Comtech EF Data CDM-IP 300L - Manual (Page 51)

CDM-IP 300L IP-Centric Satellite Modem Rev. 1
CD/CDMIP300L.IOM
23
1.5 S
PECIFICATIONS
Table 1. General Specifications
Parameter Description
Operating Frequency Range 950-1750MHz, in100 Hz steps
Data Interface 10/100 BaseT Ethernet RJ45-8
Digital Data Rate 2.4 kbps to 5.000 Mbps, in 1 bit steps
Note: In some applications the practical lower data rate is
typically higher than19.2 kbps, depending upon the performance of
equipment used in conjunction with the CDM-IP 300L. These
applications include the use of a BUC or a LNB.
Symbol Rate 4.8 ksps to 2.5 Msps
Modulation/Demodulation BPSK
QPSK /OQPSK
8-PSK
Forward Error Correction (FEC) Viterbi, K=7, 1/2, 3/4, 7/8 rates
Sequential 1/2, 3/4, 7/8 rates
Reed-Solomon Concatenated per Intelsat
Reed-Solomon Concatenated per closed network
Trellis 2/3 rate (8-PSK)
Turbo 1/2, 3/4, 21/44, and 5/16 rates
Uncoded
Reed Solomon Interleaver Depth 8, closed network; Depth 4 or 8 per IESS-308, 309, and 310
Data Scrambling IESS-308 (V.35 Intelsat), IESS-309/310, FDC, V.35 (EFD/CSC),
Modified V.35, None
Differential Encoding/Decoding ON/OFF
External Reference Input 1, 5, 10, 20 MHz (75 Ω 0 to 20 dBm on 50Ω BNC Female)
Note: Only 10 MHz allowed when operating with BUC and LNB
requiring 10 MHz reference from modem.
Test Modes
IF
Loopback
RF Loopback
Available only when TX and RX are both L-band:
Disconnects the IF input from the RX input connector and couples
it to a sample of the TX IF output. The IF output is not affected.
Sets the demodulator frequency to the same value as the
modulator. For the modem to lock, an external IF loop must be
provided.
Note: Do not enable IF Loopback (or link the TX to RX by cable or
satellite link) on a CDM-IP 300L modem operating in
EasyConnect Mode when connected to a LAN. In this
configuration, EasyConnect will resend all layer 2
broadcast packets and cause a “broadcast storm” on the
LAN. To perform a loop test to verify the modem or
satellite link, set the CDM-IP modem to Router Mode.