SpectraLink NetLink SVP100 Quick guide

NetLink SVP Server
SVP100
Installation, Configuration and Administration
Within NetLink Telephony Gateway environments
PN 72-0178-02
Issue E

SpectraLink Corporation Installation, Configuration, and Administration
NetLink SVP Server (within NetLink Telephony Gateway environments)
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Notice
SpectraLink Corporation has prepared this document for use by SpectraLink personnel and customers. The
drawings and specifications contained herein are the property of SpectraLink and shall be neither reproduced in
whole or in part without the prior written approval of SpectraLink, nor be implied to grant any license to make,
use, or sell equipment manufactured in accordance herewith.
SpectraLink reserves the right to make changes in specifications and other information contained in this
document without prior notice, and the reader should in all cases consult SpectraLink to determine whether
any such changes have been made.
The terms and conditions governing the sale of SpectraLink hardware products and the licensing of
SpectraLink software consist solely of those set forth in the written contracts between SpectraLink and its
customers. No representation or other affirmation of fact contained in this document including but not limited
to statements regarding capacity, response-time performance, suitability for use, or performance of products
described herein shall be deemed to be a warranty by SpectraLink for any purpose, or give rise to any liability of
SpectraLink whatsoever.
In no event shall SpectraLink be liable for any incidental, indirect, special, or consequential damages
whatsoever (including but not limited to lost profits) arising out of or related to this document, or the
information contained in it, even if SpectraLink has been advised, knew, or should have known of the
possibility of such damages.
Trademark Information
SpectraLink®
LinkPlus
Link
NetLink
SVP
Are trademarks and registered trademarks of SpectraLink Corporation.
The SpectraLink logo is a registered trademark in the United States of America and in other countries.
All other trademarks used herein are the property of their respective owners.
SpectraLink Corporation
5755 Central Avenue
Boulder, CO 80301
303 440 5330 or
800 676 5465
www.spectralink.com
Copyright © 2001 to 2007 SpectraLink Corporation. All rights reserved
Information in this document is subject to change without notice and does not represent a commitment on the
part of SpectraLink Corporation. The software described in this document is furnished under a license and
may only be used pursuant to the terms of (1) SpectraLink's software license agreement available at
http://www.spectralink.com/softwareUpdates OR (2) the terms and conditions previously agreed to in writing
between the user and SpectraLink Corporation OR (3) the terms and conditions previously agreed to in writing
between the user and an authorized SpectraLink reseller (each, the “Agreement”). The software may be used
only in accordance with the terms of the Agreement. No part of this manual, or the software described herein,
may be reproduced or transmitted in any form or by any means, electronic or mechanical, including
photocopying and recording, for any purpose except for the sole intent to operate the product or without the
express written permission of SpectraLink Corporation.

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IMPORTANT SAFETY INFORMATION
Follow these general precautions while installing telephone equipment:
•Never install telephone wiring during a lightning storm.
•Never install telephone jacks in wet locations unless the jack is specifically designed for
wet locations.
•Never touch uninsulated telephone wires or terminals unless the telephone line has
been disconnected at the network interface.
•Use caution when installing or modifying telephone lines
Please visit spectralink.com to view regulatory declarations.

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Table of Contents
1. About This Document 5
1.1 SpectraLink Corporation Model Numbers 5
1.2 Related Documents 5
1.3 Customer Support Hotline 5
1.4 Icons and Conventions 5
2. NetLink SVP Server Overview 6
2.1 SpectraLink Voice Priority (SVP) 6
2.2 Multiple SVP Servers 6
2.3 The Timing Function 6
2.4 NetLink SVP Server Capacity 7
2.5 Notes on System Configuration 8
2.6 System Diagram 9
2.7 System Components 10
2.8 The Front Panel of the NetLink SVP Server 12
3. Installing the NetLink SVP Server 13
3.1 Required Materials 13
3.2 Locate the NetLink SVP Server 13
3.3 Install the NetLink SVP Server 13
4. Configuring the NetLink SVP Server 15
4.1 Connecting to the NetLink SVP Server 15
4.2 The NetLink SVP-II System Menu 16
4.3 Network Configuration 17
4.4 SVP Server Configuration 20
4.5 Change Password 23
5. Swapping/Adding/Deleting SVP Servers 24
6. Software Maintenance 25
7. Troubleshooting via System Status Menu 26
7.1 Error Status 27
7.2 Network Status 28
7.3 Software Version 30

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1. About This Document
This document explains how to configure and maintain one or more NetLink SVP
Servers within the NetLink Gateway telephony system.
1.1 SpectraLink Corporation Model Numbers
This document covers the following registered model number:
SVP100
1.2 Related Documents
NetLink Telephony Gateway : Installation, Configuration, and Administration
(72-0065-02)
Available at http://www.spectralink.com/resources/manuals.jsp.
NetLink Wireless Telephone: Configuration and Administration (72-1065-09)
Available at http://www.spectralink.com/resources/manuals.jsp.
NetLink Wireless Telephone WLAN Compatibility List (72-9000-00)
Access Point Configuration Note (72-99xx-00 where xx indicates a number
corresponding to the type of access point.). Available at
http://www.spectralink.com/resources/wifi_compatibility.jsp.
Deploying NetLink Wireless Telephones: Best Practices white paper. Available at
http://www.spectralink.com/resources/white_papers.jsp.
1.3 Customer Support Hotline
SpectraLink wants you to have a successful installation. If you have questions please
contact the Customer Support Hotline at [phone]. The hotline is open
Monday through Friday, 6 a.m. to 6 p.m. Mountain time.
1.4 Icons and Conventions
This manual uses the following icons and conventions.
Caution! Follow these instructions carefully to avoid danger.
Note these instructions carefully.
NORM This typeface indicates a key, label, or button on the NetLink SVP Server.

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2. NetLink SVP Server Overview
The NetLink SVP Server is an Ethernet LAN device that works with APs to provide
QoS on the wireless LAN. Voice packets to and from the NetLink Wireless
Telephones are intercepted by the NetLink SVP Server and encapsulated for
prioritization as they are routed to and from the NetLink Telephony Gateway.
One or more NetLink SVP Servers are required in systems with five or more
NetLink Telephony Gateways. In systems with four or fewer NetLink Telephony
Gateways, the NetLink SVP Server is not required because SVP is handled within
the NetLink Telephony Gateway(s).
2.1 SpectraLink Voice Priority (SVP) and Quality of Service
SpectraLink Voice Priority (SVP) is the SpectraLink quality of service (QoS)
mechanism that is implemented in the wireless telephone and AP to enhance voice
quality over the wireless network. SVP gives preference to voice packets over data
packets on the wireless medium, increasing the probability that all voice packets are
transmitted efficiently and with minimum delay. SVP is fully compatible with the
IEEE 802.11b standard.
NetLink Wireless Telephones support basic WMM (Wi-Fi Multimedia) if also
supported by the AP as part of the 802.11e protocol. If the AP supports WMM, the
wireless telephone automatically discovers and uses it. WMM does not replace the
NetLink SVP Server.
2.2 Multiple SVP Servers
Multiple SVP Server environments are those which have more than one NetLink
SVP Server. Up to 16 SVP Servers may be installed in any one subnet.
2.3 The Timing Function
In the NetLink Gateway environment, SVP Servers provide the "timing" function
for active calls. In multiple SVP Server environments, the active calls are distributed
across the SVP Servers.
The number of active SVP Servers is determined dynamically. Whenever SVP
Servers are added to or removed from the system, the distribution of the "timing"
function for active calls is affected.
The addition of an SVP Server is detected as soon as the new SVP Server is up and
running. The new SVP Server will immediately start providing the “timing” function
for the appropriate wireless telephones. The user should not detect any change. The
removal of an SVP Server is detected within one minute. During this time, any
wireless telephone that was using the SVP Server that was removed will be affected.
If the wireless telephone was not in a call, it may lose contact with its Gateway,
resulting in a check-out/check-in sequence. If the wireless telephone was in a call,
the audio will be lost and the call will be dropped.

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2.4 NetLink SVP Server Capacity
The table below shows the capacity of NetLink Telephony Gateways in a multiple
SVP Server environment. The table shows the total possible calls at 100% active
calls. However, since it is unlikely that all handsets will be in use at the same time, the
table then analyzes the number of handsets that could be installed in any given
system where 15%, 25% or 50% of the handsets are in active calls at any one time.
The calculations are not linear due to the Erlang1calculation for telephony traffic.
The possible installed handsets figures are approximate and meant as a guideline and
not as an absolute recommendation for any facility.
Possible installed handsets
Number of
SVP
Servers
Number of
calls
possible
per Server
Total possible
installed
handsets
@
100% in
active calls
Number of
NetLink
Telephony
Gateways
required
Erlang @
15% in
active
calls
@
25% in
active
calls
@
50% in
active
calls
1 120 120 15 103 240 240 206
2 120 240 30 219 480 480 438
3 120 320240 336 640 640 640
1An Erlang is a unit of telecommunications traffic measurement. Strictly speaking, an Erlang represents the continuous use of one voice
path. In practice, it is used to describe the total traffic volume of one hour.
Erlang traffic measurements are made in order to help telecommunications network designers understand traffic patterns within their voice
networks. This is essential if they are to successfully design their network topology and establish the necessary trunk group sizes.
Erlang traffic measurements or estimates can be used to work out how many lines are required between a telephone system and a central
office (PSTN exchange lines), or between multiple network locations.
Please visit www.erlang.com for additional information.
2Limited by the eight simultaneous calls supported by each NetLink Telephony Gateway.

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2.5 Notes on System Configuration
Wireless telephones cannot roam with uninterrupted service between
subnets unless specific LAN components are present. Certain
AP/Ethernet switch combinations establish a layer-2 tunnel across subnets
that enables the handsets to roam. Without this capability, any call in
progress will be dropped when the user moves out of range and the
handset must be power cycled in order to resume functionality in the new
subnet area.
Please see Deploying NetLink Wireless Telephones: Best Practices for
detailed configuration information when installing multiple SVP Server
models across several different subnets.
Subnets are not recommended in NetLink Telephony Gateway
environments.
IP multicast addresses are used when NetLink i640 and 8030 Wireless
Telephones are installed. This requires that multicasting be enabled on the
subnet used for the NetLink wireless telephones, SVP Server, and
Telephony Gateways.
Routers are typically configured with filters to prevent multicast traffic
from flowing outside of specific domains. The wireless LAN can be placed
on a separate VLAN or subnet to reduce the effects of broadcast and
multicast traffic from devices in other network segments.
The NetLink SVP Server requires a Cat. 5 cable connection between its
network port and the Ethernet switch. The NetLink SVP Server auto-
negotiates to the type of port on the Ethernet switch and supports 10Base-
T, 100Base-T, full-duplex and half-duplex port types.

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2.6 System Diagram
The following diagram shows one NetLink SVP Server residing on a network with
five NetLink Telephony Gateways, wireless LAN APs, and Ethernet switch:
(NetLink Telephony Gateway system example)
NetLink SVP Server
Ethernet Switch
access
p
oint
Wireless
POS
wireless
telephones
access
p
oint
desksets
optional
PBX
NetLink Telephony
Gateway
NetLink Telephony
Gateway
NetLink Telephony
Gateway
NetLink Telephony
Gateway
NetLink Telephony
Gateway
Device supplied by
SpectraLink
CAT 5 cable
25 pair cable
Multiple phone cables
Phone cable
Administrative
computer
Demarc block

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2.7 System Components
NetLink e340/h340/i640 and 8000 Series Wireless Telephones
Employees can carry wireless telephones to make and receive calls as they move
throughout the building. The wireless telephones are to be used on-premises; they
are not cellular or satellite phones. They are connected to the facility's existing
telephone system and to the NetLink Telephony Gateway. Just like wired telephones,
they can receive calls directly, receive transferred calls, transfer calls to other
extensions, and make outside and long distance calls (subject to the restrictions
applied in your facility.)
NetLink Telephony Gateway
The NetLink Telephony Gateway serves as the connecting point, or gateway,
between the LAN and the existing telephone system. One or more NetLink
Telephony Gateways are typically installed in the telephone equipment room. Each
NetLink Telephony Gateway supports up to 16 telephone lines and wireless
telephones. Up to 40 NetLink Telephony Gateways can be connected to the LAN to
support additional telephone lines. If five or more NetLink Telephony Gateways are
connected to the LAN, a NetLink SVP Server must be installed to handle the
increased call volume.
SpectraLink offers digital NetLink Telephony Gateways that work with the digital
ports on most common brands of telephone systems (PBX or key systems). We also
offer an analog NetLink Telephony Gateway that works with telephone systems
(CO, PBX, or Key Systems) with analog (loop start) ports.
Access Points
APs are supplied by third party vendors. They provide the connection between the
wired Ethernet LAN and the wireless (802.11) LAN. APs must be positioned in all
areas where wireless telephones will be used. The number and placement of APs will
affect the coverage area and capacity of the wireless system. Typically, the
requirements for use of NetLink Wireless Telephones are similar to those of wireless
data devices. Contact SpectraLink, or a certified SpectraLink distributor, for specific
information about your facility’s needs.
The NetLink system must connect to APs that utilize SVP. Contact SpectraLink, or a
certified SpectraLink distributor, to verify that your AP and its software version are
supported.
Ethernet switch:
Ethernet switches interconnect multiple network devices, including APs and
NetLink Telephony Gateways. Ethernet switches are required to provide the higher
performance network connections needed to handle combined voice and data traffic.
Router
The router is an optional component in the wired Ethernet LAN infrastructure that
separates a wired LAN into segments so that network traffic is restricted to those
segments that are directly involved in the communication. Installation of a network
router is recommended in larger networks, where there may be significant network
traffic not related to the wireless LAN. A router will isolate the wireless LAN from

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the associated wired LAN so that they are not impacted by each others’ traffic. The
NetLink Telephony Gateways, the APs, and their associated Ethernet switch must all
be on the same “side” of the router.
NetLink SVP Server
The NetLink SVP Server manages call network traffic. It is required in any system
when five or more NetLink Telephony Gateways are connected to the LAN.
Administrative computer
An administrative computer is required for setup and maintenance of the NetLink
Telephony Gateway and the NetLink SVP Server. This computer may be temporarily
connected directly to the component or to the network; a dedicated computer is not
required. Some installations use a laptop to configure and maintain system
components.

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2.8 The Front Panel of the NetLink SVP Server
The NetLink SVP Server’s front panel contains ports to connect to power, the LAN,
and to an administrative computer via an RS-232 port. Status LEDs supply
information about the NetLink SVP Server’s functioning.
RS-232 Port: male DB-9 connector (DTE) used for RS-232 connection to a
terminal, terminal emulator, or modem for system administration.
LEDs:
LNKOK: Lit when there is a network connection.
ACT: Lit if there is system activity.
COL: Lit if there are network collisions.
NETWORK: Connects to wired (Ethernet) LAN.
ERROR: Lit when the system has detected an error.
STATUS: Indicate system error messages and status.
1: Heartbeat, indicates gateway is running.
2: If active calls.
3, 4, 5: Currently unused
PWR (power jack): Connects to the AC adapter supplying power to the system.
Use only the SpectraLink-provided Class II AC Adapter with output
24VDC, 1A.
L
N
K
O
K
A
C
T
C
O
L
Status
E
R
R
O
R
34 51 2 PWR
NETWORK
RS-232

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3. Installing the NetLink SVP Server
As shown in the system diagram the NetLink SVP Server is connected to the
Ethernet switch. The specifications covered here allow for great flexibility in physical
placement of the components within stated guidelines.
3.1 Required Materials
The following equipment must be provided by the customer.
•Power Outlet –AC adapter provided by SpectraLink..
•Backboard space – The NetLink SVP Server is designed to be wall- mounted
to ¾" plywood securely screwed to the wall.
•Screws – Required to mount the NetLink SVP Server to the wall. Four #8
¾" panhead wood screws (or similar device) are required.
•Cat. 5 Cable – RJ-45 connector at the NetLink SVP Server. Connection to
Ethernet switch.
3.2 Locate the NetLink SVP Server
The NetLink SVP Server measures approximately 4 x 12.5 x 7 inches, and weighs
about five pounds. The unit can be wall mounted, vertically or horizontally, over ¾"
plywood. The SVP Server can also be rack mounted using a rack mount kit (sold
separately).
Locate the NetLink SVP Server in a space with:
•Sufficient backboard mounting space (for wall mount) and proximity to the
LAN access device (switched Ethernet hub) and power source.
•Easy access to the front panel, which is used for cabling.
•A maximum distance of 325 feet (100 meters) from the Ethernet switch.
3.3 Install the NetLink SVP Server
The NetLink SVP Server may be mounted on a rack or to a wall.
Mount the SVP Server on a rack
The rack mount kit is designed for mounting equipment in a standard 19” rack and
should contain the following equipment:
•Mounting plates– two for each SVP Server to be mounted.
•Screws– four rack mount screws for each SVP Server to be mounted.
To rack-mount the NetLink SVP Server:
1. Remove the corner screws from the SVP Server
2. Screw the U-shaped end (round screw holes) of the two mounting plates to the
SVP Server.
3. Screw the other end of the two mounting plates (oblong screw holes) to the rack.

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4. Repeat steps 1-3 for each additional SVP Server. The mounting plate is designed
to provide the correct minimum spacing between units. When mounting multiple
units, stack the units in the rack as closely as possible.
Mount the NetLink SVP Server to a wall
The NetLink SVP Server can be mounted either horizontally or vertically.
To mount the NetLink SVP Server:
1. Using a 1/8-inch drill bit, drill four pilot holes, on 1.84-inch by 12.1-inch centers
(approximately equivalent to 1-13/16” by 12-1/8”).
2. Insert the #8 3/4-inch screws in the pilot holes and tighten, leaving a 1/8-inch
to 1/4-inch-gap from the wall.
Connect NetLink SVP Server to LAN
Using a Cat. 5 cable, connect the NETWORK port on the NetLink SVP Server to the
connecting port on the Ethernet switch.
Connect Power
1. Connect the power plug from the AC adapter to the jack labeled PWR on the
NetLink SVP Server.
Use only the provided Class II AC Adapter with output 24VDC, 1A.
2. Plug the AC adapter into an 110VAC outlet to apply power to the NetLink SVP
Server.
3. The system will cycle through diagnostic testing and the LEDs will blink for
about one minute. When the system is ready for use:
•The ERROR LED should be off.
•Status 1 should be blinking.

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4. Configuring the NetLink SVP Server
During initial setup of the NetLink SVP Server the IP address is established and the
maximum number of active calls per AP is set. Optionally, you may enter a
hostname and a location for software updates via TFTP.
4.1 Connecting to the NetLink SVP Server
The initial connection to the NetLink SVP Server must be made via a serial
connection to establish the NetLink SVP Server’s IP address. After the IP address is
established, connection to the NetLink SVP Server may be done via the network
using Telnet. It is recommended that the basic setup actions occur while the serial
connection is made.
Connect via the Serial Port
1. Using a DB-9 female, null-modem cable, connect the NetLink SVP Server to the
serial port of a terminal or PC.
2. Run a terminal emulation program (such as HyperTerminal™) or use a VT-100
terminal with the following configuration:
Bits per second: 9600
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
3. Press Enter to display the NetLink SVP Server login screen.
4. Enter the default login: admin and default password: admin. These are case
sensitive.
5. The NetLink SVP-II System menu will display.
Connecting Via Telnet
Telnet can only be used after the NetLink SVP Server’s IP address is
configured.
The Telnet method of connection is used for routine maintenance of the NetLink
Server for both local and remote administration, depending on your network.
To connect via Telnet, run a Telnet session to the IP address of the NetLink SVP
Server. Once you connect and log in, the NetLink SVP-II System menu displays.

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4.2 The NetLink SVP-II System Menu
The main menu displays as shown here:
System Status—menu for viewing error messages, status of operation and software
code version.
SVP-II3Configuration—allows you to set the mode and reset the system.
Network Configuration—allows you to set network configuration options, including
IP address and hostname.
Change Password—allows you to change the password for NetLink SVP Server
access.
3SVP-II is a designation used internally by SpectraLink Engineering.

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4.3 Network Configuration
The IP address and other network settings are established via the Network
Configuration screen. This is also where you may optionally establish a hostname and
enter the IP address of the location of any software updates you may obtain from
SpectraLink. See section 5, the Software Maintenance section, of this document for
more information about installing software updates via TFTP.
Scroll to Network Configuration and select by pressing Enter. A screen similar to the
following appears:
Note the navigation options at the bottom of the screen. Press Enter to change a
value, ESC to exit the screen, and the arrow keys to move the cursor.
SendAll
In a system with multiple NetLink SVP Servers, the SendAll option is provided to
speed configuration and to ensure identical settings. The S=SendAll option allows
you to send that configuration parameter to every NetLink SVP Server on the LAN.
SendAll can only be used after the IP address is established on EACH NetLink SVP
Server via the serial connection. If you anticipate identical settings across the LAN,
set just the IP address and custom hostname (if desired) for each NetLink SVP
Server using the initial serial connection. Then connect via the LAN and use SendAll
to set identical configuration options for all NetLink SVP Servers.
If SendAll is to be utilized in your system, all passwords must be identical. DO NOT
CHANGE THE PASSWORD AT THE INITIAL CONFIGURATION IF THE
SendAll OPTION IS DESIRED. Use the default password and change it globally if
desired after a LAN connection is established for all NetLink SVP Servers.
If independent administration of each NetLink SVP Server is desired, the passwords
may be set at initial configuration.

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The following options must be configured:
IP Address
Enter the IP address of the NetLink SVP Server, defined by your network
administrator. Enter the complete address including digits and periods. DHCP
may be entered.
The NetLink SVP Server will automatically lock for maintenance if the IP
address is changed. When this Maintenance Lock occurs, the NetLink SVP
Server must be reset upon exit. All active calls are terminated during a reset.
Hostname
(Optional) The name of the NetLink SVP Server to which you are connected,
for identification purposes only. You cannot enter spaces in this field. Change
the default host name, if desired.
Subnet Mask
The network administrator must define the subnet mask.
Default Gateway
The IP address of a router on the local subnet.
SVP-II TFTP Download Master
This entry indicates the source of software updates for the NetLink SVP Server.
See section 5, the Software Maintenance section, for more information.Valid
source location entries are:
•NONE: disables.
•IP Address: The IP address of a network TFTP server that will be used to
transfer software updates to the NetLink SVP Server.
DNS server and DNS domain
These settings are used to configure Domain Name services. Consult your
system administrator for the correct settings. These can also be set to DHCP. This
will cause the DHCP client in the NetLink SVP Server to attempt to
automatically get the correct setting from the DHCP server. The DHCP setting
is only valid when the IP address is also acquired using DHCP.
WINS servers
These setting are used for Windows Name Services. Consult your system
administrator for the correct settings. These can also be set to DHCP. This will
cause the DHCP client in the NetLink SVP Server to attempt to automatically
get the correct setting from the DHCP server. The DHCP setting is only valid
when the IP address is also acquired using DHCP.
When the name services are set up correctly, the NetLink SVP Server can
translate hostnames to IP addresses. Using Telnet, it is also possible to
access the NetLink SVP Server using its hostname instead of the IP
address.
Workgroup
As set in WINS.

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Syslog Server
Logging can be set to Syslog or NONE. If Syslog is set, a message is sent to the
syslog server when an alarm is triggered.
Disable Telnet Service
Prevents Telnet access into the SVP Server. Reset the SVP Server for the
change to take effect. Upon reset the Telnet protocol server is not started.
The NetLink SVP Server must be reset in order to set the configuration options. If
the NetLink SVP Server is in Maintenance Lock, you must manually reset it by
selecting the Reset option in the SVP-II Configuration screen and then pressing Y
upon exit.

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4.4 SVP Server Configuration
The SVP-II Configuration screen is where you set the mode of the NetLink SVP
Server. It is also where you can lock the NetLink SVP Server for maintenance and
reset the NetLink SVP Server after maintenance. The type of gateway you are using
determines the mode of the NetLink SVP Server. SVP-II Mode must be set to
NetLink for systems using the SpectraLink NetLink Telephony Gateway.
From the main menu, scroll to SVP-II Configuration and select by pressing Enter.
The NetLink SVP Server will automatically lock for maintenance if the IP address is
changed. When this Maintenance Lock occurs, the NetLink SVP Server must be
reset upon exit. All active calls are terminated during a reset.
SVP-II Mode
Set to NetLink when using a NetLink Telephony Gateway.
Ethernet link
The SVP Server will auto-negotiate unless there is a need to specify a link speed.
System Locked
This option is used to take the system down for maintenance. The default entry
is N(No). Set it at Y(Yes) to prevent any new calls from starting. Return to Nto
restore normal operation.
Maintenance Lock
The system automatically sets this option to Y(Yes) after certain maintenance
activities that require reset, such as changing the IP address. Maintenance Lock
prevents any new calls from starting. Note that the administrator cannot change
this option. It is automatically set by the system. Reset the system at exit to clear
Maintenance Lock.