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Use the ▲▼ arrow keys to scroll through the available options. Press ENTER.
Available Framing Types are:
FRAMING TYPE
► None
► D&Is (Drop & Insert) (FAST option)
which includes:
D&I (FAST option)
•
D&I++ (FAST option)
•
QDI (Quad Drop & Insert)
•
(FAST option)
Framed QDI (FAST option)
•
D&I Enhanced
•
► EDMACs which include:
EDMAC
•
EDMAC-2
•
(as in the CDM-570)
EDMAC-3
•
Front Panel Operation
COMMENTS
---
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.
D&I++ is a Comtech EF Data proprietary framing – it is a closed-
network frame structure similar to D&I, but which permits AUPC and
EDMAC. See Appendix E. CLOCK MODES and DROP & INSERT
(D&I) for further information.
QDI is a variant of D&I that allows use of up to four E1 terrestrial
ports.
Framed QDI is a concatenation of QDI and EDMAC framing.
Available in E1-CCS; this allows enabling of ESC, and then AUPC.
EDMAC is a Comtech EF Data proprietary framing. The framing
permits bi-directional passing of M&C and AUPC (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 Turbo BPSK modes and at rates above
2.048 Mbps). See Appendix H. EDMAC CHANNEL for further
information.
EDMAC-3 uses the same overhead as EDMAC framing, but the
EDMAC channel operates 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 applications. See Appendix H.
EDMAC CHANNEL for further information.
6–11
CDM-425 Advanced Satellite Modem
MN-CDM-425
Revision 0
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