CDM-625A Advanced Satellite Modem
MN-CDM625A
Front Panel Operation
Revision 4
6–11
Available Framing Types are:
FRAMING TYPE
COMMENTS
► None
---
► IBS (FAST option)
---
► IDR (FAST option)
---
► D&Is (Drop & Insert) (FAST option)
which includes:
•
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.
•
D&I++ (FAST option)
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 (Quad Drop & Insert)
(FAST option)
QDI
is a variant of D&I that allows use of up to four E1 terrestrial
ports.
•
Framed QDI (FAST option)
Framed QDI
is a concatenation of QDI and EDMAC framing.
•
D&I Enhanced
Available in E1-CCS; this allows enabling of ESC, and then AUPC.
► EDMACs
which include
:
•
EDMAC
EDMAC
is a Comtech EF Data proprietary framing. It is backwards
compatible with the CDM-500, CDM-550, CDM-550T, CDM-600 and
CDM-600L. The framing permits bi-directional passing of M&C and
AUPC (Automatic Uplink Power Control) data between local and
distant-end units.
•
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). See
Appendix H. EDMAC CHANNEL
for further
information.
•
EDMAC-3
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.
► ESC++
ESC++
is Comtech EF Data proprietary framing – it is a closed-
network frame structure that permits AUPC, EDMAC and ESC. See
Appendix J. ESC++
for further information.
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