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CDM-625A Advanced Satellite Modem
Front Panel Operation
Use the
arrow keys to scroll through the available options, and then press ENTER. The
▲▼
available Framing Types are as follows:
Framing Type
► None
► IBS (FAST option)
► IDR (FAST option)
► D&Is (Drop & Insert)
(FAST option) which includes:
D&I
o
(FAST option)
D&I++
o
(FAST option)
QDI (Quad Drop & Insert)
o
(FAST option)
Framed QDI
o
(FAST option)
D&I Enhanced
o
► EDMACs which include:
EDMAC
o
EDMAC-2
o
(as in the CDM-570)
EDMAC-3
o
► ESC++
Comments
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The D&I (Drop and I nsert) multiplexer works in conjunction with the G.703
interfaces to enable the modem to transmit or receive fractional parts of a
T1 or E1 data stream.
D&I++ is anot her C omtech pr oprietary f raming – it is a c losed-network
frame structure, similar to D&I, but which permits AUPC and EDMAC. See
Appendix E . C LOCK M ODES and D ROP & I NSERT ( D&I) for fu rther
information.
QDI is another variation of D&I that allows up to four E1 terrestrial ports to
be used.
Framed QDI is a concatenation of QDI and EDMAC framing.
Available – when in E1-CCS; may enable ESC, and then AUPC.
EDMAC is C omtech E F Data's pr oprietary f raming. I t is ba ckwards
compatible with the CDM-500, CDM-550, CDM-550T, CDM-600 and CDM-
600L. T he f raming per mits bi -directional pas sing of M &C and A UPC
(Automatic Uplink Power Control) data between local and distant-end units.
EDMAC-2 is a reduced overhead version of EDMAC, and is not completely
backwards compatible with the modems listed above, but is in some modes
(e.g., in T urbo BPSK modes and at rates above 2.048 Mbps). F or further
information, see Appendix H. EDMAC CHANNEL.
EDMAC-3 uses t he s ame ov erhead as E DMAC f raming, but t he E DMAC
channel operated at 1/3 the rate of original EDMAC. Most of the overhead
is dedi cated t o c arrying t he r emote m odem's c omplete s tatus i nformation
(including AUPC) to the near-end modem very quickly. T ailored to SNMP
proxy appl ications. F or f urther information, s ee Appendix H . E DMAC
CHANNEL.
ESC++ is anot her C omtech pr oprietary f raming – it is a c losed-network
frame s tructure, w hich per mits A UPC, E DMAC and ESC. F or f urther
information, see Appendix J. ESC++.
6–12
Revision 0
MN-CDM625A
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