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Secondary channel operation is supported at all speeds except 64 kbps, with terminal rates of 75, 150, 300, 600, 1200, and 2400 bps. The asynchronous primary channel is supported at all rates up to and including 19.2 kbps with secondary and nonsecondary channel operation. Technically Speaking • Front-panel controls are used for configuration and testing. The CSU/DSU can generate and monitor either of two industry-standard test patterns during selected tests, and report the number of errors on a front-panel display. It will also respond to standard DSU and CSU loopback commands from the telephone company central office or DDS/V.54 commands from a remote CSU/DSU MS. • Seven LEDs show the status of the primary and secondary DTE interface leads. • Three data DTE connectors on the rear panel provide a primary-channel V.35 or RS-232, and a secondary-channel RS-232 port. In Switched-56 operation, the secondary channel is used for control. An 8-pin telco jack, the power cord, and a fuse are also located on the rear panel. • Each unit includes an 8-foot (2.4-m) power cord. The power cord is terminated by a 3-prong plug that connects to a grounded power receptacle. NOTE: Use only a grounded, 115-VAC, 60-Hz receptacle. 3 of 3 TECH SPECS Diagnostics — DTE, DTE/loop, DTE with test pattern, loop only, test pattern DTE Rates — 2.4, 4.8, 9.6, 19.2 kbps sync or async; 38.4, 56, or 64 kbps sync User Controls — (16) front-panel buttons: Enter, Up-Arrow, Down- Arrow, Cancel, 0–9, #, * Interface — V.35 or RS-232 sync or async Connectors — (2) DB25 female, (1) M/34 female, (1) RJ-48C Indicators — (7) LEDs: RS, CS, TD, RD, CD, ALRM, TST Power — 115 VAC, 60 Hz, 8 watts Size — 2.3"H x 8.8"W x 10.3"D (5.8 x 22.4 x 26.2 cm) Weight — 3 lb. (1.4 kg) 1/30/2007 #11457 724-746-5500 blackbox.com . The CSU/DSU MS . RJ-45 line cable . User’s manual WHAT‘S INCLUDED Item Code CSU/DSU MS MT132V-R2 • Digital Data Service (DDS) is a wide-bandwidth, private leased line that transmits data in digital, rather than analog, format. DDS lines are 4-wire circuits (Transmit pair, Receive pair) linked by special repeaters and separated from conventional analog lines. They can provide a higher data-transmission rate and maintain a higher level of data integrity than analog trans- mission service. • DDS is a nationwide service of AT&T® that allows inter- connection and transport of data for the regional Bell operating companies. The telephone companies provide a DDS-compatible service within their region and provide the local loop service to DDS customers. • An ISU (Integrated Service Unit) replaces the modem in a network. A combination of the CSU (Channel Service Unit) and the DSU (Data Service Unit), it is usually called a CSU/DSU. • The CSU/DSU MS provides the standard DDS rates of 2.4, 4.8, 9.6, 19.2 kbps sync or async, and 56 kbps sync. It also provides DDS rates of 38.4 and 64 kbps. • The CSU/DSU MS supports DTE rate adaption to 2.4, 4.8, 9.6, 19.2, and 56 kbps at 56-kbps loop speed. Secondary channel operation is supported at all speeds except 64 kbps, with terminal rates of 75, 150, 300, 600, 1200, and 2400 bps. The asynchronous primary channel is supported at all rates up to and including 19.2 kbps with secondary and nonsecondary channel operation. Technically Speaking • Front-panel controls are used for configuration and testing. The CSU/DSU can generate and monitor either of two industry-standard test patterns during selected tests, and report the number of errors on a front-panel display. It will also respond to standard DSU and CSU loopback commands from the telephone company central office or DDS/V.54 commands from a remote CSU/DSU MS. • Seven LEDs show the status of the primary and secondary DTE interface leads. • Three data DTE connectors on the rear panel provide a primary-channel V.35 or RS-232, and a secondary-channel RS-232 port. In Switched-56 operation, the secondary channel is used for control. An 8-pin telco jack, the power cord, and a fuse are also located on the rear panel. • Each unit includes an 8-foot (2.4-m) power cord. The power cord is terminated by a 3-prong plug that connects to a grounded power receptacle. NOTE: Use only a grounded, 115-VAC, 60-Hz recep...

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