Comtech EF Data CDM-625 - Manual (Page 111)

CDM-625 Advanced Satellite Modem Revision 15
Front Panel Operation MN-CDM625
5–11
Use the ▲▼ arrow keys to scroll through the available options, and then press ENTER. The
available Framing Types are as follows:
Framing Type Comments
► None ---
► IBS (FAST option) ---
► IDR (FAST option) ---
► D&Is (Drop & Insert)
(FAST option) which includes:
o D&I
(FAST option)
The D&I (Drop and Insert) 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.
o D&I++
(FAST option)
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
Chapter 9 . C LOCK M ODES a nd D ROP & I NSERT ( D&I) for f urther
information.
o QDI (Quad Drop & Insert)
(FAST option)
QDI is another variation of D&I that allows up to four E1 terrestrial ports to
be used.
o Framed QDI
(FAST option)
Framed QDI is a concatenation of QDI and EDMAC framing.
o D&I Enhanced Available – when in E1-CCS; may enable ESC, and then AUPC.
► EDMACs which include:
o EDMAC 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.
o EDMAC-2
(as in the CDM-570)
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 Turbo BPSK modes and at rates above 2.048 Mbps). For further
information, see Chapter 11. EDMAC CHANNEL.
o EDMAC-3 EDMAC-3 uses the same overhead as EDMAC framing, but the EDMAC
channel operated at 1/3 the rate of original EDMAC. Most of the overhead
is dedicated to carrying the remote modem’s complete status information
(including AUPC) to the near-end modem very quickly. Tailored to SNMP
proxy appl ications. F or f urther i nformation, s ee Chapter 11. E DMAC
CHANNEL.
► ESC++ 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 Chapter 12. ESC++.