CDM-625A
Advanced Satellite Modem_高阶卫星数据机
这是Comtech的第一款高阶卫星数据机，它将诸如VersaFECFE和低密度奇偶校验（LDPC）码之类的高级前向纠错（FEC）与革命性的DoubleTalk Carrier-in-Carrier频宽堆叠，从而在所有情况下均实现了最大程度的节省。 先进技术的这种结合实现了多维优化，从而使卫星通信用户能够：
•最大限度地减少运营费用（OPEX）
•在不使用额外转发器资源的情况下最大化吞吐量
•在不使用额外转发器资源的情况下最大化可用性（边际）
•通过允许使用较小的BUC / HPA和/或天线来最小化资本支出（CAPEX）
•支援发射与接收可以不同介面: 例如发射IF 接收L-band
- DoubleTalk Carrier-in-Carrier bandwidth compression
- Carrier-in-Carrier Automatic Power Control
- Adaptive Coding and Modulation (ACM)
- Packet Processor with header compression, payload compression, advanced Quality of Service (QoS) and Managed Switch Mode
- 4-port managed Ethernet switch with VLAN and QoS
- Jumbo frame support
- Dual Band Capability: 70/140 MHz and L-Band in same unit, extended L-Band receive
- Data Rate: 18 kbps to 25 Mbps
- Symbol Rate: 18 ksps to 12.5 Msps • Modulation: BPSK, QPSK/OQPSK, 8PSK/8-QAM, 16-QAM
- FEC: Viterbi, Sequential, Concatenated Reed Solomon, TCM, Turbo Product Code (TPC) (IESS-315 Compliant), LDPC Code and VersaFEC (low-latency LDPC)
- Widest Range of data interfaces: EIA-422/530, V.35, G.703 T1, G.703 E1, G.703 T2, G.703 E2, Quad G.703 E1, ASI, LVDS, HSSI, 4-port 10/100Base-T Ethernet
- IEEE 1588v2 Precision Time Protocol
- Sub Mux to multiplex IP/Ethernet traffic with serial or G.703 traffic
- Drop & insert for T1/E1
- Enhanced D&I++ for single T1/E1 & quad E1
- Management: 10/100Base-T Ethernet with SNMP, Distant End SNMP Proxy, HTTP, Telnet and EIA-232/EIA-485
- Carrier ID using MetaCarrier® Technology
- Embedded Distant-end Monitor and Control (EDMAC)
- Automatic Uplink Power Control (AUPC)
- Engineering Service Channel (ESC/ESC++)
- Standard high-stability internal reference (± 6 x 10-8)
- 5-tap Adaptive Equalizer
- L-Band TX: 10 MHz reference for BUC, FSK communications and optional BUC power supply
- L-Band: Advanced FSK for LPOD M&C
- L-Band RX: 10 MHz reference and LNB power supply
- Open network modes
- 1:1 and 1:10 redundancy switches availabl
最近使用的案例:
左边CDM625A在Center中心，需要对各站有紧急需求的话，建立卫星Link备路，透过该站需要的专线
CDM625A支援 Full L2/L3 protocal，所以有支援L2的Trunk与Access应用
假设中心只有一台CDM625A需要对应到三个离岛
中心可以放一台L2 并规划与设定好Vlan与Trunk
目前举例三站，假设有20站也可以
Site1: Vlan 10
Site2: Vlan 20
Site3: Vlan 30
Management: Vlan 100
SiteA CDM625A只要设定Valn 10与控制 Vlan100
SiteB CDM625A只要设定Valn 20与控制 Vlan100
SiteC CDM625A只要设定Valn 30与控制 Vlan100
这样CDM625A外站分别上卫星, 主站就不用去更换实体专线,
因为控制Vlan都是一样，所以只要卫星建立后，就可以看到对方设备