BCM88280 · Compact 1RU · IEEE 1588v2 Class C · SyncE

Broadcom Qumran 2U Qumran 2U Routers Compact SP CSR. Cell-site gateway. The right shape for the access edge.

Two open-hardware short-depth 1RU SP routers validated on OcNOS-SP: Edgecore AS7515-24X (uplink-heavy) and UfiSpace S9510-30XC (access-heavy). Same Q2U silicon, two different port-mix philosophies. Hardware PTP/SyncE timing, full SP routing stack, sized for cell-site and Tier-3 metro edge.

01The Routers 02Inside the Silicon 03Q-Family Map 04OcNOS-SP
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~360Gbps
Switch Capacity
25/100G
Port Speeds
±82ns
PTP Class C Phase
2SKUs
OcNOS-SP Validated
1RU
Compact Form Factor
01
The Routers
Open hardware running Qumran 2U

Same chip. Two port-mix philosophies. Pick by the role.

AS7515-24X is uplink-heavy (4 × 100G to the core, 20 × 25G to the access) — sized for cell-site gateway aggregation. S9510-30XC is access-heavy (28 × 25G to the access, 2 × 100G uplinks) — sized for larger pre-aggregation hubs. Both run the same OcNOS-SP image. Each card links to the full vendor datasheet (PDF, hosted locally).

Edgecore· AS series
Compact SP CSR · cell-site

AS7515-24X

Validated on OcNOS-SP · ONIE pre-loaded
Ports
20 × 25G SFP28 + 4 × 100G QSFP28Breakout: 100G ports break out to 4×25G or 4×10G
Form
1RU · short-depth 300 mm
Power
~150 W typical · AC/DCTiming: PTP Class C · SyncE G.8262
CPU
Intel · 2 GB RAM
▌ Pick this when

Mobile cell-site gateway with 4 × 100G uplinks. Right shape for 5G fronthaul/midhaul aggregation where each cell delivers 25G to the box and the box uplinks to metro core at 100G.

Edgecore AS7515-24X datasheet PDF
UfiSpace· S9510 series
Compact SP edge · TSN-capable

S9510-30XC

Validated on OcNOS-SP · ONIE pre-loaded
Ports
28 × 25G SFP28 + 2 × 100G QSFP28Breakout: 100G ports break out to 4×25G or 4×10G
Form
1RU · short-depth 302 mm
Power
~160 W typical · AC/DCTiming: PTP Class C · SyncE G.8262 · TSN
CPU
Intel · 2 GB RAM
▌ Pick this when

Higher access-side density (28 × 25G) for larger pre-aggregation hubs where you need more drops to the access side and fewer uplinks. Adds TSN forwarding for industrial / utility deployments.

UfiSpace S9510-30XC datasheet PDF

· How Qumran 2U fits in the SP edge stack

vs Q2AQ2A (BCM88483) is 800 Gbps with 400G ZR-ready cages — step up when you need 400G uplinks or deep buffer.
vs J2C+J2C+ (BCM88850) is the carrier-core class — 7.2 Tbps with full Internet-scale FIB. Sit Q2U in front of J2C+ at the access.
5G CSR sweet spot20 × 25G fronthaul + 4 × 100G to metro core (AS7515-24X). G.8275.1 timing budget closes in the box.
Industrial / utilityS9510-30XC adds TSN forwarding for time-sensitive deterministic latency. Substation automation, IEC 61850.
02
Inside the Silicon
Compact SP edge silicon

Qumran 2U — purpose-built for the access edge.

The BCM88280 Qumran 2U is Broadcom's compact SP edge ASIC — ~360 Gbps switching capacity in a 1RU short-depth box, sized for cell-site / Tier-3 / FTTx-pre-aggregation roles where TH/TD-class capacity would be wasted. Same StrataDNX heritage as Q2A and J2C+, but tuned for smaller deployments.

What stays the same as the rest of the Q-family: hardware-assisted PTP at Class C accuracy, full SyncE G.8262, deep-buffer architecture (smaller than Q2A but still asymmetric for N:1 fan-in), and the full OcNOS-SP feature set — BGP-LU, SR-MPLS with TI-LFA, EVPN-MPLS, MPLS L2VPN/L3VPN, MACsec.

What changes: lower power envelope (some platforms support fanless deployments for outdoor cabinets), no 400G ports, and a smaller table-size profile that fits the access-edge BGP/MPLS scale. Cross-checked against Broadcom\'s BCM88280 product page and the linked vendor datasheets.

SeriesStrataDNX Capacity~360 Gbps Timing1588v2 Class C · SyncE Form1RU short-depth Power~150 W typical

· Two port-mix philosophies · same chip

AS7515-24X · uplinks4 × 100G
AS7515-24X · access20 × 25G
S9510-30XC · uplinks2 × 100G
S9510-30XC · access28 × 25G
BCM88280 die~360 Gbps
Same silicon, two assembly choices. Pick the platform with the access:uplink ratio that matches your edge role.
Four design choices that matter

Why Q2U is the right shape for cell-site and Tier-3 edge.

Smaller than Q2A — but every SP feature you need at the access still lights up.

PRINCIPLE 01

Right-sized for the access.

~360 Gbps in 1RU short-depth fits the cabinet density of cell-site rooms, FTTx pre-aggregation huts, and outdoor enclosures where Q2A or J2C+ would be overkill — both physically and on per-port economics.

~360 Gbps · short-depth
PRINCIPLE 02

Hardware PTP Class C.

IEEE 1588v2 Class C accuracy on every port (~82 ns phase). Full G.8275.1 mobile profile. Boundary clock, transparent clock, ordinary clock modes. Sufficient for 5G fronthaul timing budgets.

±82 ns · 1588v2
PRINCIPLE 03

Full Q-family SP DNA.

Same StrataDNX architecture as Q2A and J2C+. The OcNOS-SP image runs identically — every SP feature category lights up where the silicon supports it. No "compact NOS" for the small box.

StrataDNX family
PRINCIPLE 04

Two port-mix options.

The two validated platforms differ in port assembly — AS7515-24X is uplink-heavy (4 × 100G), S9510-30XC is access-heavy (28 × 25G). Same silicon underneath. Pick the assembly that matches the role.

2 assemblies · 1 chip
03
The Q-Family Map
Where Q2U sits in the StrataDNX line

Compact edge → metro aggregation → carrier core.

The same OcNOS-SP image runs end-to-end across the Q-family and J-family. Pick silicon by role; the NOS layer doesn't change.

QUMRAN 2U · BCM88280

Compact SP CSR.

You are here. ~360 Gbps. 1RU short-depth. Cell-site gateway, FTTx pre-aggregation, Tier-3 metro edge.

~360 Gbps · 1RU
QUMRAN 2A · BCM88483

SP edge with deep buffer + 400G ZR.

Step up. 800 Gbps with 2 × 400G QSFP-DD coherent-ready cages. Metro aggregation hub. Q2A page →

800 Gbps · 1RU
QUMRAN 2C · BCM88480

Larger metro hub.

Higher 100G/400G port density. Same Q-family deep buffer + timing. Use when access-side density grows beyond Q2A.

2.0 Tbps · 1RU
JERICHO 2C+ · BCM88850

Carrier-core router.

7.2 Tbps single-chip / 14.4 Tbps dual. Internet-scale FIB. Sit Q2U in front of it as the access edge. J2C+ page →

7.2–14.4 Tbps · 2RU
04
What OcNOS-SP Ships
OcNOS-SP on this silicon

The same SP image as the metro core. Compact form, no compromise.

Q2U is not a "lite" version — every OcNOS-SP feature category is available where the silicon supports it. The compact 1RU box runs the same image as the carrier-core J2C+ two boxes upstream.

SR-MPLS · BGP-LU

Segment Routing-MPLS native, full IP/MPLS plane.

SR-MPLS with TI-LFA fast reroute, BGP-LU into the metro core, RSVP-TE for legacy interop. EVPN-MPLS for multi-tenant L2/L3VPN at the edge. Full L3VPN VPNv4/v6 with route reflectors.

PTP / SyncE

1588v2 Class C + G.8275.1.

Hardware PTP on every port, full SyncE with ESMC SSM, hold-over support. Boundary clock, transparent clock, hybrid mode. 5G fronthaul timing budget closes in the box.

MACsec

IEEE 802.1AE line-rate.

AES-GCM 256, EAPoL-MKA, hitless rekey. Mandatory in many SP fronthaul/backhaul deployments.

Hierarchical QoS

Per-subscriber shaping.

HQoS for FTTH/BNG aggregation. Multi-level scheduling, ETS, weighted fair queueing — the SP edge actually needs more sophisticated QoS than the DC fabric.

L3 Routing

BGP · IS-IS · OSPF.

Full SP routing stack. BGP with BMP, RPKI, GR/LLGR. SR-IS-IS or SR-OSPF for the underlay.

Validated feature surface

Same OcNOS-SP image as Q2A and J2C+.

One configuration model from the cell-site to the core. Same automation, same telemetry, same operational team.

SR-MPLS / TI-LFA BGP-LU EVPN-MPLS L3VPN PTP G.8275.1 SyncE G.8262 MACsec HQoS gNMI / NETCONF
Day-0 to Day-2

ZTP · gNMI · NETCONF · PTP visibility.

Bring up a cell-site Q2U over zero-touch provisioning. Stream PTP phase error, SyncE clock-class, BGP route counts. The edge becomes observable like the rest of the SP fabric.

ZTP IPv4/IPv6 gNMI NETCONF OpenConfig YANG Ansible
Who builds this stack

Three operator profiles. One compact SP edge silicon.

Q2U appears in three different SP architectures — mobile, broadband, industrial — each leveraging different sides of the same chip.

Mobile · 5G Cell-Site

20-cell aggregation with timing in the box.

"We need a cell-site gateway that aggregates 20 5G cells at 25G into 100G uplinks to the metro core. PTP/SyncE timing is a hard requirement. Outdoor cabinet space is limited."

AS7515-24X (20 × 25G access + 4 × 100G uplinks) sits in the cabinet. PTP Class C and SyncE on every port — G.8275.1 mobile profile. Same OcNOS-SP image as the core. Short-depth 1RU fits.

SP · 5G Cell-Site
Broadband · FTTH Pre-Aggregation

Higher access density for OLT aggregation.

"We need to aggregate 28 access-side ports from OLTs/DSLAMs into the metro. Two 100G uplinks are enough — but we don't want to pay for 400G silicon we won't use."

S9510-30XC (28 × 25G + 2 × 100G) sized for FTTH pre-aggregation. HQoS for per-subscriber shaping, BGP-LU into core, EVPN-MPLS for tenant separation.

SP · FTTH Pre-Agg
Industrial · TSN

Substation automation with deterministic latency.

"Our power utility runs IEC 61850 GOOSE messaging across substations. We need TSN (IEEE 802.1Q-2018) for deterministic latency — and we don\'t want to deploy single-purpose industrial switches."

S9510-30XC supports TSN forwarding alongside standard SP routing. Same box does substation aggregation and metro-edge routing. PTP timing aligns the protection-relay clock domain.

SP · Industrial · TSN
Full Feature Matrix SP Networks Solution SR-MPLS Deep-Dive Hardware Compatibility List
Frequently Asked

The questions SP edge architects ask.

Two open-hardware short-depth 1RU platforms with different port mixes: Edgecore AS7515-24X (20 × 25G + 4 × 100G — uplink-heavy, sized for cell-site aggregation) and UfiSpace S9510-30XC (28 × 25G + 2 × 100G — access-heavy, sized for larger pre-aggregation). Both run BCM88280 silicon, both ship ONIE pre-loaded, both run the same OcNOS-SP image — pick by port mix for the role.
Same chip, different topology. AS7515-24X has 20 × 25G access + 4 × 100G uplinks — the right shape for a cell-site gateway aggregating 20 5G cells with high-capacity uplinks to the metro core. S9510-30XC has 28 × 25G access + 2 × 100G uplinks — the right shape for a pre-aggregation hub where you need more drops and fewer uplinks. Decision rule: count the uplinks you need into the metro core, then pick the platform with the matching ratio.
Q2U is the compact / Tier-3 SP edge. ~360 Gbps capacity, no 400G, smaller power envelope, fanless options on some hardware. Q2A is the deep-buffer / 400G ZR-ready aggregation step up — 800 Gbps with 2 × 400G QSFP-DD coherent-ready cages. Pick Q2U when the role is cell-site gateway, FTTx pre-aggregation, or Tier-3 metro edge below 200 Gbps. Pick Q2A when you need 400G uplinks or deeper buffer. Same OcNOS-SP image runs on both.
Yes. IEEE 1588v2 Class C accuracy on every port (sub-100 ns phase), full SyncE per ITU-T G.8262, ESMC SSM messaging, boundary clock and transparent clock modes. Sufficient for ITU-T G.8275.1 mobile fronthaul timing budgets. The S9510-30XC also adds TSN / IEEE 802.1Q time-sensitive forwarding for industrial and utility deployments where deterministic latency matters.
Yes — that's a primary use case. Connect each radio (gNodeB) at 25G into the access side. Aggregate 20–28 cells per box. Uplink at 100G into the metro Q2A or J2C+ core. PTP/SyncE timing distributes across the access side; the cell-site gateway absorbs O-RAN fronthaul jitter and meets G.8275.1 phase budgets. OcNOS-SP ships with IPRAN profile defaults aligned to 5G O-RAN deployments.
For metro core or DCI roles (capacity is too low — use Q2A or J2C+). For DC fabric (no DC-class shared-buffer, no RoCEv2 — use Trident or Tomahawk). For 400G uplinks (Q2U doesn't have 400G ports — Q2A does). Q2U's sweet spot is "compact SP edge / cell-site / Tier-3 metro" where the port mix is access-heavy 25G with a couple of 100G uplinks.
Full carrier-grade routing — BGP, BGP-LU, IS-IS, OSPF, SR-MPLS with TI-LFA, RSVP-TE, LDP, L2VPN/L3VPN MPLS services, EVPN-MPLS, hierarchical QoS. Plus timing — IEEE 1588v2 Class C, SyncE G.8262, G.8275.1 mobile profile. Plus security — MACsec line-rate AES-GCM 256. Plus standard automation — gNMI, NETCONF, OpenConfig YANG, ZTP. The compact 1RU box runs the same SP image as the metro core router two boxes upstream.

Sizing a 5G cell-site or FTTH pre-aggregation edge?

30-minute architecture session with an OcNOS network architect. Bring your access-side count, uplink expectations, and timing budget — leave with a sized BoM around AS7515-24X / S9510-30XC.

Book an Architecture Review Test Drive OcNOS-SP