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© 2008 Cisco Systems, Inc. All rights reserved. SMBEN v2.0—7-2
Module Overview
Upon completing this module, you will be able to:
Describe the process of designing an SBCS 1.0 solution
Describe the process of implementing a SCBC network solution
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© 2008 Cisco Systems, Inc. All rights reserved. SMBEN v2.0—7-3
Cisco SBCS Solution Design
Small BusinessCommunication SystemSolution Design
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Lesson Objectives
Upon completing this lesson, you will be able to developa Cisco SBCS network design. This ability includes beingable to meet these objectives:
Articulate SBCS overview, capabilities, topology and components
Describe SNF considerations within the SBCS design
Recall Cisco Unified Communications for SMB customers
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SBCS: The Solution
SBCS is designed for SMB to provide the full range of communication needs:
Voice
Data
Video
Security
Wireless capabilities
SBCS focuses on businesses with as many as 64 users,
some of whom can be located in teleworker home officesor mobile worker locations.
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SBCS Solution Design Capabilities
Cisco SBCS solution provides the following capabilities:
WAN access
LAN switching
Controller-based WLAN roaming connectivity
Integrated security
Call processing
Integrated messaging
GUI-based provisioning using CCA
GUI-based network management using Cisco Monitor Director Agent and Cisco Monitor Director
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SBCS Topology
Main Office LAP521
CE520
FaxUC520
Cable/DSLModem
WLC526
CCA and CiscoMonitor Director
Cisco Monitor Director
Partner Site
Mobile Worker at anypublic place (optional)
Teleworker At HomeOffice (optional)
Cisco871W
PSTN
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SBCS Solution Design Components
Number of Users
Device Access Switch Unified IP phones 500 or 7900 or
IP Communicator
WLAN
1-8 UC520-8U None Up to 10 Integrated* or External AP
9-16 UC520-16U CE520-8PC Up to 18 Integrated* or External AP
17-24 UC520-24U CE520-24PC-K9 Up to 28 External AP
25-32 UC520-36U CE520-24PC-K9 Up to 36 External AP
33-48 UC520-48U CE520-24PC-K9 Up to 48 External AP
RemoteSite
Cisco 871 CE520-8PC** 1-5 of UC520 total Integrated* or External AP
RemotePC
Cisco VPNClient
None 1 of UC520 total — IP Communicator only
Not applicable
* Product Option ** If required
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SBCS Design:Layer 2 and Layer 3 Design
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Layer 2 Design: VLAN Design
WLC526 UC520 CE520
Cisco-Data VLAN 100
Cisco-Voice VLAN 1 Native VLAN for 802.1Q
802.1Q Trunk over physical connection between Switchports
LAP521
Layer 2 LAN
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Layer 2 Design: Trunking and STP
Trunking
– Enables physical connections between devices to carry trafficfrom multiple VLANs
STP – Enables Layer 2 devices to dynamically discover loops in the
network and to block them
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Layer 2 Design: SmartPort Roles
Cisco-verified feature templates that configure the followingwith minimal effort and expertise:
– Switching
– Security
–PoE for IP phones and wireless APs
– QoS
Selected from a drop-down menu in GUI-based provisioningapplication
Reflects the type of device to be connected
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Layer 2 Design:Recommended SmartPort Role Assignments
Device Port Type and Number RecommendedPort Role
Recommended DeviceConnection
UC520 8-port internal switch:FastEthernet port 1/0 to 1/7
IP phone + desktop IP phone/desktop
AP AP-521/LAP-521
AP WLC-526
Expansion Port: FastEthernet 1/8 Switch WS-CE520 series of switch
WAN Port: FastEthernet 0/0 Cannot be changed LAN port of DSL /cable modem
WS-CE520-24PC
FastEthernet 1 to 24 IP phone + desktop IP phone/desktop
AP AP-521/LAP-521
AP WLC-526
Expansion Slots:Gigabit Ethernet 1 to 2
Switch UC520 or another WS-CE520 switch
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Layer 2 Design: PoE
Power over Ethernet:
Offers 48-volt DC power over standard Ethernet cable
Enables Cisco Unified IP phones and other devices to obtainpower
Ensures operational devices remain online during power failuresituations
Is supported by the CE520 and UC520 switches
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Layer 3 Design
Provides the capabilities necessary to forward traffic betweenLayer 3 segments, or VLANS
General Layer 3 design considerations:
– IP addressing
–DNS
– NAT
– IP routing
– NTP
Layer 3 considerations specific to unified communicationsdeployments:
– TFTP
– DHCP
– QoS
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Layer 3 Design: TFTP and DHCP
DHCP provides IP addresses to client devices dynamically
TFTP is a simplified version of FTP
IP phones rely on a TFTP server to acquire configuration information
LaptopIP phone UC520 DHCP
server
TFTPserver
Data VLAN scope
Voice VLAN scope
Phone configurationand software
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Layer 3 Design: QoS Definition
QoS:
Provides improved service to selected network traffic over technologies such as:
– Frame Relay
–MLPS
– Ethernet
QoS processing provides:
– Dedicated bandwidth support
–Improved traffic-loss characteristics
– Network congestion avoidance and management techniques
– Traffic shaping
– Traffic prioritization
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Layer 3 Design: LAN QoS
QoS in the LAN is configured:
Through SmartPort roles
When templates are assigned to switch ports, which:
– Map CoS (Layer 2) and DSCP (Layer 3) values to queues
–Set round-robin queuing allocations for switch ports
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Layer 3 Design: WAN QoS
Different connection speeds between switch ports and WAN connections:
Create traffic processing problems
Cause congestion of the WAN interface
Create problems with routing and VoIP
Do not create congestion issues with traffic sent from WAN to LAN
Monitor Director
Main Office
Cisco IPphone
Windowsserver
CatalystExpress
Mobile Worker
Partner Site
Monitor Director
IP phone800 ISR
Home Office
UC520 withCommunication
Manager ExpressUnity Express
PSTN
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SBCS Design: Cisco Unified Communications
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Cisco Unified Communications: Features
Call-coverage features: Call waiting
Call forwarding
Call-handling features: Call hold
Call transfer
Conferencing
IP phone features: Speed dials
Intercom
Call hunt
Call pickup
Call park
Call blocking
Paging
Music-on-hold (MOH)
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Cisco Unified Communications:Remote IP Phones
Remote IP Phone withG.711 codec
(transcoding support)(for low bandwidth remote
workers)Mobile worker with
Softphone
No E911Support
Cisco871W
Home Office
MainOffice
UC520
VPN Tunnel
VPN Tunnel
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Cisco Unified Communications: Dial Plan
Instructs the UC520 to route calls appropriately
Designed to perform:
– Endpoint addressing
– Path selection
–Call privileges
– Digit manipulation
Three deployment methods:
– PBX model
–Keyswitch model
– Hybrid (PBX+Keyswitch) model
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Cisco Unified Communications:Analog Devices
UC520 and analog devices:
Four analog telephony ports (FXS) are provided in the8 to16-user model
Optional: VIC slot of the 32 to 64 user model
Analog devices connected to FSX ports do not count againstthe maximum number of IP endpoints supported
Limit of four analog devices
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Cisco Unified Communications:Voice Gateway Overview
PSTN
PSTN-to-VoIPcallConference
call
IP phones inSBCS network
DSP resources inthe UC520
Analog/digital interface(FXO, BRI, T1/E1 PRI)Transcoding for
remote(G.729 to/from
G.711)
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Voice Gateway: Telephony Interfaces
Types of telephony interfaces:
Analog – FXS, FXO, analog DID, E&M, and CAMA
– FXO and analog DID are used to connect to the PSTN
– FXS are used for connecting fax machines and analog phones
Digital –
BRI, T1 CAS, E1R2, and T1/E1 PRI
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Voice Gateway: Benefits of SIP Trunking
SIP-based VoIP equivalent of the analog or digital trunks fromtraditional PSTN
Service provider for a SIP trunk provides:
– Basic connectivity
–Emergency services
– Dial plan management
– Operator services
– Long-distance services
–
Optional local number portability – Optional call features
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Lesson Summary
The Cisco SBCS is designed for SMBs to provide voice, data,video, security, and wireless capabilities—while integrating withexisting applications.
Layer 2 and Layer 3 designs provide system management toolsfor SMBs using SBCS.
Cisco Unified Communications offers several features available inthe categories of call coverage, call handling, and IP phone.
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