Cisco 800 Series Router Buying Guide: C88x, C89x, and LTE Models

Small branches, kiosks, and DSL-fed sites still run on Cisco 800 Series routers—compact fixed platforms that bake WAN media, a small LAN switch, and IOS security into one chassis. Choosing the right PID is less about brand familiarity and more about matching Ethernet versus DSL versus LTE, then deciding whether to keep an aging 800 or step up to a newer ISR.

This guide is for network engineers and procurement teams specifying hardware from our Cisco 800 Series Routers category: C88x Ethernet and DSL models, C89x Gigabit CPE, C819 cellular/hardened units, and C899 LTE. For the broader ISR 4000 / 1000 / 900 landscape, use our companion Cisco ISR Router Buying Guide. Campus switching around these edges is covered in the Cisco Switch Buying Guide.

Start with WAN media, not the family name

Cisco’s 800 Series spans several fixed families that share a small-office mission but not the same WAN. Write down primary and backup circuits first: Fast Ethernet handoff, Metro Gigabit or SFP, VDSL2/ADSL2+ over POTS or ISDN, G.SHDSL, or 4G LTE with a regional band set. Then note how many LAN devices need switch ports, whether integrated 802.11n is acceptable versus a dedicated AP, and whether the chassis must be hardened for harsh environments.

• WAN type: Encoded in the PID—C881 is FE Ethernet; C886VA/C887VA are multimode DSL; C888 is G.SHDSL; C891F/C892FSP are Gigabit; C819G-4G and C899G-LTE add cellular.
• LAN edge: Most C88x units include a four-port 10/100 managed switch; C89x and C899 add eight Gigabit switch ports.
• Security baseline: These platforms ship with IOS firewall, IPsec VPN (3DES/AES), and related security services documented in Cisco’s 880/890/819 data sheets—confirm the feature set and any Advanced IP Services upgrade before cutover.
• Lifecycle: Many 800 Series PIDs are aging. Use them for like-for-like replacement and spare coverage; plan greenfield and major upgrades on ISR 1000/1100 or 900 Series.

Compare the 800 families you will actually quote

880 Series: Ethernet, DSL, and G.SHDSL workhorses

Cisco documents the newer fanless C88x-K9 PIDs as quiet small-office routers with a four-port 10/100 managed switch and Advanced Security as the default feature set. Match the WAN carefully:

• C881-K9 — 10/100 Fast Ethernet WAN for simple Ethernet handoffs. No integrated Wi-Fi, 3G, or ISDN dial backup on this PID.
• C881WD-A-K9 — wireless 881-class unit with dual-band 802.11n (FCC -A), four LAN ports, and one WAN port when you want routing plus onboard Wi-Fi in one box. For cleaner Wi-Fi scale-out, many designs still prefer a separate AP—see our wireless AP buying guide.
• C886VA-K9 — multimode VDSL2/ADSL2/2+ over ISDN with ISDN dial backup for European-style ISDN DSL plants.
• C886VAJ-K9 — Annex J over ISDN variant when the carrier requires that annex profile.
• C887VA-K9 — multimode VDSL2/ADSL2/2+ over POTS (basic telephone service) for common Annex A DSL deployments.
• C888-K9 — G.SHDSL (EFM/ATM) WAN with ISDN dial backup for symmetrical copper WAN.

Cisco rates the 880 Series at about 20 recommended users. That is the right mental model for a clinic, insurance office, or retail back room—not a crowded campus edge.

890 Series: Gigabit CPE with optional Wi-Fi

The 890 Series steps up to Gigabit LAN switching and richer WAN options. Cisco’s 890 data sheet positions these as small-branch CPE with roughly 50 recommended users, default 512 MB DRAM (upgradable to 1 GB on listed models), and 256 MB flash.

• C891F-K9 — one GE or SFP WAN plus one FE WAN, eight-port GE managed switch (four ports PoE-capable with the appropriate 125 W supply), optional CleanAir Wi-Fi, and integrated V.92 modem plus ISDN BRI dial backup.
• C891FW-A-K9 — the same 891F platform with dual-radio 802.11n Wi-Fi for the FCC (-A) domain when the BOM needs onboard wireless.
• C892FSP-K9 — dual Gigabit WAN (GE or SFP plus GE), eight-port GE switch, no integrated Wi-Fi, no dial backup, and no PoE—ideal when you want clean Metro Ethernet / fiber CPE without wireless complexity.

Order SFPs from Transceivers when the design uses the combo SFP WAN, and confirm power under Cisco Power Supplies if PoE on a 891F is in scope.

819 and 899: cellular, hardened, and denser LTE edges

When the circuit is a SIM card—or the backup must be cellular—start here.

The C819G-4G-NA-K9 is Cisco’s compact non-hardened 819 4G LTE 2.0 M2M router for North America. Cisco documents LTE bands 2 (PCS 1900), 4 (AWS), 5 (850), and 17 (700) with UMTS/HSPA+ fallback, a Sierra Wireless MC7354 modem, four 10/100 LAN ports, Gigabit Ethernet and serial WAN options alongside LTE, 1 GB DRAM and flash, and about 20 recommended users. Dual multiband antennas and an extender ship with the platform per the data sheet—still confirm antenna placement and carrier provisioning on the RFQ.

The C819HWD-A-K9 listing is a hardened 819 with four Fast Ethernet ports and dual-band FCC Wi-Fi for rugged or wall-mount edges. Do not assume LTE on this SKU—the PID is Wi-Fi hardened, not 4G.

The C899G-LTE-NA-K9 is listed as a Cisco 899G 4G LTE 2.0 ISR with eight 10/100/1000 RJ-45 ports—use it when you need integrated North America LTE plus a denser Gigabit LAN than the four-port 819 switch provides.

Decode the part number before you order

• -RF — refurbished unit in our catalog (for example C881-K9-RF).
• /K9 or -K9 — strong cryptography / security image packaging.
• VA / VAJ — multimode VDSL2/ADSL2+; VAJ marks Annex J over ISDN.
• FW / WD / HWD — wireless variants; -A is FCC domain, -E would be ETSI (order the domain that matches the country).
• FSP on C892FSP — Gigabit Ethernet security router with SFP (fiber-capable WAN).
• 4G-NA / LTE-NA — cellular SKU provisioned for North America bands; match carrier requirements before purchase.
• H in C819H… — hardened environmental packaging.

Keep, spare, or step up?

Use 800 Series hardware when you need a like-for-like spare, a DSL/G.SHDSL PID that still matches the carrier, or a low-cost temporary edge. Step up when any of these are true: you need Catalyst SD-WAN / modern IOS XE controller mode as the long-term standard, sustained throughput or app-hosting beyond what a fixed 800 delivers, Wi-Fi 6 access instead of integrated 802.11n, or a platform with clearer multi-year lifecycle. Natural next catalogs are Cisco ISR routers, 1100 Series, and 900 Series—compare those families in the ISR buying guide before you freeze a refresh BOM.

Accessories that stall installs

Complete the quote with SFPs from Transceivers, copper from Network Cables, LTE/Wi-Fi antennas where the PID expects them, and spare adapters from Cisco Power Supplies. Expansion cards are uncommon on these fixed platforms, but if the wider design mixes modular ISRs, browse Cisco Expansion Modules. Voice endpoints at the site pair with our IP Phone & Collaboration guide; a separate access switch decision can use Meraki MS vs Catalyst 9000.

Pre-RFQ checklist

• Primary and backup WAN media (Ethernet, DSL annex, G.SHDSL, LTE band region)
• Required LAN port speed/count and whether integrated 802.11n is acceptable
• Hardened vs non-hardened mounting environment
• Security feature set (Advanced Security vs Advanced IP Services) and Smart Account entitlements on -RF units
• Keep-vs-refresh decision and whether 1100/900/ISR is the better long-term buy
• Antennas, SIMs, SFPs, PoE power supply, quantities, and cutover date

FAQ

What is the Cisco 800 Series best used for?

Compact fixed-configuration branch and teleworker sites that need routing, a small LAN switch, IOS security, and a specific WAN type (Ethernet, DSL, G.SHDSL, or LTE) in one chassis. Cisco sizes 880/819-class platforms around twenty users and 890-class platforms around fifty.

How do C881, C887VA, and C888 differ?

All three are 880 Series routers with a four-port Fast Ethernet switch. C881 uses a Fast Ethernet WAN. C887VA adds multimode VDSL2/ADSL2+ over POTS. C888 uses G.SHDSL (EFM/ATM) WAN with ISDN dial backup. Pick by the circuit the carrier delivers.

When should I choose C891FW-A-K9 instead of C892FSP-K9?

Choose C891FW-A-K9 when you want the 891F Gigabit platform plus dual-radio FCC 802.11n Wi-Fi and dial-backup options. Choose C892FSP-K9 when you need dual Gigabit WAN (including SFP) without integrated Wi-Fi or PoE—cleaner Metro Ethernet CPE.

Which 800 Series models include 4G LTE?

In our verified catalog, C819G-4G-NA-K9 and C899G-LTE-NA-K9 are the LTE SKUs. Match North America band support to your carrier. C819HWD-A-K9 is hardened Wi-Fi, not LTE.

What does -RF mean on these part numbers?

On M&F Collaboration listings, -RF means refurbished. Hardware follows the base Cisco PID; confirm IOS feature licenses and Smart Account entitlements before production cutover.

Should I refresh an 800 Series site to ISR 1000/1100 instead?

Yes when you need longer platform life, modern SD-WAN/IOS XE workflows, higher throughput, or Wi-Fi handled by current access points. Keep 800 Series for like-for-like spares and DSL/LTE PIDs that still match the plant; otherwise compare 1100 Series and the ISR buying guide.