Figure 1 shows the appearance of HPE J9821A with installed modules. These modules should be purchased separately.

Table 1 shows the quick spec.
| 
			 Product Number  | 
			
			 J9821A  | 
		
| 
			 Type  | 
			
			 HPE 5406R zl2 Switch  | 
		
| 
			 Included accessories  | 
			
			 1 HPE 5400R zl2 Management Module (J9827A) 1 HPE 5406R zl2 Switch Fan Tray (J9831A)  | 
		
| 
			 I/O ports and slots  | 
			
			 6 open module slots Supports a maximum of 144 autosensing 10/100/1000 ports or 144 SFP ports or 48 SFP+ ports or 48 HPE Smart Rate Multi-Gigabit or 12 40GbE ports, or a combination  | 
		
| 
			 Power supplies  | 
			
			 2 power supply slots 1 minimum power supply required (ordered separately)  | 
		
| 
			 Fan Tray  | 
			
			 Includes: 1 x J9831A 1 fan tray slot  | 
		
| 
			 Dimensions (W x D x H)  | 
			
			 17.5(w) x 17.75(d) x 6.9(h) in. (44.45 x 45.09 x 17.53 cm) (4U height)  | 
		
| 
			 Weight  | 
			
			 24.5 lb (11.11 kg)  | 
		
Figure 2 shows the front view of HPE J9821A with installed modules. These modules should be purchased separately.
 
Figure 3 shows the back view of HPE J9821A with installed modules. These modules should be purchased separately.

Table 2 shows the comparison.
| 
			 Product Code  | 
			
			 J9821A  | 
			
			 J9822A  | 
		
| 
			 Type  | 
			
			 HPE 5406R zl2 Switch  | 
			
			 HPE 5412R zl2 Switch  | 
		
| 
			 Included accessories  | 
			
			 1 HPE 5400R zl2 Management Module (J9827A) 1 HPE 5406R zl2 Switch Fan Tray (J9831A)  | 
			
			 1 HPE 5400R zl2 Management Module (J9827A) 1 HPE 5412R zl2 Switch Fan Tray (J9832A)  | 
		
| 
			 I/O ports and slots  | 
			
			 6 open module slots Supports a maximum of 144 autosensing 10/100/1000 ports or 144 SFP ports or 48 SFP+ ports or 48 HPE Smart Rate Multi-Gigabit or 12 40GbE ports, or a combination  | 
			
			 12 open module slots Supports a maximum of 288 autosensing 10/100/1000 ports or 288 SFP ports or 96 SFP+ ports or 96 HPE Smart Rate Multi-Gigabit or 24 40GbE ports, or a combination  | 
		
| 
			 Power supplies  | 
			
			 2 power supply slots 1 minimum power supply required (ordered separately)  | 
			
			 4 power supply slots 2 minimum power supplies required (ordered separately)  | 
		
| 
			 Fan Tray  | 
			
			 Includes: 1 x J9831A 1 fan tray slot  | 
			
			 Includes: 1 x J9832A 1 fan tray slot  | 
		
			J9821A Specification | 
		|
| 
			 Type  | 
			
			 HPE 5406R zl2 Switch  | 
		
| 
			 Included accessories  | 
			
			 1 HPE 5400R zl2 Management Module (J9827A) 1 HPE 5406R zl2 Switch Fan Tray (J9831A)  | 
		
| 
			 I/O ports and slots  | 
			
			 6 open module slots Supports a maximum of 144 autosensing 10/100/1000 ports or 144 SFP ports or 48 SFP+ ports or 48 HPE Smart Rate Multi-Gigabit or 12 40GbE ports, or a combination  | 
		
| 
			 Power supplies  | 
			
			 2 power supply slots 1 minimum power supply required (ordered separately)  | 
		
| 
			 Fan Tray  | 
			
			 Includes: 1 x J9831A 1 fan tray slot  | 
		
| 
			 Dimensions (W x D x H)  | 
			
			 17.5(w) x 17.75(d) x 6.9(h) in. (44.45 x 45.09 x 17.53 cm) (4U height)  | 
		
| 
			 Weight  | 
			
			 24.5 lb (11.11 kg)  | 
		
| 
			 Memory and processor  | 
		|
| 
			 v3 Gigabit Module  | 
			
			 Dual ARM® Coretex A9 @ 1 GHz; Packet buffer size: 13.5 MB internal  | 
		
| 
			 v2 Gigabit Module  | 
			
			 ARM 11 @ 450 MHz; Packet buffer size: 18 MB internal  | 
		
| 
			 v3 10G Module  | 
			
			 Dual ARM Coretex A9 @ 1 GHz; Packet buffer size: 13.5 MB internal  | 
		
| 
			 v2 10G Module  | 
			
			 ARM 11 @ 550 MHz; Packet buffer size: 18 MB internal  | 
		
| 
			 v3 40G Module  | 
			
			 Dual ARM Coretex A9 @ 1 GHz; Packet buffer size: 13.5 MB internal  | 
		
| 
			 Management Module  | 
			
			 Freescale P2020 dual core @ 1.2 GHz, 16 MB flash, 1 GB SD Card, 4 GB DDR3 SODIMM  | 
		
| 
			 Mounting and enclosure  | 
			
			 Mounts in an EIA standard 19-inch telco rack or equipment cabinet (hardware included); Horizontal surface mounting only  | 
		
| 
			 Performance (IPv6 Ready Certified)  | 
		|
| 
			 1000 Mb Latency  | 
			
			 < 2.8 µs (FIFO 64-byte packets)  | 
		
| 
			 10 Gbps Latency  | 
			
			 < 1.8 µs (FIFO 64-byte packets)  | 
		
| 
			 40 Gbps Latency  | 
			
			 < 1.5 µs (FIFO 64-byte packets)  | 
		
| 
			 Throughput  | 
			
			 Up to 571.4 Mpps  | 
		
| 
			 Routing/Switching capacity  | 
			
			 960 Gbps  | 
		
| 
			 Switch fabric speed  | 
			
			 1015 Gbps  | 
		
| 
			 Routing table size  | 
			
			 10000 entries (IPv4), 5000 entries (IPv6)  | 
		
| 
			 MAC address table size  | 
			
			 64000 entries  | 
		
| 
			 Environment  | 
		|
| 
			 Operating temperature  | 
			
			 32°F to 113°F (0°C to 45°C); 0°C to 40°C with J8177C transceiver installed, 0°C to 35°C with FIPS Opacity Shield installed  | 
		
| 
			 Operating relative humidity  | 
			
			 15% to 95% @ 113°F (45°C), noncondensing  | 
		
| 
			 Nonoperating/Storage temperature  | 
			
			 -40°F to 158°F (-40°C to 70°C)  | 
		
| 
			 Nonoperating/Storage relative humidity  | 
			
			 15% to 95% @ 149°F (65°C), noncondensing  | 
		
| 
			 Altitude  | 
			
			 Up to 10,000 ft (3 km)  | 
		
| 
			 Acoustic  | 
			
			 Power: 44 dB, Pressure: 31.7 dB ISO 7779, ISO 9296  | 
		
| 
			 Electrical characteristics  | 
		|
| 
			 Frequency  | 
			
			 50/60 Hz  | 
		
| 
			 80plus.org Certification  | 
			
			 Gold  | 
		
| 
			 Description  | 
			
			 Does not come with power supply. Two power supply slots are available; three different power supplies are available. See power supply products for additional specifications.  | 
		
| 
			 Maximum heat dissipation  | 
			
			 2450 BTU/hr (2584 kJ/hr), (max. non-PoE); 3700 BTU/hr (3903 kJ/hr), (max. using PoE)  | 
		
| 
			 Voltage  | 
			
			 100–127/200–240 VAC, rated  | 
		
| 
			 Idle power  | 
			
			 (depending on power supply chosen)  | 
		
| 
			 Notes  | 
			
			 Heat dissipation does not include heat dissipated by the PoE-powered devices themselves.  | 
		
| 
			 Safety  | 
			
			 CSA 22.2 No. 60950; UL 60950; IEC 60950; EN 60950  | 
		
| 
			 Emissions  | 
			
			 FCC part 15 Class A; EN 55022/CISPR 22 Class A  | 
		
| 
			 Immunity EN ESD Radiated EFT/Burst Surge Conducted Power frequency magnetic field Harmonics Flicker  | 
			
			 EN 55024, CISPR 24 IEC 61000-4-2; 4 kV CD, 8 kV AD; HPE ENV. 765.002 IEC 61000-4-3; 3 V/m IEC 61000-4-4; 1.0 kV (power line), 0.5 kV (signal line) IEC 61000-4-5; 1 kV/2 kV AC, 1 kV signal, 0.5 kV DC IEC 61000-4-6; 3 Vrms IEC 61000-4-8; 1 A/m, 50 or 60 Hz IEC 61000-4-11; >95% reduction, 0.5 period; 30% reduction, 25 periods EN 61000-3-2, IEC 61000-3-2 EN 61000-3-3, IEC 61000-3-3  | 
		
| 
			 Management  | 
			
			 IMC—Intelligent Management Center; Command-line interface; Web browser; Configuration menu; Out-of-band management (RJ-45 Ethernet); SNMP Manager; Out-of-band management (serial RS-232C or micro USB) AirWave Network Management  | 
		
| 
			 Notes  | 
			
			 Supported 1G SFP transceivers are revision “B” or later (product number ends with the letter “B” or l ater; For example, J9142B, J8177C).  |