General DataComm SpectraComm SDT, Инструкция по установке и эксплуатации

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Introduction & Specifications Product Overview
076R174-000 SpectraComm SDT 1-3
Issue 4 Installation and Operation Manual
SC-SDT Interfaces/Connectivity
The typical installation environment for the SC-SDT device is a SpectraComm 5000/UAS shelf,
SpectraComm 2000 shelf, or any model of the SpectraComm standalone enclosures. In these shelf/
enclosure systems, the SC-SDT provides multiple physical interfaces, described below. The SC-
SDT is shipped from the factory with all ports set to
Disabled
.
Note
Refer to Figure 2-1 for detailed views and information on rear panel connections to the SC-SDT in the various
GDC shelves and enclosures.
Craft Port/Contact Sense
The rear panel DB25 RS-232 craft interface supports contact sense connections. It also supports
local configuration and monitoring via fixed serial async 9600 baud, 8 data, 1 start/stop, no parity.
Ethernet 10/100BASE-TX LAN Ports (Logical E0)
A rear panel RJ45 connector provides the Ethernet (LAN) interface for connecting the SC-SDT to
any standard 10/100B-T LAN device, including PCs, servers, hubs and switches.
Transport Ports
Three high density 26-pin “smart” serial connectors provide the front panel DTE or DCE interface
for packetized, HDLC-based synchronized data transport. Six serial interfaces are supported: EIA/
TIA-232, EIA/TIA-449, X.21 and V.35 in both DTE and DCE modes; and EIA530 or EIA530A in
DTE mode only.
Diagnostics and Statistics
• Generates/answers pings
• Tests Contact States
• Transmit and Receive packet counts on Ethernet interface
• Transmit and Receive byte counts on Ethernet interface
• Transmit and Receive packet and byte counts on Sync ports
Throughput Performance
Typical Throughput Conditions
It is expected that the traffic patterns of typical applications will be bursty in nature, thereby
allowing all three sync ports to deliver data without loss under typical traffic conditions
Application (Protocol) Flow Control
It is expected that the customer's end-devices provide a flow control mechanism at the application
level. Some example applications (or protocols) that provide this capability are FTP and X.25.
These end applications will hold-off data transmission to avoid traffic loss while maximizing
throughput across the network.
Worst-case Throughput Conditions
During extreme traffic conditions, the SC-SDT will handle an aggregate rate of 3 Mbps, full duplex.
This translates to 1Mbps per port if using all three ports under worst-case conditions.
Note
Extreme traffic conditions are defined as continuous sync data (i.e. non-bursty) with application flow-control
required.