Cisco 900 Series Integrated Services Routers Data Sheet

Data Sheet

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Updated:April 17, 2020

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The Cisco® 900 Series Integrated Services Routers (ISRs) combine Internet access, comprehensive security, and wireless services in a single high-performance device that is easy to deploy and manage. They are well suited for deployment as Customer Premises Equipment (CPE) in enterprise small branch offices and in service provider managed-service environments.

Product Overview

The Cisco 900 Series ISRs deliver integrated security and threat defense, protecting networks from both known and new Internet vulnerabilities and attacks. These powerful, fixed-configuration routers provide secure broadband and Metro Ethernet and wireless LTE WAN connectivity. Service providers offering both managed Ethernet and wireless LTE WAN services can deploy them in customer locations as CPE. Centralized and remote management capabilities are available through web-based tools and Cisco IOS® Software for full visibility and control of network configurations at the remote site.

The 900 Series ISRs simplify the deployment of Ethernet WAN services, with end-to-end Operations, Administration, and Maintenance (OA&M), Service-Level Agreement (SLA) monitoring and verification, and configuration management.

The Cisco 900 Series ISRs come with a 4-port managed switch, providing LAN ports to connect multiple devices. Figures 1 and 2 show the C921-4P and C926-4P models.

Related image, diagram or screenshot

Figure 1.       

C921-4P ISR Front, Back, and Top Views

Related image, diagram or screenshot

Figure 2.       

C926-4P ISR Front, Back, and Top Views

Features and Benefits

Table 1 describes some of the business needs enterprises have in branch offices and other edge networking locations and how the Cisco 900 Series ISRs fulfill those requirements.

Table 1.        How the Cisco 900 Series ISRs Address Edge Networking Challenges

Business need

Features and descriptions

High availability and business continuity

  Redundant WAN connections for failover protection and load balancing
  Dynamic failover protocols such as Virtual Router Redundancy Protocol (VRRP, RFC 2338), Hot Standby Router Protocol (HSRP), and Multigroup HSRP (MHSRP)

Consistent, high application performance levels

  Can run multiple services simultaneously with no performance degradation

Risk mitigation with multilevel security

  Network perimeter security with integrated application inspection firewall
  Data privacy through high-speed IP Security (IPsec) Triple Data Encryption Standard (3DES) and Advanced Encryption Standard (AES) encryption
  Enforced security policy with intrusion prevention
  Security hardware acceleration
  Next-generation encryption for secure network communications systems, reliable for the next decade

Feature consolidation for real estate, Capital Expenditures (CapEx), and management savings

  Supports LAN connections

Unified control of wired and wireless networks from a common console for streamlined operations

  Simplifies and centralizes configuration and management of wireless and wireline devices

Remote configuration and management to keep local IT staff lean

  Supports separate console ports

Platform Support

Table 2 describes the interfaces and integrated capabilities supported by each of the Cisco 900 Series ISR models.

Table 2.      Cisco 900 Series ISRs Ethernet and DSL only SKUs


WAN interfaces

LAN interfaces

Integrated USB 2.0


2 ports Gigabit Ethernet (GE)

4-port GE managed switch



2 ports Gigabit Ethernet (GE)

4-port GE managed switch



1 port GE and 1 VADSL (Annex A)

4-port GE managed switch



1 port GE and 1 VADSL (Annex B/J)

4-port GE managed switch



1 port GE and 1 VADSL (Annex M)

4-port GE managed switch


Table 3.      Cisco 900 Series ISRs LTE SKUs



LAN switch

Integrated USB 2.0


























(Annex A)






(Annex A)






(Annex A)






(Annex M)






(Annex B/J)





Table 4.        Cisco LTE 2.5 Bands Supported











LTE bands 1, 3, 7, 8, 20, 28.

FDD LTE 700 MHz (band 28),

800 MHz (band 20), 900 MHz

(band 8), 1800 MHz (band 3), 2100 MHz (band 1), and

2600 MHz (band 7)

LTE bands 1, 3, 5, 8, 40, 41

FDD LTE 850 MHz (band 5 CLR), 900 MHz (band 8), 1800 MHz (band 3), and 2100 MHz (band 1). TDD LTE 2300 MHz (band 40), and 2500 MHz (band 41)

LTE bands 1, 3, 5, 7, 8, 28

FDD LTE 700 MHz (band 28), 850 MHz (band 5 CLR), 900 MHz (band 8), 1800 MHz (band 3), 2100 MHz (band 1), and 2600 MHz (band 7)

Theoretical Category 4 download/upload speeds

150 Mbps/50 Mbps

150 Mbps/50 Mbps

150 Mbps/50 Mbps









Middle East with specific LTE bands/frequencies
















Southeast Asia




Latin America

Dependent upon specific operators supporting the LTE bands listed above

Dependent upon specific operators supporting the LTE bands listed above


Table 5.        Cisco LTE



Important LTE features

  Multichannel-Interface-Processor (MIP) profile configuration
  Remotely initiated data callback using voice
  Remotely initiated data callback using Short Message Service (SMS)
  Remote firmware upgrade over LTE
  SIM lock and unlock capabilities

Single SIM support

  High reliability, and cellular multihoming support for single micro (3FF) SIMs card socket; compliant with ISO-7816-2 (SIM mechanical), Auto SIM carrier capability with correct firmware selection


  Send and receive SMS (maximum 160 characters)

Modem information

Modem form factor: WP7600 series for Cisco LTE 2.5

Wireless technologies supported (performance and throughput)

Cisco LTE 2.5 (Refer to Table 10: LTE Bands Supported) Backward compatibility:

  LTENA, LTEGB, LTEAU: UMTS, HSPA+ (Band 1, 5, 8), EDGE, GSM, GPRS (900/1800)
  LTEAS: UMTS, HSPA+ (Band 1, 8), EDGE, GSM, GPRS (900/1800)

Included antenna

  One multiband swivel-mount dipole antennas (LTE-ANTM-SMA-D) are included with all Cisco LTE 2.5 (Recommend to order 2 nd LTE-ANTM-SMA-D option for better 2X2 MIMO coverage)

For –N antenna and cable installation guidance, view the Connected Grid Antennas Installation Guide

Carrier support

  For a list of carriers that offer services on the Cisco 1100 Series LTE Advanced 3.0, please visit the Wireless Carrier Partners page

Product Specifications

Table 5 shows Cisco IOS Software features and general system specifications for the 900 Series ISRs.

Table 6.        Cisco IOS Software Features and System Specifications




Cisco IOS Software

IP and IP services

  Routing Information Protocol Versions 1 and 2 (RIPv1 and RIPv2)
  Generic Routing Encapsulation (GRE) and Multipoint GRE (MGRE)
  Cisco Express Forwarding
  Standard 802.1d Spanning Tree Protocol
  Layer 2 Tunneling Protocol (L2TP)
  L2TP Version 3 (L2TPv3)
  Network Address Translation (NAT)
  Dynamic Host Configuration Protocol (DHCP) server, relay, and client
  Dynamic DNS
  DNS Proxy and DNS Spoofing
  Access Control Lists (ACLs)
  IPv4 and IPv6 multicast
  Open Shortest Path First (OSPF)
  Border Gateway Protocol (BGP)
  Performance Routing (PfR)
  Enhanced Interior Gateway Routing Protocol (EIGRP)
  Virtual Route Forwarding (VRF) Lite
  Next Hop Resolution Protocol (NHRP)
  Bidirectional Forwarding Detection (BFD)
  Web Cache Communication Protocol (WCCP)



  True Multimode VDSL2 and ADSL2+ over Annex A, B, J, and M, including traditional G.DMT and T1.413
  World-class interoperability with industry-standard DSL Access Multiplexer (DSLAM) chipsets
  Highest field reliability with Impulse Noise Protection (INP) over Repetitive Electrical Impulse Noise (REIN) and single isolated impulse noise (SHINE), extended INP delay, G.INP, physical layer retransmission, Seamless Rate Adaptation (SRA), and Bitswap
  VDSL2 Persistent Storage Device (PSD) profiles up to 17a/b with support for spectral shaping
  VDSL2 vectoring to offer blazing fiber speeds over copper
  Remote management with TR069 and CWMP
  Investment protection with Gigabit Ethernet


Switch features

  Auto Media Device In/Media Device Cross Over (MDI-MDX)
  25 802.1Q VLANs
  MAC filtering
  Switched Port Analyzer (SPAN)
  Storm control
  Smart ports
  Secure MAC address
  Internet Group Management Protocol Version 3 (IGMPv3) snooping


Security features

Secure connectivity:

  Secure Sockets Layer (SSL) VPN for secure remote access
  Hardware-accelerated DES, 3DES, AES 128, AES 192, and AES 256
  Public-Key-Infrastructure (PKI) support
  50 IPsec tunnels
  Cisco Easy VPN client and server
  NAT transparency
  Dynamic Multipoint VPN (DMVPN)
  Tunnel-less Group Encrypted Transport VPN (GET VPN)
  VRF-aware IPsec
  IPsec over IPv6
  Adaptive control technology
  Session Initiation Protocol (SIP) application-layer gateway
  Cisco IOS Firewall:
  Zone-based policy firewall
  VRF-aware stateful inspection routing firewall
  Stateful inspection transparent firewall
  Advanced application inspection and control
  HTTPS, FTP, and Telnet Authentication Proxy
  Dynamic and static port security
  Firewall stateful failover
  VRF-aware firewall
  Cisco IOS Software blocked and allowed lists
  Control plane policing
  Flexible packet matching
  Network foundation protection


Quality of Service (QoS)

  Low-Latency Queuing (LLQ)
  Weighted Fair Queuing (WFQ)
  Class-Based WFQ (CBWFQ), Class-Based Traffic Shaping (CBTS), Class-Based Traffic Policing (CBTP)
  Policy-Based Routing (PBR)
  Class-Based QoS MIB
  Class of Service (CoS)-to-Differentiated Services Code Point (DSCP) mapping
  Class-Based Weighted Random Early Detection (CBWRED)
  Network-Based Application Recognition (NBAR)
  Link Fragmentation and Interleaving (LFI)
  Resource Reservation Protocol (RSVP)
  Real-Time Transport Protocol (RTP) header compression (cRTP)
  Differentiated Services (DiffServ)
  QoS preclassify and prefragmentation
  Hierarchical QoS (HQoS)



  Cisco Configuration Professional
  Cisco Configuration Express
  Cisco Configuration Engine support
  Cisco AutoInstall
  Cisco IP Service-Level Agreement (IP SLA)
  Cisco IOS Embedded Event Manager (EEM)
  Cisco Security Manager
  Telnet, Simple Network Management Protocol Version 3 (SNMPv3), Secure Shell (SSH) Protocol, Command-Line Interface (CLI), and HTTP management
  Cisco Next Generation Plug-and-Play (NG PnP) Protocol


High availability

  Virtual Router Redundancy Protocol (VRRP) (RFC 2338)


Metro Ethernet

  Ethernet OA&M
  Ethernet Local Management Interface (E-LMI)
  IP SLA for Ethernet



  IPv6 addressing architecture
  IPv6 name resolution
  IPv6 statistics
  IPv6 translation: Transport packets between IPv6-only and IPv4-only endpoints (NAT-Protocol Translation)
  Internet Control Message Protocol Version 6 (ICMPv6)
  IPv6 Path Maximum Transmission Unit (PMTU)
  IPv6 neighbor discovery
  IPv6 stateless address autoconfiguration (SLAAC)
  IPv6 multicast routing


Application visibility and control

  Flexible NetFlow (FNF)
  Performance Agent


Number of recommended users



Default and maximum DRAM

  Default 1 GB


Default and maximum flash memory

  2 GB on all Cisco 900 Series ISR models; not upgradable



  Refer to Table 2, 3 and 4 for details


LAN switch

  Refer to Table 2 for details


Separate console ports



USB 2.0

  One USB 2.0 Type A port

Note: USB 2.0 ports cannot be used for connecting external devices other than those specified at:


Physical dimensions, LEDs, and weight


  C921-4P, C931-4P, and C921-4PLTEXX
  H x W x D = 1.70 x 9.0 x 9.5 in. (4.32 x 22.86 x 24.13 cm) (includes rubber feet)
  C927-4P, C927-4PM, C926-4P, C927-4PLTEXX, C927-4PMLTEXX, and C926-4PLTEXX
  H x W x D = 1.10 x 10.20 x 7.00 in. (2.80 x 25.91 x 17.78 cm) (includes rubber feet)


  1x green per Ethernet
  2x green DSL - CD+Data
  1x bicolor LED LTE RSSI
  1x green LED LTE SIM/Activity
  System OK

Weight: 2.65 lb (1.20 kg) maximum


Power supply

Power specifications:

  AC input voltage: Universal 100 to 240 VAC
  Frequency: 50 to 60 Hz
  Internal power supply (C921-4P, C931-4P, and C921-4PLTEXX only)
  External power adapter (C927-4P, C927-4PM, C926-4P, C927-4PLTEXX, C927-4PMLTEXX, and C926-4PLTEXX only): 12 VDC; 30 W


Approvals and compliance


  IEC 60950-1
  UL 60950-1
  CAN/CSA C22.2 No. 60950-1
  EN 60950-1
  AS/NZS 60950.1
  Class I Equipment (C921-4P and C931-4P only)
  Class III Equipment (C927-4P, C927-4PM, and C926-4P only)


  47 CFR Part 15: 2006
  CISPR22: Edition 6.0: 2008
  CNS13438: 2006
  EN 300 386 V1.6.1
  EN 55032
  EN61000-3-2: 2006 [+ amd 1 & 2]
  EN61000-3-3: 2008
  ICES-003 Issue 5: 2012
  KN 22: 2009
  TCVN 7189: 2009
  VCCI: V-3/2012.04


  CISPR24: 2010 [+ amd 1 & 2]
  EN300386: V1.6.1
  EN55024: 2010
  EN61000-6-1: 2007
  KN24: 2011
  TCVN 7317:2003


Environmental operating range

  Nonoperating temperature: -40° to 158°F (-40° to 70°C)
  Nonoperating humidity: 5% to 95% relative humidity (noncondensing)
  Nonoperating altitude: 0 to 15,000 ft (0 to 4570 m)
  Operating temperature:
  C921-4P and C931-4P: 0° to 50°C (de-rate 1°C per 1000-ft increase in altitude)
  C927-4P, C926-4P, C927-4PM, C921-4PLTEXX,: 0° to 45°C (de-rate 1°C per 1000-ft increase in altitude)
  Operating humidity: 5% to 95% relative humidity (noncondensing)
  Operating altitude: 0 to 10,000 ft (0 to 3000 m)


Cisco IOS Software Licensing and Packaging

Cisco IOS Universal Image

A single Cisco IOS Universal image encompassing all functions is delivered with the platform. Advanced features can be enabled simply by activating a software license on the Universal image. Technology packages and feature licenses, enabled through right-to-use licenses, simplify software delivery and decrease the operational costs of deploying new features.

Three major technology licenses are available on the Cisco 900 Series; these licenses can be activated through the Cisco software activation process identified at The following licenses are available:

      IP Base: This technology package is the default

      Application Experience (APP): This license includes data and application performance features

      Security (SEC) or Security with No Payload Encryption (SEC-NPE): This license includes features for securing network infrastructure

Table 7 lists the part numbers and features for each of the licenses. Table 8 lists the part numbers for the software images.

Table 7.        Licenses

Part number




IP Base (default)

Routing protocols, ACL, NAT, QoS, BFD, VRF Lite, IP SLA Responder


Application Experience (APP)

IP Base + advanced networking protocols: L2TPv3, MPLS

Application Experience: PfRv3, NBAR2, AVC, IP SLA Initiator

Hybrid Cloud Connectivity: LISP, Virtual Private LAN Services (VPLS), Ethernet over MPLS



Security (SEC)

IP Base + Advanced Security: Zone-based firewall, IPsec VPN, DMVPN, FlexVPN, GET VPN, SSL VPN

Provides up to 250-Mbps IPsec performance

Table 8.        Software Images

Part number


Router software images


C900-universalk9-mz: Universal image for C921-4P, C931-4P, C927-4P, C927-4PM, C926-4P,C921-4PLTE*,C926-4PLTE*,C927-4PLTE*


Cisco 900 ISR Universal image and non-payload encryption image

Ordering Information

Table 6 lists the part numbers and Cisco IOS Software image details for each of the Cisco 900 Series ISR models. To place an order, visit the Cisco Ordering Home Page. To download software, visit the Cisco Software Center.

Table 9.        Product Part Numbers and Software Images

Part number

Product description

Integrated services routers

C921-4P (C921-4PLTEGB, C921-4PLTEAS and C921-4PLTEAU)

Cisco 921 Gigabit Ethernet security router with internal power supply
(with CAT4 LTE)


Cisco 931 Gigabit Ethernet security router with internal power supply

C927-4P (C927-4PLTENA, C C927-4PLTEGB and C927-4PLTEAU)

Cisco 927 Gigabit Ethernet security router with VDSL/ADSL2+ Annex A
(with CAT4 LTE)

C927-4PM (C927-4PMLTEGB)

Cisco 927 Gigabit Ethernet security router with VDSL/ADSL2+ Annex M
(with CAT4 LTE)

C926-4P (C926-4PLTEGB)

Cisco 926 Gigabit Ethernet security router with VDSL/ADSL2+ Annex B/J
(with CAT4 LTE)

  Cisco C921-4P and C931-4P are supported only on Cisco IOS Software Release 15.8(3)Mb and later
  Cisco C927-4P, C927-4PM, C926-4P, and C921-4PLTE *, C926-4PLTE *, C927-4PLTE * are supported only on Cisco IOS Software Release 15.8(3)M1 and later

Mount kits


Rack-mount kit for 900 Series ISRs [Only for C921-4P, C931-4P, and C921-4PLTEXX]


Under-the-desk mount kit for all 900 Series ISRs [Only for C921-4P, C931-4P, and C927-4PLTEXX, C927-4PMLTEXX, and C926-4PLTEXX ]

For additional information and details about Cisco IOS Software licensing and packaging on the 900 Series, please visit:

For the Cisco 900 Series ISR Hardware and Software Installation Guide, go to:

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Cisco and Partner Services

Services from Cisco and our certified partners can help you reduce the cost and complexity of branch-office deployments. We have the depth and breadth of experience across technologies to architect a blueprint for a branch-office solution to meet your company's needs. Planning and design services align technology with business goals and can increase the accuracy, speed, and efficiency of deployment. Technical services help maintain operational health, strengthen software application functions, solve performance problems, and lower expenses. Optimization services are designed to continually improve performance and help your team succeed with new technologies. For more information, visit

Cisco Smart Net Total Care® technical support for the 900 Series ISRs is available on a one-time or annual contract basis. Support options range from help-desk assistance to proactive, onsite consultation. All support contracts include:

      Major Cisco IOS Software updates in protocol, security, bandwidth, and feature improvements

      Full access rights to technical libraries for technical assistance, electronic commerce, and product information

      24-hour access to the industry’s largest dedicated technical support staff

For More Information

For more information about the Cisco 900 Series ISRs, visit or contact your local Cisco account representative.

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Document History

New or revised topic

Described in


Added support for CAT4 LTE models

Table 2: Cisco 900 Series ISRs DSL and LTE SKUs

April 11, 2019

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