Mocomtech SLM-5650 - Manual (Page 26)

SLM-5650 Satellite Modem Revision 2
Introduction MN/SLM5650.IOM
1–6
1.5.1 TIA/EIA-530
The TIA/EIA-530 interface supports the physical layer requirements for TIA/EIA-530. It also
supports the TIA/EIA-422 electrical interface specification. This interface operates in duplex
from 64 kbps to 20 Mbps.
1.5.2 TIA/EIA-613 (HSSI)
The TIA/EIA-613 interface supports the physical layer requirements for TIA/EIA-613. It also
supports the TIA/EIA-612 electrical interface specification. This interface operates in duplex
from 64 kbps to 51.84 Mbps.
1.5.3 Gigabit Ethernet
In the SLM-5650, the GBEI-5650 performs a simple bridge function and passes IP packets,
unaltered, in each direction between the LAN (10/100/1000Base-T interface) and WAN (SLM-
5650 modulator/demodulator). IP packet traffic is framed via HDLC encapsulation by the GBE-
5650 logic, and the GBEI-5650 is both the origination and termination point for HDLC
encapsulation. HDLC CRC-16 verification is performed on all received (from WAN) HDLC
frames.
1.6 Independent Tx and Rx Function
The Tx (modulator) and Rx (demodulator) sides of the modem are functionally independent and
separately controllable. The baseband Tx and Rx sides of a communications channel passing
through the modem are independently configurable, including the ability to select different
parameters (to include data rate, modulation, and coding) in support of asymmetrical operation.
Note: Data interfaces and IF interfaces are not independent.
Example: If the TIA/EIA-530 interface is selected DO NOT USE TIA/EIA-530 to transmit and
a HSSI interface to receive. The same principle applies to the IF interfaces if 70/140 is selected
DO NOT USE 70/140 to transmit and the L-Band interface to receive.