Evolution Series PD25L – A Cost-Effective and Reliable Modem Solution

The Evolution Series PD25L is a modem specifically designed to meet the demands of cost-critical applications in the field of satellite communication. Targeting discerning users who prioritize quality and reliability without compromising affordability, this modem offers a range of features to cater to diverse needs.

Key Features:

Data Rate and Frequency:
- Capable of supporting up to 25Mbps data rate.
- Operates in the L-band, a standard frequency range for satellite communication.
Compliance:
- Full compliance with International Earth Station Standards (IESS) including IESS-308, 309, 310, 314 & 315.
Data Interfaces:
- Provides a variety of data interfaces, including Ethernet.
Optional Integrated Features:
- Optional integrated BUC (Block Upconverter) / LNB (Low Noise Block) power supply.
- High-stability 10MHz reference integrated, streamlining system architecture.
Control Features:
- FSK (Frequency Shift Keying) control of the BUC available through the modem.
Programmable Logic:
- Core functions implemented with programmable logic, allowing easy reconfiguration based on user requirements.
- Future-proof flexibility to adapt to evolving needs.

The Evolution Series PD25L stands as a versatile solution, addressing the essential aspects of modem applications in satellite communication. Its compliance with industry standards, provision of multiple data interfaces, optional integrated features, and programmable logic make it a promising choice for users seeking reliability and adaptability in a cost-effective package.

Common Main Specifications

Parameter	Evolution Series Modem
ESC/Aux Port	A single port provides the interface for optional high rate
	async ESC (IBS/SMS option or Closed Net Plus ESC) or the
	Intelsat low rate async IBS ESC channel.
Electrical Interface	RS232, RS422 or RS485 external interfaces or internal link
	to remote M&C port (software selected). Other devices
	externally wired in parallel with M&C port can also be
	accessed remotely.
Async ESC Option	Closed Net Plus ESC
	Overhead scales to provide any user specified async ESC baud
	rate whatever the satellite data rate. ESC limit is
	approximately 70% of the main channel rate, overhead varies
	from <0.5% to >70%.
IBS Option	High rate async data using from 1/32nd to 22/32nd of the IBS
	overhead, providing async baud rates from 0.2% to 5.1% of the
	terrestrial rate (e.g., up to >2400 baud at 64kbps). Includes
	modes compatible with the P300 and P400 Series, P230 &
	P1300/P1361 (using 20/32nd of the overhead).
IBS Aux Data Channel	With IBS option and Advanced Aux option: Intelsat low rate
	async ESC definition carried in bit 1 of TS32 providing a
	synchronous channel at 1/480th of the data rate, allowing up
	to one quarter of this rate for over-sampled async data.
	Compliant with Intelsat IESS-403 low rate ESC definition.

Ethernet Traffic

Parameter	Evolution Series Modem
Standard (unaccelerated)	Throughput depends on traffic format – formats such as UDP
	that do not require acknowledgements run at up to the maximum
	data rate of the modem – unaccelerated TCP (which requires
	acknowledgments) will typically run at up to 128kbps per
	connection, 80 Connections/Sec
PEP (TCP/IP acceleration) Option	Performance Enhancing Protocol (acceleration) for TCP/IP
	traffic – overcomes performance problems associated with TCP
	over satellite . Maximum throughput 8,448kbps
Traffic mode	Bridging (standard) for point-to-point operation Brouting
	(Option) for point-to-multipoint and satellite outbound plus
	non-satellite return. Mesh network support. User selectable
	bridge between Ethernet traffic and Ethernet M&C port.
DHCP	Dynamic Host Control Protocol allows modem IP address to be
	allocated dynamically from an external DHCP network server.
Header Compression	Compression of UDP and IP packet headers at data rates of up
	to 2Mbps. IEEE 802.1p Quality of Service supporting the
	choice of strict priority queuing or fair weighting queuing.
	IEEE 802.1q VLAN support
IP Traffic card & options	Supports TCP acceleration with maximum throughput rates of
	16,896kbps or 25Mbps (Option), subject to compatible options
	in the host modem. Supports up to 1000 concurrent TCP
	connections. Overcomes the inherent limitations of standard
	TCP/IP over satellite. Improves the bandwidth utilization to
	approximately 90% of the selected data rate, with acceleration
	on. Reduces the inefficiencies of the standard TCP slow start
	algorithm. Prevents unnecessary activation of TCP congestion
	control algorithm. Supports compression of UDP and IP packet
	headers at throughput rates up to 16,896kbps, subject to
	compatible options in the host modem. Dual RJ45 ports support
	10/100/1000 BaseT Ethernet. Improves security by separating
	IP Traffic from Ethernet remote M&C on the chassis. Can be
	operated in stand-alone, 1:1 or 1:N redundancy configuration.