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If you want to buy MSTP equipment at telecomate.com. but do not know how to choose the right one, please read this article. Common MSTP devices are OSN 500, 1500B, 3500, 7500. The introduction and configuration comparison of these devices as follow:
What is the MSTP device?
The OptiX OSN serie intelligent optical transmission system (MSTP) developed by Huawei is the intelligent optical transmission equipment.
The OptiX OSN serie is of a “universal switch” architecture. That is, the OptiX OSN serie can be used in packet mode or in TDM mode. When used with the other equipment of Huawei, the OptiX OSN serie supports various networking applications, such as the pure packet mode application, hybrid networking application (overlay networking of the packet mode and TDM mode), and pure TDM mode application. By using a proper networking solution, the data service and conventional SDH service can be processed in the optimal manner.
The OptiX OSN serie transmits voice and data services on the same platform with high efficiency. It integrates the following technologies:
In packet mode, the OptiX OSN 3500 supports the following technologies:

• Multiprotocol Label Switching (MPLS)
• Multiprotocol Label Switching Transport Profile (MPLS-TP)
• Pseudo Wire Edge to Edge Emulation (ETH PWE3)
• TDM PWE3
• ATM PWE3

In TDM mode, the OptiX OSN 3500 supports the following technologies:

• Synchronous digital hierarchy (SDH)
• Plesiochronous digital hierarchy (PDH)
• Ethernet
• Asynchronous transfer mode (ATM)
• Storage area network (SAN)/Video
• Wavelength division multiplexing (WDM)
• Digital data network (DDN)

What are the similarities and differences of these devices?

Product name	OSN 500	OSN 1500B	OSN 3500	OSN 7500
Mode	Packet-oriented	Packet- and TDM-oriented	Packet- and TDM-oriented	Packet- and TDM-oriented
Applicable Layer	Access layer	Access layer	Convergence layer and backbone layer	Backbone layer
Topology	Point-to-point, chain, star, ring, ring with chain, intersecting rings, tangent rings	Point-to-point, chain, star, ring, ring with chain, intersecting rings, tangent rings	Point-to-point, chain, star, ring, ring with chain, intersecting rings, tangent rings	Point-to-point, chain, star, ring, ring with chain, intersecting rings, tangent rings
Dimensions (H x W x D)	44 mm x 442 mm x 220 mm	221 mm x 444 mm x 263 mm	722 mm x 497 mm x 295 mm	756.7 mm x 496.4 mm x 295 mm
Number of Valid Slots	2 (excluding the slots for system control, switching, and time boards)/3 (including the slots for system control, switching, and time boards)	12 for processing boards and 4 for interface boards	15 for processing boards and 16 for interface boards	22 for processing boards and 8 for interface boards
Packet Capacity	7.2Gbit/s	8Gbit/s	160Gbit/s	160Gbit/s
TDM Capacity	N	Higher order: 60Gbit/s Lower order: 20Gbit/s	Higher order: 200Gbit/s Lower order: 20Gbit/s	Higher order: 360Gbit/s Lower order: 40Gbit/s
OTN Capacity	N	N	N	N
Service Type	ATM CES Ethernet	SDH PDH ATM CES Ethernet PCM SAN video	SDH PDH ATM CES Ethernet PCM SAN video	SDH PDH ATM CES Ethernet PCM SAN video
Smart Line Board	N	N	HSNS3: 40 Gbit/s for a single optical port	HSNS3: 40 Gbit/s for a single optical port
Tunnel APS	Y(1:1)	Y	Y	Y
PW APS	Y(1:1)	Y	Y	Y
PW FPS	Y(1:1)	N	Y	Y
Packet-based Linear MSP	Y	N	Y	Y
LPT	Y	Y	Y	Y
LAG	Y	Y	Y	Y
MC-LAG	N	N	Y	Y
MSTP	Y	Y	Y	Y
MRPS	Y	N	Y	Y
ML-PPP	Y	N	N	N
ERPS	Y	N	N	N
LMSP	N	Y	Y	Y
RMSP	N	Y	Y	Y
SNCP	N	Y	Y	Y
E1 SNCP	N	Y	Y	Y
LCAS	N	Y	Y	Y
LPT	N	Y	Y	Y
STP/RSTP	N	Y	Y	Y
MSTP	N	Y	Y	Y
ERPS	N	N	Y	Y
RPR	N	Y	Y	Y
LAG	N	Y	Y	Y
DLAG	N	Y	Y	Y
Device-level Protection
BPS	N	Y	Y	Y
PPS	N	Y	Y	Y
TPS	N	Y	Y	Y
1+1 Protection for the System Control, Switching, and Timing Board	N	Y	Y	Y
1+1 Protection for the Power Supply Board	Y	Y	Y	Y
Fan Protection	Y	Y	Y	Y
MPLS OAM	CV FFD Ping Traceroute	CV FFD Ping Traceroute	CV FFD Ping Traceroute	CV FFD Ping Traceroute
MPLS-TP OAM	CC RDI AIS LB LT LM (PW-based single-ended LM only) DM (two-way DM only) TST(packet loss test only) PW CSF	N	CC RDI AIS LB LT LM (PW-based single-ended LM only) DM LCK (The LCK for PWs and bidirectional tunnels is supported) TST PW CSF	CC RDI AIS LB LT LM (PW-based single-ended LM only) DM LCK (The LCK for PWs and bidirectional tunnels is supported) TST PW CSF
Ethernet Service OAM (Packet)	CC LB LT AIS LM (single-ended LM only) DM (two-way DM only) RDI	CC LB LT LM (single-ended LM only) DM (two-way DM only)	CC LB LT LM (single-ended LM only) DM (two-way DM only)	CC LB LT LM (single-ended LM only) DM (two-way DM only)
Ethernet Port OAM (Packet)	OAM auto-discovery link performance monitoring remote loopback fault detection self-loop detection	OAM auto-discovery link performance monitoring remote loopback fault detection self-loop detection	OAM auto-discovery link performance monitoring remote loopback fault detection self-loop detection	OAM auto-discovery link performance monitoring remote loopback fault detection self-loop detection
Ethernet Service OAM (TDM)	N	CC LB LT OAM_Ping	CC LB LT OAM_Ping	CC LB LT OAM_Ping
Ethernet Port OAM (TDM)	N	OAM auto-discovery link performance monitoring remote loopback fault detection self-loop detection	OAM auto-discovery link performance monitoring remote loopback fault detection self-loop detection	OAM auto-discovery link performance monitoring remote loopback fault detection self-loop detection
TP-Assist	Y	N	Y	Y
SDH Synchronization Clocks	N	Y	Y	Y
Synchronous Ethernet Clock	Y	Y	Y	Y
IEEE 1588v2	N	N	Y	Y
IEEE 1588 ACR	Y	N	N	N
CES ACR	Y	Y	Y	Y
HWECC	N	Y	Y	Y
IP over DCC	N	Y	Y	Y
OSI over DCC	N	Y	Y	Y
Inband DCN	Y	Y	Y	Y
Temperature	Long-time operation: -5ºC～55ºC Extended operation: -5ºC～65ºC	Long-time operation: 0ºC～45ºC Extended operation: -5ºC～55ºC	Long-time operation: 0ºC～45ºC Extended operation: -5ºC～55ºC	Long-time operation: 0ºC～45ºC Extended operation: -5ºC～55ºC
Humidity	Long-time operation: 5-85% Short-time operation: 5-95%	Long-time operation: 5-85% Short-time operation: 5-95%	Long-time operation: 5-85% Short-time operation: 5-95%	Long-time operation: 5-85% Short-time operation: 5-95%
Standard Working Voltage	-48 V/-60 V DC power input	-48 V/-60 V DC power input	-48 V/-60 V DC power input	-48 V/-60 V DC power input
Mean Time to Resolution (MTTR)	1 h	1 h	1 h	1 h
Mean Time Between Failures (MTBF)	51.1 year	49.02 year	31.45 year	45.42 year

OSN 500 is a small but fully functional device that can basically meet the needs of small businesses, but other models of equipment have many business slots and can meet greater needs. Even OSN 7500 also has the function of wavelength division. Through the comparison of the above data, we know the similarities and differences of these MSTP devices, so we can choose the right product according to our needs.