-1

Preparing Tools.......................................................................................................................................6-1

Internal Structure.....................................................................................................................................6-1

Removing/Installing PSUs ......................................................................................................................6-3

Removing a PSU.............................................................................................................................6-3

Installing a PSU...............................................................................................................................6-3

Removing/Installing the Fan Module.......................................................................................................6-3

Removing the Fan Module..............................................................................................................6-4

Installing the Fan Module................................................................................................................6-4

Removing/Installing the MPUF ...............................................................................................................6-4

Removing the MPUF.......................................................................................................................6-5

3

Installing the MPUF.........................................................................................................................6-5

Removing/Installing MSCA.....................................................................................................................6-6

Removing MSCA.............................................................................................................................6-6

Installing MSCA...............................................................................................................................6-6

Installing/Removing CF Card..................................................................................................................6-6

CF Card Structure ...........................................................................................................................6-6

Installing CF Card............................................................................................................................6-7

Removing CF Card..........................................................................................................................6-7

Replacing Memory Bar............................................................................................................................6-8

Memory Bar Structure .....................................................................................................................6-9

Memory Bar Slot..............................................................................................................................6-9

Installing/Removing Memory Bar ....................................................................................................6-9

Replacing VPM .....................................................................................................................................6-10

VPM Structure...............................................................................................................................6-10

VPM Slot........................................................................................................................................6-11

Installing/Removing VPM..............................................................................................................6-11

Installing/Removing ESM/VCPM Card..................................................................................................6-11

7 Troubleshooting.........................................................................................................................................7-1

Troubleshooting the Power System........................................................................................................7-1

Troubleshooting the Configuration System.............................................................................................7-1

Troubleshooting Application Software Upgrade .....................................................................................7-2

i

Table of Contents

1 Overview·····················································································································································1-1

Introduction ·············································································································································1-1

Fixed Interface·································································································································1-1

Interface Card··································································································································1-1

Processor and Memory ···················································································································1-2

Other Hardware Specifications········································································································1-2

MSR 50-40/50-60 Routers ··············································································································1-3

Generic Modules ·····································································································································1-5

MPUF···············································································································································1-5

MSCA ············································································································································1-11

PSU ···············································································································································1-12

FAN Module···································································································································1-13

SIC/DSIC and FIC/DFIC Interface Cards ······················································································1-14

ESM Module ··································································································································1-14

Voice Module·································································································································1-15

1-1

1 Overview

Introduction

MSR 50 Series Routers were self-developed by our company. for use on enterprise-level networks.

Depending on the network size, MSR 50 Series Routers can be either core routers on small and

medium enterprise networks, or access routers for network branches on some large-sized enterprise

networks. Therefore, MSR 50 Series Routers are suitable for the application on the carrier-level

networks, such as telecom management networks and billing networks. MSR 50 Series Routers adopt

modular design and support a wide range of optional interface cards and service modules, including

flexible interface card (FIC), smart interface card (SIC), multi-service card A (MSCA), enhanced service

module (ESM), voice processing module (VPM) and voice co-processing module (VCPM). Base on

power supply mode, the MSR 50-40 and MSR 50-60 each have two models: AC, DC.

You can choose to use a DC or AC power supply unit (PSU) as the system power supply, or install two

AC or two DC PSUs to form 1+1 redundancy backup.

The PSUs, fan trays, and FICs of MSR 50 series routers are all hot swappable.

Currently, the MSR 50 series include these models:

z MSR 50-40

z MSR 50-60

Fixed Interface

Table 1-1 MSR 50-40/50-60 Routers interface description

Item MSR 50-40 MSR 50-60

Console 1 1

AUX 1 1

USB 2 2

GE 2 COMBO interfaces 2 COMBO interfaces

Fixed

interfaces

FE switching interface 0 0

Interface Card

Table 1-2 MSR 50-40/50-60 Routers interface card description

Item MSR 50-40 MSR 50-60

SIC module 4 4

FIC module 4 6

External

modules

MSCA module 1 1

1-2

Item MSR 50-40 MSR 50-60

ESM module 2 2

VPM module 4 4

Internal

modules

VCPM module 1 1

Processor and Memory

Table 1-3 MSR 50-40/50-60 Routers processor and memory description

Item MSR 50-40 MSR 50-60

Processor PowerPC PowerPC

BootROM 4 MB 4 MB

Memory

DDR SDRAM:

Default: 512 MB

Max: 1 GB

DDR SDRAM:

Default: 512 MB

Max: 1 GB

CF card

Default: 256 MB

Max: 1 GB

Default: 256 MB

Max: 1 GB

z BootROM stores bootstrap.

z Communication data between the system and the CPU is stored in the memory when the system is

running.

z The CF card is used to store the software system and configuration file. The CF card LED blinks

when the system is reading/writing data from/to the CF card. In this case, do not remove the CF

card; otherwise hardware and software damage may occur.

Other Hardware Specifications

Table 1-4 Specifications description of other hardware

Item MSR 50-40 Description MSR 50-60 Description

Dimensions

(H × W × D)

(excluding feet and rack-mounting ear)

130.7 × 436.2 × 424 mm

(5.15 × 17.17 × 16.70 in.)

175.1 × 436.2 × 424 mm

(6.89 × 17.17 × 16.69 in.)

Weight 18 kg (39.68 lb.) 20 kg (44.09 lb.)

AC input Rated voltage: 100 VAC to 240 VAC; 50 Hz/60 Hz

DC input Rated voltage: –48 VDC to –60 VDC

Operating temperature 0°C to 40°C (32°F to 104°F)

Relative humidity (noncondensing) 5% to 90%

1-3

MSR 50-40/50-60 Routers

Appearance

1) Front view of MSR 50-40

Figure 1-1 Front panel of the MSR 50-40

(1) (2) (3)(4) (5)(6)

(7)

(8) (10) (9)

(1) CF card LED (2) CF card

(3) SIC slot 1 (4) SIC slot 2

(5) SIC slot 3 (6) SIC slot 4

(7) FIC slot 5 (8) FIC slot 6

(9) FIC slot 7 (10) FIC slot 8

2) Rear view of MSR 50-40

Figure 1-2 Rear view of MSR 50-40

(1)

(3)

(2)

(5)(6)

(4)

(1) MSCA slot (2) System power 1 slot

(3) System power 0 slot (4) System power socket

(5) Grounding terminal (6) Fan slot

3) Front view of MSR 50-60

1-4

Figure 1-3 Front panel of the MSR 50-60

(1) (2) (3)(4) (5)(6)

(7)(8) (10)

(9) (11)

(12)

(1) CF card LED (2) CF card

(3) SIC slot 1 (4) SIC slot 2

(5) SIC slot 3 (6) SIC slot 4

(7) FIC slot 5 (8) FIC slot 6

(9) FIC slot 7 (10) FIC slot 8

(11) FIC slot 9 (12) FIC slot 10

4) Rear view of MSR 50-60

Figure 1-4 Rear view of MSR 50-60

(1)

(3)

(2)

(6)(7)

(5)

(4)

(1) MSCA slot (2) System power 2 slot

(3) System power 1 slot (4) System power 0 slot

(5) System power socket (6) Grounding terminal

(7) Fan slot

1-5

Generic Modules

The MSR 50 series is available with the generic modules as power modules, SICs and interface

modules. Currently, it primarily supports the main board MPUF. See details as follows.

MPUF

Functions

As the core of the router, the MPUF functions to process protocols, forward low-speed packets, govern

interfaces, and detect faults. You can gather information about the operating state of FAN module, PSU,

and system by reading their corresponding LEDs on the main control board; alternatively, you can

monitor state using a network management system. In addition, the main control board provides a

hardware reset button: RESET.

Appearance

Figure 1-5 MPUF front view

Figure 1-6 MPUF internal structure

1-6

Specifications

Table 1-5 MPUF specifications

Item Specifications

Interfaces

2 10/100/1000 Mbps Ethernet COMBO interfaces

1 AUX port

1 console port

2 USB interfaces

Processor 833 MHz

BootROM 4 MB

DDR SDRAM

Default: 512 MB

Max: 1 GB

CF Card

Default: 256 MB

Max: 1 GB

Slot 4 SIC slots

z DDR SDRAM (synchronous dynamic random access memory) is the memory.

z CF card functions as the major file storage medium to store application program files, anomaly

information, and configuration files.

z BootROM stores bootstrap files.

LED and interface

Figure 1-7 LEDs and interfaces

1-7

Figure 1-8 Big view of LEDs and interfaces

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

( 9 )

(1 0)

(1 1)

(1 2)

(13)

(15)

(16)

(17)

(18)(14) (19)

(20)

(22)

(21)(23)

(24)

(25)

(1) System LED (SYS) (2) Fan LED (FAN)

(3) Power LED 1 (PWR1) (4) Power LED 0 (PWR0)

(5) VPM LED 3 (VPM3) (6) VPM LED 2 (VPM2)

(7) VPM LED 1 (VPM1) (8) VPM LED 0 (VPM0)

(9) VCPM LED (VCPM) (10) ESM LED 1 (ESM1)

(11) ESM LED 0 (ESM0) (12) USB Slave LED (USB0)

(13) Fixed gigabit electrical interface 0 LED (14) Fixed gigabit electrical interface 1 LED

(15) Fixed gigabit optical interface 0 LED (16) Fixed gigabit optical interface 1 LED

(17) USB interface 0 (18) USB interface 1

(19) Console port (CONSOLE) (20) Auxiliary port (AUX)

(21) Fixed gigabit electrical interface 0 (22) Fixed gigabit electrical interface 1

(23) Fixed gigabit optical interface 0 (24) Fixed gigabit optical interface 1

(25) RESET LED

1) LED attributes

Table 1-6 LED attributes

LED Color Number Status Meaning

Off

No power input, or the main control

board has failed.

Green, blinking (0.5 Hz)

The interface card is running as

configured.

Green, blinking (4 Hz) The system is being booted.

SYS

Green &

yellow

1

Yellow The system has failed.

Off Power 1 is not present.

Steady green

Power 1 is present and working

normally.

PWR0

Green &

yellow

1

Yellow Power 1 has failed.

Off Power 2 is not present.

Steady green

Power 2 is present and working

normally.

PWR1

Green &

yellow

1

Yellow Power 2 has failed.

1-8

LED Color Number Status Meaning

Off The FAN module is not present.

Steady green

The FAN module is working

normally.

FAN

Green &

yellow

1

Yellow The FAN module has failed.

Off VPMx is not present.

Steady green VPMx is present,

VPM

0-3

Green &

yellow

4

Yellow VPMx has failed.

Off ESMx is not present.

Steady green ESMx is present.

Green, blinking ESMx is processing services.

ESM0-1

Green &

yellow

2

Yellow ESMx has failed.

Off VCPM is not present.

Steady green

VCPM is present and operating

normally.

VCPM

Green &

yellow

1

Yellow VCPM has failed.

Off No LINK.

Green SFP optical module gigabit LINK

Green, blinking

SFP optical module is transmitting or

receiving data.

SFP0-1

Green &

yellow

2

Yellow SFP has not passed the test.

Off No CF card.

Steady green

CF card is present, and can be

identified by the router.

Green, blinking

The system is accessing the CF

card (In this case, the card cannot

be removed).

CF

Green &

Yellow

1

Yellow

CF card cannot be identified by the

router.

Off USB is not connected to HOST.

Steady green

USB is connected to HOST, when it

can be removed.

USB0 Green 1

Green, blinking

USB is transmitting data, when it

cannot be removed.

Off No connection is established.

Green

1000 Mbps connection is

established.

Green, blinking

Active. GE0/0 is transmitting or

receiving data.

Yellow

10/100 Mbps connection is

established.

GE0/0

Green &

yellow

1

Yellow, blinking

Active. GE0/0 is transmitting or

receiving data.

1-9

LED Color Number Status Meaning

Off No connection is established.

Green

1000 Mbps connection is

established.

Green, blinking

Active. GE0/1 is transmitting or

receiving data.

Yellow

10/100 Mbps connection is

established.

GE0/1

Green &

yellow

1

Yellow, blinking

Active. GE0/1 is transmitting or

receiving data.

RESET

—

Reset button

2) Console port

Table 1-7 Console port attributes

Attribute Description

Connector RJ-45

Interface standard RS232

Baud rate

9600 bps to 115200 bps

9600 bps (default)

Function

Connecting to the ASCII terminal

Connecting to the serial interface of the local PC and running

terminal emulation program on the PC.

Command line interface

3) AUX port

Table 1-8 AUX port attributes

Attribute Description

Connector RJ-45

Interface standard RS232

Baud rate 300 bps to 115200 bps

Function

Modem dialup

Backup

4) Ethernet interface

The MPUF provides two 10/100/1000 Mbps Ethernet interfaces that each accommodates an RJ-45

connector and a small form-factor pluggable (SFP) module respectively for electrical and optical

connections. But you can use only one connection at a time.

Five types of 1000Base-FX SFP transceiver modules are available: multi-mode short-haul (850 nm),

single-mode medium-haul (1310 nm), single-mode long-haul (1310 nm), single mode long-haul (1550

nm), and single-mode ultra-long haul (1550 nm). They all provide LC interfaces and are hot swappable.

1-10

The attributes are listed in the following table:

Table 1-9 1000 Mbps Ethernet electrical interface attributes

Attribute Description

Connector RJ-45

Interface MDI/MDIX auto-sensing

Frame format

Ethernet_II

Ethernet_SNAP

Operating mode

10/100/1000 Mbps auto-sensing

Full duplex/half duplex

(1000 Mbps and half duplex cannot be configured together.)

Table 1-10 1000 Mbps Ethernet optical interface attributes

Description

Attribute

Multi-mode

short-haul

(850 nm)

Single-mod

e

medium-ha

ul (1310 nm)

Single-mod

e long-haul

(1310 nm)

Single-mod

e long-haul

(1550 nm)

Single-mod

e ultra-long

haul (1550

nm)

Connector SFP/LC

Optical fiber

62.5/125 μm

multi-mode

9/125 μm

single-mode

9/125 μm

single-mode

9/125 μm

single-mode

9/125 μm

single-mode

Max.

transmission

segment

0.55 km (0.34

mi)

10 km (6.21

mi)

40 km (24.86

mi)

40 km (24.86

mi)

70 km (43.50

mi)

Central

wavelength

850 nm 1310 nm 1310 nm 1550 nm 1550 nm

Min –9.5 dBm –9 dBm –2 dBm –4 dBm –4 dBm Transmit

ter

optical

power

Max 0 dBm –3 dBm 5 dBm 1 dBm 2 dBm

Receiver

sensitivity

–17 dBm –20 dBm –23 dBm –21 dBm –22 dBm

Operating mode

1000 Mbps

Full duplex

Frame format

Ethernet_II

Ethernet_SNAP

The fiber-optic and electrical connections that a 10/100/1000 Mbps Ethernet interface provides cannot

be used at the same time. If both connections are present, you can configure which connection takes

effect through commands. By default, the electrical connection works.

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