产品名称：
型号：TL553A-R3
品牌：BLACK BOX
描述：
With an RS-232 Data Sharer from Black Box, you can cut modem costs and leased-line charges by linking up to four RS-232 devices to one modem and phone line.
Use a single phone line and modem to share multiple RS-232 devices.
Transparent to data rates up to 64 kbps.
Run sync or async half- or full-duplex.
Works with popular IBM communications protocols.
Also available in 2- and 8-port versions.
规格：
Reduce line costs in your RS-232 system by using a BLACK BOX RS-232 Data Sharer to connect four devices to a single modem and phone line.
The RS-232 Data Sharer features transparent operation up to 64 kbps and convenient LED monitoring. Front-panel switches enable and disable RTS on each input port.
The Data Sharer features antistreaming circuitry to lock out any port the instant it begins to stream. On this 4-port model, hardware-prioritized scanning lets the most frequently used channels go first.
The RS-232 Data Sharer is compatible with various popular IBM communications protocols, such as half-duplex Bisynchronous Communication and Synchronous Data Link Control (SDLC).
This product works with:
Adapter Cable for IBMContoller (EHM002)
Standard RS-232 Low-Noise Cable (ECM25T, ECM25C)
CSU/DSU MS (MT132V-R2)
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