Product specifications

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Front Panel Operation MN/CDMQX.IOM
5–31
5.4.5 CONFIG: Frame
Framing requires a modulator/demodulator pair grouped into a modem (refer to
the previous section, Sect. 5.4.4 CONFIG: Group, for details).
Framing Mode: Unframed EDMAC
EDMAC-2 D&I++ (◄ ►,ENT)
Select Unframed, EDMAC, EDMAC-2, or D&I++ using the ◄ ► arrow keys, then press ENTER.
5.4.5.1 CONFIG: Frame Æ Unframed
With this selection, there is no framing – no overhead is added, and the unit will be compatible with
other manufacturer’s equipment when operating in a ‘standard’ configuration.
5.4.5.2 CONFIG: Frame Æ EDMAC, EDMAC-2
Framing mix: AUPC-Only
AUPC+EDMAC (◄ ►,ENT)
From either submenu – EDMAC or EDMAC-2 – select AUPC-Only or AUPC-EDMAC using
the ◄ ► arrow keys, then press
ENTER. Note the following:
EDMAC
EDMAC is backwards compatible with Comtech EF Data’s CDM-500, CDM-550,
CDM-550T, CDM-600, and CDM-600L modems.
EDMAC-2
EDMAC-2 is a reduced overhead version of EDMAC, and is not backwards
compatible with the modems listed above.
This Comtech EF Data proprietary framing permits the bidirectional passing of M&C and AUPC
data between local and distant-end units. Note that, if framing is enabled (either EDMAC or
EDMAC-2), AUPC is automatically enabled, but the specific EDMAC feature (passing M&C
data from a local to a distant-end unit) needs to enabled here.
If AUPC-Only is selected, then none of the EDMAC features are available, even though framing
will still be enabled.
If AUPC+EDMAC is selected, the user is further prompted to select whether the unit is an
EDMAC Master, or an EDMAC Slave:
CONFIG: Frame Æ EDMAC, EDMAC-2 Æ AUPC+EDMAC
EDMAC Mode:
Master Slave (◄ ►,ENT)
Select Master or Slave using the ◄ ► arrow keys, then press ENTER. Note the following:
• An EDMAC MASTER is a unit which is local to the M&C computer, and which
passes messages, via the overhead, to a distant-end modem.
• An EDMAC SLAVE is a unit that is not local to the M&C computer, which is at the
distant-end of a satellite link.