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CDM-625A Advanced Satellite Modem
Introduction
1.3.4
Verification
The CDM-625A includes many test modes and loopbacks for rapid verification of the correct
functioning of the unit. Of particular note is the IF loopback, which permits you to perform a
quick diagnostic test without having to disturb external cabling. During the loopback, all of the
receive configuration parameters are temporarily changed to match those of the transmit side,
and an internal RF switch connects the modulator output to the demodulator input. When
normal operation is again selected, all of the previous values are restored.
1.3.5
Updating Modem Firmware
Chapter 4. UPDATING FIRMWARE
The CDM-625A stores its firmware internally in flash memory, which simplifies the firmware
updating process without having to open the modem. Firmware downloads are available via the
Internet from Comtech EF Data's Web site, via e-mail, or on CD, and can be transferred from an
external client PC once connectivity has been established with the modem.
1.3.6
Standard Data Interfaces
Chapter 3. REAR PANEL CONNECTORS
The CDM-625A includes a universal data interface that eliminates the need to exchange
interface cards for different applications. The interfaces offered, as standard, include:
•
RS-422 (EIA530) DCE (at rates up to 14 Mbps)
•
X.21 DTE and DCE (at rates up to 2.048 Mbps)
•
V.35 DCE (at rates up to 14 Mbps)
•
G.703 E1, balanced and unbalanced
•
G.703 T1, balanced
•
G.703 E2, unbalanced
•
G.703 T2, balanced and unbalanced
•
Quad E1 Drop and Insert (QDI) – up to 4 balanced E1ports
•
Serial LVDS (at rates up to 25 Mbps)
PINOUTS
AND
1–5
Revision 0
MN-CDM625A
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