Does C9300-48UB-E keep PoE running during a reload?

Yes, with Perpetual PoE. It holds power to the powered devices through a soft reload such as an upgrade, a crash or a manual reboot, and across a stack. It does not cover power loss. Fast PoE restores power in under 30 seconds from stored power and requires the perpetual-poe-ha setting on the port.

What happens when a 90W Type 4 device connects to a UPOE port on C9300-48UB-E?

The device is demoted to Type 3 operation, because the port is an 802.3bt Type 3 source with 60W at the port. A Class 6 device then receives 51W after cable loss. Per the Catalyst 9300 datasheet, 90W delivery requires a UPOE+ port, which this switch does not have.

Is ThousandEyes bundled with a C9300-DNA-E-48-5Y Essentials term for C9300-48UB-E?

No. TE-EMBEDDED-T, the ThousandEyes Network and Application Synthetics license, is included only with 3-, 5- or 7-year Advantage subscriptions on the Catalyst 9300. An Essentials term for C9300-48UB-E does not carry it, and the license term cannot be added to the switch order.

How many NetFlow flows and IGMP entries does C9300-48UB-E support?

C9300-48UB-E supports 128,000 NetFlow flows and 16,000 IGMP entries, with 48,000 host routes. Per the Catalyst 9300 datasheet, these are the scale figures of the higher-scale UADP 2.0 XL group, which this model belongs to. The packet buffer is 32 MB.

Which power supplies besides PWR-C1-1100WAC-P fit C9300-48UB-E, and what redundancy applies?

Catalyst 9300 chassis take 350W AC, 715W AC, 715W DC, 1100W AC and 1900W AC supplies. Each switch holds two supplies in an N+1 arrangement. All are Platinum-rated at 90% efficiency except the DC unit, which is Gold-rated. Per the Cisco datasheet, the supply PIDs end in -P for the Platinum AC models.

How is the 480 Gbps StackWise-480 bandwidth of C9300-48UB-E built?

StackWise-480 uses 6 rings of 40 Gbps each, which add up to the 480 Gbps stack bandwidth. A stack holds up to 8 members. Every member must run the same license tier, so Network Essentials and Network Advantage switches cannot share a stack. Per the Catalyst 9300 datasheet, plan the ring cabling with that limit in mind.

C9300-48UB-E – 48x1G UPOE Ports – Higher-Scale Buffer – 822W PoE Budget

Name: C9300-48UB-E - Cisco Higher-Scale 48-Port UPOE Essentials Switch
Brand: Cisco
SKU: C9300-48UB-E
Price: 7981.00 USD
Availability: InStock
Rating: 4.9 (10 reviews)

Brand: Cisco Category: Catalyst 9300 Switches Availability:

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Model: C9300-48UB-E

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Rated 4.9 out of 5 based on 10 customer ratings

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C9300-48UB-E Description

The C9300-48UB-E is a Cisco Catalyst 9300 Series higher-scale stackable access switch for campus closets that power phones and access points over Cisco UPOE. The switch has 48 10/100/1000 UPOE ports, a modular uplink slot, an 822W default PoE budget, a 32 MB packet buffer and 64,000 MAC addresses. It stacks only with other higher-scale members, and its -E suffix carries Network Essentials, which limits OSPF to 1,000 routes and omits VXLAN, MPLS and MACsec-256.

Quick Specs

Parameter	Specification
Product ID	C9300-48UB-E
Product type	Higher-scale stackable access switch with modular uplinks
Downlink ports	48 x 10/100/1000 Mbps Cisco UPOE copper ports
Scale profile	Catalyst 9300 higher-scale model
Packet buffer	32 MB for higher-scale Gigabit Ethernet models
Uplink architecture	Modular uplink slot with C9300-NM-8X default order selection
Network license	Network Essentials
Default power supply	PWR-C1-1100WAC-P
Default PoE budget	822W
Stacking and StackPower	StackWise-480 with StackPower support
Expanded PoE budget	1800W with supported secondary power supply configuration
Switching and forwarding	256 Gbps standalone switching; 190.48 Mpps standalone forwarding

Product Performance

Higher-Scale UPOE Access

Gigabit Ethernet Packet Buffer

Switching Capacity With Stacking

Key Features

Higher-Scale Resource Profile

The hardware holds 64,000 MAC addresses, 112,000 IPv4 routes and 56,000 IPv6 routing entries, about twice the MAC scale of standard Catalyst 9300 modular-uplink models.

32 MB Packet Buffer

The deeper buffer helps absorb bursts from uplinks and multicast traffic compared with the 16 MB buffer on standard gigabit models.

48 Cisco UPOE Ports

All 48 gigabit copper ports can deliver Cisco UPOE at up to 60W for access points, displays and thin clients.

822W Default PoE Budget

The default 1100W supply leaves 822W for PoE. A second supply raises the budget to 1800W when more ports carry high-draw devices.

Network Essentials Licensing

The -E suffix covers Layer 2, routed access with OSPF up to 1,000 routes, 802.1X and MACsec-128. An upgrade to Network Advantage is a license purchase, not a hardware change.

Stacks Only With Higher-Scale Members

StackWise-480 joins up to eight switches, but every member must be a higher-scale model: C9300-24UB-E, C9300-24UXB-E or C9300-48UB-E.

Application Scenarios

Large Access Closet With Many Clients

In a campus building where one closet serves hundreds of wired and wireless clients, the 64,000-entry MAC table and 32 MB buffer give the 48-port UPOE switch room to grow.

Routed Access Without Advanced Features

A site that routes at the access layer with OSPF within 1,000 routes can run the switch on Network Essentials without needing VXLAN or MPLS.

Adding To A Higher-Scale Stack

A closet already built from higher-scale Catalyst 9300 switches can take the switch as another StackWise-480 member.

Product Comparison

Parameter	C9300-48UB-E	C9300-48UB-A	C9300-48U-E	C9300-24UB-E
Downlink ports	48 x 10/100/1000 Mbps	48 x 10/100/1000 Mbps	48 x 10/100/1000 Mbps	24 x 10/100/1000 Mbps
PoE type	Cisco UPOE	Cisco UPOE	Cisco UPOE	Cisco UPOE
Available PoE power (default supply)	822W	822W	822W	830W
Maximum PoE power (second supply)	1800W	1800W	1800W	1440W
Network license	Network Essentials	Network Advantage	Network Essentials	Network Essentials
Packet buffer	32 MB	32 MB	16 MB	32 MB
MAC addresses	64,000	64,000	32,000	64,000
IPv4 routes	112,000	112,000	32,000	112,000
Switching capacity	256 Gbps	256 Gbps	256 Gbps	208 Gbps

C9300-48UB-E and C9300-48UB-A share the same 48 UPOE ports, 32 MB packet buffer and 822W default PoE budget; C9300-48UB-E carries Network Essentials, which limits OSPF to 1,000 routes and omits VXLAN, Cisco TrustSec and MACsec-256. When those are needed on day one, order C9300-48UB-A, while an installed C9300-48UB-E can be upgraded later with a C9300-48-E-A-3, -5 or -7 license, which cannot be placed on the switch order. The scale profile also separates this model from C9300-48U-E, which has a 16 MB buffer and 32,000 MAC addresses against 32 MB and 64,000 here and cannot join a higher-scale stack. A 24-port closet with an 830W default budget fits C9300-24UB-E.

PoE Power Planning

Planning Item	Cisco Confirmed Value	Order Impact
Default PoE budget	C9300-48UB-E is listed with 822W available PoE and PWR-C1-1100WAC-P as the default supply	Check endpoint load against the base power profile before adding secondary power
UPOE access class	C9300-48UB-E is a 48-port 10/100/1000 Mbps Cisco UPOE switch	Prevents accidental replacement with PoE+, UPOE+, data-only, or multigigabit access models
StackPower support	C9300-48UB-E supports StackPower	Add StackPower cables only where the power-sharing design calls for them
Higher-scale stack group	C9300-48UB-E higher-scale SKUs need other higher-scale stack members	Keeps the powered-access plan aligned with the supported stack membership

Ordering Checklist

Subscription tier: Select an Essentials term such as C9300-DNA-E-48-5Y manually. The configurator defaults to Advantage with a 5-year term, which does not match a Network Essentials switch.
Uplink module: Keep the default C9300-NM-8X, pick another C9300-NM module, or select C9300-NM-NONE. The uplink slot must hold a module or a blank; C9300X-NM modules do not fit a C9300 chassis.
Second power supply: A second PWR-C1-1100WAC-P is selected by default and C9300-SPS-NONE removes it. Removing it leaves one supply, so there is no power redundancy and no added PoE headroom.
Stack cables: The default 50 cm StackWise cable (C9300-STACK-NONE removes it) and 30 cm StackPower cable (C9300-SPWR-NONE removes it) ship on the order. A stack that needs longer or no cables must change these lines, or the cables ship anyway.
Power cords: Select the cord type for the destination country. The configurator defaults to North America, and two cords ship with the switch.

Optional Add-ons

Model	Description
C9300-NM-4G	Catalyst 9300 4 x 1GE SFP network module
C9300-NM-8X	Catalyst 9300 8 x 10G/1G SFP+ network module
C9300-NM-2Q	Catalyst 9300 2 x 40G network module
C9300-NM-2Y	Catalyst 9300 2 x 25G/10G/1G network module
C9300-NM-4M	Catalyst 9300 4 x 10G/mGig copper network module
NM-BLANK-T1=	Cisco Catalyst Type 1 network module blank spare
C9300-DNX-E-48-3Y	C9300 Cisco Catalyst Essentials 48-port 1G copper 3 Year Term license
C9300-DNX-E-48-5Y	C9300 Cisco Catalyst Essentials 48-port 1G copper 5 Year Term license
C9300-DNX-E-48-7Y	C9300 Cisco Catalyst Essentials 48-port 1G copper 7 Year Term license
PWR-C1-1100WAC-P=	1100W AC Platinum-rated power supply spare
STACK-T1-50CM=	Cisco StackWise-480/1T 50 cm stacking cable spare
STACK-T1-1M=	Cisco StackWise-480/1T 1 m stacking cable spare
STACK-T1-3M=	Cisco StackWise-480/1T 3 m stacking cable spare
CAB-SPWR-30CM=	Cisco Catalyst StackPower cable 30 cm spare
CAB-SPWR-150CM=	Cisco Catalyst StackPower cable 150 cm spare

C9300-48UB-E Switch Rear Panel

The switch rear panel includes StackWise connectors, StackPower or XPS connectors, ports, fan modules, and power supply modules.

1	Ground connectors	7	StackPower connectors
2	USB3.0–SSD port	8	AC OK (input) status LED
3	BEACON LED	9	PS OK (output) status LED
4	CONSOLE (RJ-45 console port)	10	StackWise-480 port connectors
5	MGMT (RJ-45 10/100/1000 management port)	11	Power supply modules
6	Fan modules	–	–

Rear Panel of a Cisco Catalyst 9300 Series Switch

Components Delivered in the Shipping Box

The shipping box contains the model of the switch you ordered and other components needed for installation. Some components are optional, depending on your order.

1	Cisco Catalyst 9300 Series switch with optional network module¹ (power supply and fan modules not shown)	9	Eight number-8 Phillips flat-head screws
2	AC power cord	10	Cable guide
3	Product documentation and compliance document	11	M4.0 x 20mm Phillips pan-head screw
4	Four rubber mounting feet	12	(Optional) RJ-45 console cable
5	Ground lug screw and ring terminal	13	(Optional) USB console cable
6	Two 19-inch mounting brackets	14	(Optional) StackWise-480/1T cable (0.5-meter, 1-meter, or 3-meter)
7	Four number-12 pan-head screws	15	(Optional) StackPower cable (0.3-meter or 1.5-meter)
8	Four number-10 pan-head screws	16	(Optional) StackWise-320 cable

Specifications

Parameter	Specification	Parameter	Specification
Product ID	C9300-48UB-E	Product type	Higher-scale stackable access switch with modular uplinks
Network license	Network Essentials	Downlink ports	48 x 10/100/1000 Mbps Cisco UPOE copper ports
Scale profile	Catalyst 9300 higher-scale model	Default power supply	PWR-C1-1100WAC-P
Default PoE budget	822W	Uplink architecture	Optional field-replaceable C9300 network module
Default network module selection	C9300-NM-8X by default for C9300 modular uplink SKUs; alternate module or no-module selection is available	Supported network modules	C9300-NM-4G, C9300-NM-8X, C9300-NM-2Q, C9300-NM-2Y, C9300-NM-4M
Stacking architecture	StackWise-480	Stack members	Higher-scale C9300 models only
Stack bandwidth	480 Gbps	StackPower	Supported
Minimum software release	Cisco IOS XE Gibraltar 16.12.1	Packet buffer	32 MB
Flexible NetFlow entries	128,000 flows for higher-scale Gigabit Ethernet models	MAC addresses	64,000
IPv4 routes	112,000 total routes	IPv6 routes	56,000
Multicast routes	16,000	QoS entries	18,000
ACL entries	18,000	Switching capacity	256 Gbps standalone
Switching capacity with stacking	736 Gbps	Forwarding rate	190.48 Mpps standalone
Forwarding rate with stacking	547.62 Mpps	DRAM	8 GB
Flash	16 GB	VLAN IDs	4094
Jumbo frames	9198 bytes	MTBF	337,170 hours
Dimensions	1.73 x 17.5 x 19.2 in. (4.4 x 44.5 x 48.8 cm)	Weight	7.72 kg (17.03 lb)

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Questions & Answers

Does C9300-48UB-E keep PoE running during a reload?
Yes, with Perpetual PoE. It holds power to the powered devices through a soft reload such as an upgrade, a crash or a manual reboot, and across a stack. It does not cover power loss. Fast PoE restores power in under 30 seconds from stored power and requires the perpetual-poe-ha setting on the port.
What happens when a 90W Type 4 device connects to a UPOE port on C9300-48UB-E?
The device is demoted to Type 3 operation, because the port is an 802.3bt Type 3 source with 60W at the port. A Class 6 device then receives 51W after cable loss. Per the Catalyst 9300 datasheet, 90W delivery requires a UPOE+ port, which this switch does not have.
Is ThousandEyes bundled with a C9300-DNA-E-48-5Y Essentials term for C9300-48UB-E?
No. TE-EMBEDDED-T, the ThousandEyes Network and Application Synthetics license, is included only with 3-, 5- or 7-year Advantage subscriptions on the Catalyst 9300. An Essentials term for C9300-48UB-E does not carry it, and the license term cannot be added to the switch order.
How many NetFlow flows and IGMP entries does C9300-48UB-E support?
C9300-48UB-E supports 128,000 NetFlow flows and 16,000 IGMP entries, with 48,000 host routes. Per the Catalyst 9300 datasheet, these are the scale figures of the higher-scale UADP 2.0 XL group, which this model belongs to. The packet buffer is 32 MB.
Which power supplies besides PWR-C1-1100WAC-P fit C9300-48UB-E, and what redundancy applies?
Catalyst 9300 chassis take 350W AC, 715W AC, 715W DC, 1100W AC and 1900W AC supplies. Each switch holds two supplies in an N+1 arrangement. All are Platinum-rated at 90% efficiency except the DC unit, which is Gold-rated. Per the Cisco datasheet, the supply PIDs end in -P for the Platinum AC models.
How is the 480 Gbps StackWise-480 bandwidth of C9300-48UB-E built?
StackWise-480 uses 6 rings of 40 Gbps each, which add up to the 480 Gbps stack bandwidth. A stack holds up to 8 members. Every member must run the same license tier, so Network Essentials and Network Advantage switches cannot share a stack. Per the Catalyst 9300 datasheet, plan the ring cabling with that limit in mind.

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C9300-48UB-E – 48x1G UPOE Ports – Higher-Scale Buffer – 822W PoE Budget

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C9300-48UB-E Description

Quick Specs

Product Performance

Key Features

Application Scenarios

Product Comparison

PoE Power Planning

Ordering Checklist

Optional Add-ons

C9300-48UB-E Switch Rear Panel

Components Delivered in the Shipping Box

Specifications

Get More Information

Quality Certifications

Customer Reviews

Questions & Answers

Does C9300-48UB-E keep PoE running during a reload?

What happens when a 90W Type 4 device connects to a UPOE port on C9300-48UB-E?

Is ThousandEyes bundled with a C9300-DNA-E-48-5Y Essentials term for C9300-48UB-E?

How many NetFlow flows and IGMP entries does C9300-48UB-E support?

Which power supplies besides PWR-C1-1100WAC-P fit C9300-48UB-E, and what redundancy applies?

How is the 480 Gbps StackWise-480 bandwidth of C9300-48UB-E built?

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