Independent Tx And Rx Function - Comtech EF Data SLM-5650A Installation And Operation Manual

SLM-5650A Satellite Modem
Introduction
IP packet traffic is framed via HDLC encapsulation by the GBEI-5650A logic, and the GBEI-
5650A is both the origination and termination point for HDLC encapsulation. HDLC CRC-16
verification is performed on all received (from WAN) HDLC frames.
1.3.3.3.3 T1/E1, T2/E2, G.703
The optional T1/E1, T2/E2, G.703 interface is designed for full duplex capability and is automatically
configured for simplex transmit or simplex receive operation The interface operates at the digital
hierarchy bit rates of 1.544, 2.048, 6.312, and 8.448 Mps as defined by ITU-T G.703.
1.3.3.3.4 LVDS
The optional Low Voltage Differential (LVDS) interface provides a physical and electrical
interface between an SLM-5650A modulator and demodulator and signal sources operating with
LVDS electrical characteristics.
1.3.3.3.5 TIA/EIA-530
The native 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.
1.3.3.3.6 TIA/EIA-613 (HSSI)
The native 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.
1.3.3.4

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.
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.
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