Cisco Small Business SRP500 Series Services Ready Platforms

SRP500 Series Services Ready Platforms Data Sheet

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Flexible, Cost-Effective Customer Premises Equipment for Small Business

Demand for managed services continues to show strong growth, with small businesses - those with fewer than 100 employees - expected to make up more than half of this market opportunity. These companies may have complex IT needs, but generally don't have the technical staff or expertise needed to keep up. They look to service providers for a flexible infrastructure and simplified management, along with better quality and reliability than they can achieve in-house. To meet this opportunity, service providers are transforming their networks using services-ready platforms to deliver an array of profitable IP-based communications services.
Cisco ® SRP500 Series Services Ready Platforms are flexible, cost-effective fixed-configuration access routers, designed specifically to meet the needs of small business customers. Embedded intelligence enables service providers to create, provision, and deploy premium revenue-generating services - such as high-quality IP voice, data, security, and wireless - to customers on an as-needed basis. These platforms will help enable service providers to deliver differentiated, converged service offers that increase bandwidth usage and average revenue per user while reducing customer churn.

Product Overview

The Cisco SRP500 Series Services Ready Platforms include:

• Embedded intelligence to support a variety of high-quality voice, data, security, and wireless services.

• Integrated voice ports powered by an industry-leading Session Initiation Protocol (SIP) stack that delivers clear, high-quality voice service.

• Integrated stateful packet inspection (SPI) firewall protects against unauthorized access.

• High-speed IP Security (IPsec) with Triple Data Encryption Standard (3DES) VPN features allow secure remote access for mobile workers or protected site to site communication across the Internet.

• 4-port managed Ethernet switch to connect devices in the office. VLAN support allows for secure segmentation of network resources.

• Integrated 802.11n wireless access point to enable employees to connect to the network while away from their desks.

• Guest Network access provides visitors to the customer's site with controlled wireless access to the Internet, whilst ensuring that business data systems are kept safely out of reach.

• Drivers for supported 3rd and 4th generation mobile data network USB modems, allowing diverse routing and connection backup options.

• Interoperability with industry-leading soft switches and voice gateways to enable scalable, end-to-end multiservice network deployments.

• Support for industry-standard TR-069 and XML-based provisioning for zero-touch deployments.

• Easy integration with other Cisco Small Business products to enable adaptability as customer needs change.

Figure 1 shows the Cisco SRP521W-U Services Ready Platform. Figure 2 shows the SRP546W Services Ready Platform.

Figure 1. Cisco SRP521W Services Ready Platform

Figure 2. Cisco SRP546W Services Ready Platform

Table 1 lists details of all models in the Cisco SRP500 Series.

Table 1. Cisco SRP500 Series models



Mobile Data



Voice Ports

USB 2.0 Ports

Cisco SRP521W-U

10/100 Mbps Fast Ethernet

Wireless data using supported USB modem (not included)

4-port 10/100 Mbps Fast Ethernet managed switch


Single captive antenna

2 FXS,
1 FXO (relay)


Cisco SRP526W-U

Asymmetric DSL (ADSL) 2+ Annex B

Wireless data using supported USB modem (not included)

4-port 10/100 Mbps Fast Ethernet managed switch


Single captive antenna

2 FXS,
1 FXO (relay)


Cisco SRP527W-U

Asymmetric DSL (ADSL) 2+ Annex A/M

Wireless data using supported USB modem (not included)

4-port 10/100 Mbps Fast Ethernet managed switch


Single captive antenna

2 FXS,
1 FXO (relay)


Cisco SRP541W

2 x 10/100/1000 Mbps Gigabit Ethernet

Wireless data using supported USB modem (not included)

4-port 10/100/1000 Mbps Gigabit Ethernet managed switch


Dual TNC antennas

4 FXS,
1 FXO (active)


Cisco SRP546W

ADSL 2+ Annex B, 10/100/1000 Mbps Gigabit Ethernet

Wireless data using supported USB modem (not included)

4-port 10/100/1000 Mbps Gigabit Ethernet managed switch


Dual TNC antennas

4 FXS,
1 FXO (active)


Cisco SRP547W

ADSL 2+ Annex A/M, 10/100/1000 Mbps Gigabit Ethernet

Wireless data using supported USB modem (not included)

4-port 10/100/1000 Mbps Gigabit Ethernet managed switch


Dual TNC antennas

4 FXS,
1 FXO (active)



The Cisco SRP500 Series Services Ready Platforms contain embedded application intelligence to enable service providers to add and/or remove services remotely, depending upon end customer requirements, without hardware upgrades or costly truck rolls. Figure 3 illustrates some of these applications.

Figure 3. Example deployment options

Features and Benefits

Cisco SRP500 Series Services Ready Platforms are flexible, cost-effective CPE devices for small businesses that meet the needs of service providers through:

Embedded intelligence to support concurrent, premium revenue-generating services such as voice, data, and security. Service providers can easily create and provision a variety of service offerings, adding or removing them remotely as their customers' needs change

Industry-leading SIP stack that delivers an advanced SIP implementation that ensures swift network integration to provide customers with high quality, reliable voice services

Interoperability with industry-leading soft switches, and voice gateways that enable service providers to deploy highly efficient, scalable end-to-end multiservice networks

Standards-based provisioning, with support for TR-069 and XML, that reduces operating expenses by enabling near zero touch deployments, eliminating the need for highly skilled technicians and costly truck rolls to deploy new services

Compact design that integrates voice, data, switching, wireless, and security in a desktop device that is ideal for simple, space-saving small business deployments

Competitive pricing with support for premium services that reduces capital expenses, warehousing costs, and the need for complete equipment upgrades when service requirements change

Product Specifications

Table 2 lists the software features of the Cisco SRP500 Series, Table 3 gives the voice features, and Table 4 describes the wireless features.

Table 2. Software Features of the Cisco SRP500 Series




• Static routing
• Routing Information Protocol (RIP) versions 1 and 2
• Generic routing encapsulation (GRE)
• Point-to-Point Tunneling Protocol (PPTP) -- supported on primary Ethernet WAN interface
• Layer 2 Tunneling Protocol (L2TP) -- supported on primary Ethernet WAN interface
• Policy-based routing

Data features

• 802.3u Fast Ethernet (520 models), 802.3ad Gigabit Ethernet (540 models)
• IPv4 (RFC 791)
• Address Resolution Protocol (ARP) (RFC 826)
• DNS client A record (RFC 1706), SRV record (RFC 2782)
• Dynamic Host Configuration Protocol (DHCP) client (RFC 2131)
• DHCP server (RFC 2131)
• Point-to-Point Protocol over Ethernet (PPPoE) client (RFC 2516)
• Internet Control Message Protocol (ICMP) (RFC 792)
• Transmission Control Protocol (TCP) (RFC 793)
• User Datagram Protocol (UDP) (RFC 768)
• Real-Time Transport Protocol (RTP) (RFC 1889, RFC 1890)
• Real-Time Control Protocol (RTCP) (RFC 1889)
• Trivial File Transfer Protocol (TFTP)
• Real-Time Streaming Protocol (RTSP)
• HTTP (RFC 2616) and HTTPS (RFC 2818)
• Network Address Translation (NAT) (RFC 1631) with flexible configuration for translating local addresses.
• SIP, RTSP, NetMeeting, IRC NAT Application Layer Gateways
• DiffServe Code Point (DSCP) (RFC 2474)
• Type of service (ToS) (RFC 791, RFC 1349)
• Network Time Protocol client (NTP)
• Router or bridge mode of operation
• MAC address cloning
• Port forwarding
• Internet Group Management Protocol (IGMP) versions 1 and 2
• IGMP Snooping (SRP500 models only)
• Universal Plug and Play (UPnP)
• Dynamic Domain Name System (DDNS)
• DNS proxy
• DNS spoofing
• Access control lists (ACLs) for inbound traffic

Switch features

• Automatic medium dependent interface (MDI) and MDI crossover (MDI-X)
• Up to 5 802.1q VLANs (SRP520 models)
• Up to 10 802.1q VLANs (SRP540 models)
• Storm control
• 802.1d Spanning Tree protocol

DSL (DSL models only)

• ATM Variable Bit Rate/real-time (VBR-rt), ATM Unspecified Bit Rate (UBR), Constant Bit Rate (CBR), and Variable Bit Rate/non-real-time (VBR-nrt)
• Up to four permanent virtual circuits (PVC)
• ATM operation, administration, and maintenance (OAM) support for F4 and F5 continuity check with segment or end-to-end loopback
• IP over ATM (IPoA)
• Point-to-Point Protocol over ATM (PPPoA)
• PPP over Ethernet (PPPoE)
• Bridged Ethernet over ATM (EoA) (RFC 1483/RFC2684)

Security features

• Stateful inspection routing firewall
• Denial-of-service (DoS) prevention
• Internet access control by MAC and IP address
• Secure HTTP (HTTPS) support for remote access and provisioning
• Client certificates for secure remote provisioning
• Multi-level password-protected web access for configuration
• URL and keyword filtering
• Site-to-site IPsec VPN with support for NAT transparency (NAT-T) or VPN Server functionality, allowing remote access with the Cisco VPN Client
• Hardware-accelerated Data Encryption Standard (DES), 3DES
• 5 IPsec tunnels
• VPN pass-through for IPsec, Point-to-Point Tunneling Protocol (PPTP), and L2TP

QoS features

• Per interface traffic shaping
• Low Latency Queuing (1 Priority Queue + 4 Weighted Round Robin queues)

Provisioning, administration, and maintenance

• TR-069, TR-098, TR-104
• Automated provisioning and upgrade via Cisco XML profile, HTTP, HTTPS, TFTP
• Asynchronous notification of upgrade availability via SIP NOTIFY
• Web browser administration and configuration via integral web server
• Event logging
• Voice statistics in SIP BYE message
• Syslog and debug server records
• Per-line and purpose configurable syslog and debug options
• Simple Network Management Protocol (SNMP) versions 1, 2, and 3c

High-availability features

Automatic failover and recovery of WAN connection enabled by supported USB mobile broadband modem or by second WAN interface (SRP540 models)

Table 3. Voice Features of the Cisco SRP500 Series



Voice gateway

• SIP version 2 (RFC 3261)
• SIP messages via UDP/TCP
• Echo cancellation (G.167 and G.168)
• Dynamic jitter buffer
• Simple traversal of UDP through NAT (STUN) (RFC 3489)
• SDP (RFC 2327)
• 3-way conferencing
• Dual-tone multifrequency (DTMF) tone detection and generation
• Voice activity detection (VAD)
• Silence suppression
• Comfort noise generation (CNG)
• Caller ID generation and detection (frequency shift keying [FSK] and DTMF)
• Media loopback
• SIP Transport Layer Security (TLS)
• Support for 2 simultaneous voice or fax calls per port

International Telecommunications Union (ITU) standard voice codecs

Voice algorithms

• G.711 (a-law and μ-law)
• G.726-32
• G.729a

Telephony interface signaling support

• Ring voltage: 40 to 90 Vpk
• Ring frequency: 20 to 25 Hz

Voice features

• Secure calling
• Call forwarding: no answer/busy/unconditional
• Call transfer
• Call waiting/hold/retrieval
• Three-way conferencing
• Caller ID number and name (primary line and on call waiting)
• Caller ID block (prevents sending out the caller ID)
• Anonymous call blocking
• Distinctive ringing
• Do not disturb setting
• Repeat dialing on busy
• Call return
• Emergency call support
• Dial plan
• Speed dial

Voice port interfaces

2 FXS ports, 1 relay FXO port (SRP520 models); 4 FXS ports, 1 active FXO port (SRP540 models)

Fax and modem

• Fax and modem pass-through
• T.38 fax relay, including V.17, V.21, V.27ter, and V.29 and fax pass-through (pulse code modulation [PCM]) (T.38 support is dependent on fax machine and network/transport resilience)

Table 4. Wireless Features of the Cisco SRP500 Series



WLAN hardware

• 802.11n (supports 802.11b/g/n)
• WPA and WPA2 Personal and Enterprise
• Wi-Fi Multimedia (WMM)
• Single captive antenna (SRP520 models)
• Dual TNC antennas (SRP540 models)
• Default antenna gain: 1.8 dBi
• WPS button associated with configurable SSID
• Guest network feature provides vistor Internet access

WLAN security features

• 802.11i
• Wireless Protected Access (WPA and WPA2), Advanced Encryption Standard (AES)
• Static and dynamic WEP
• Temporal Key Integrity Protocol/Simple Security Network (TKIP/SSN) encryption
• MAC authentication/filter
• Configurable RADIUS authentication for wireless clients
• Pre-Shared Keys (PSK)



System Specifications

Table 5 lists the system specifications for Cisco SRP500 Series Services Ready Platforms

Table 5. System Specifications for the Cisco SRP500 Series models



Default DRAM

SRP520-U: 128MB, SRP540: 256MB

Default flash memory

64 MB


• Fast Ethernet (SRP521W)
• ADSL2+ Annex B (SRP526W)
• ADSL2+ Annex A (SRP527W)
• 2 x Gigabit Ethernet (SRP541W)
• ADSL2+ Annex B and Gigabit Ethernet (SRP546W)
• ADSL2+ Annex A and Gigabit Ethernet (SRP547W)


4-port 10/100 Mbps Fast Ethernet managed switch (SRP520 models)

4-port 10/100/1000 Mbps Gigabit Ethernet managed switch (SRP540 models)

802.11n WLAN


USB ports

• 1 port (SRP520 models)
• 2 ports (SRP540 models)


Power, WAN (Ethernet), ADSL Carrier Detect, ADSL Data, USB, Wi-Fi, Phone and Line, LAN, WPS

External power supply

Universal 100 to 240 VAC

Approvals and compliance

Class B for SRP520 models; Class A for SRP540 models


Wi-Fi Alliance certified

Regulatory Compliance


• IEC 60950-1
• AS/NZS 60950.1
• CAN/CSA-C22.2 No. 60950-1
• EN 60950-1
• UL 60950-1


• EN 55024
• EN 300-386
• EN 61000-6-2
• EN 50082-1
• EN 55024 (CISPR 24)


• FCC Part 15, ICES-003
• EN55022, CISPR 22
• EN 300-386
• EN 61000-3-2
• EN 61000-3-3
• EN 50082-1
• EN 55024, CISPR 24
• EN 61000-4-2
• EN 61000-4-3
• EN 61000-4-4
• EN 61000-4-5
• EN 61000-4-6
• EN 61000-4-8
• EN 61000-4-11


• CFR47 part15.247
• RSS-210 Rev 5
• ETSI EN 300.328.1
• ETSI EN301.489.1&.17
• AS./NZS 4268


• TIA-968
• CS-03
• ACIF S002
• ACIF S003
• ACIF S043
• ANZ PTC200
• ANZ PTC220
• ANZ PTC273
• TBR21

Environmental operating range

• Operating temperature: 32 to 104°F (0 to 40°C)
• Non-operating temperature: -22 to 158ºF (-30 to 70ºC)
• Operating humidity: 5 to 95% non-condensing

Cisco Services

As part of the Cisco Small Business family, Cisco SRP500 Series Services Ready Platforms are supported by professionals in Cisco Small Business Support Center locations worldwide who are specifically trained to understand small businesses. The Cisco Small Business Support Community, an online forum, enables small business customers to collaborate with their peers to get answers and solve problems. The optional Cisco Small Business Support Services delivers 3-year peace of mind support with telephone and chat support, software updates as available, and next-business-day advanced hardware replacement, as needed.