Black Box ME445C-35, ME444AE-R3, ME445C-X.21, ME444A-R3 manual Specifications, Flow Control None

256-KBPS LINE DRIVER (V.35, RS-530, OR X.21)

1. Specifications

Compliance: FCC Class A, IC Class/classe A

Protocol: Synchronous or asynchronous

Clock Source: Internal, external (from attached device), or receive clock derived from the receive signal

Flow Control: None

Operation: 4-wire, full- or half-duplex, point-to-point or multipoint

Data Rate: Sync: 19.2, 32, 48, 56, 64, 72, 96, 112, 128, 144, 192, or 256 kbps (user-selectable); Async: 19.2, 28.8, 38.4, 57.6, or 115.2 kbps (user-selectable)

Maximum Distance: See the tables in the Appendix

User Controls: (4) Front-mounted buttons: (1) DIG, (1) ANA, (1) REM, (1) PATT;

(1)Internal data-rate screwdial; (14) Internal jumpers and (1) internal 3-position DIP switch for timing, testing, signal levels/impedances, and other features

Diagnostics: V.54-compliant loopback tests; V.52-compliant BERT

Standards: Loopback tests: ITU-TSS V.54; BERT: ITU-TSS V.52

Leads/Signals Supported: See Tables 4-2 through 4-5

MTBF: 75,500 hours

Interfaces: Line side: Proprietary; Device side: ITU-TSS V.35

Connectors: ME444A-R3, ME444AE-R3: (1) 34-pin M-block female, (1) 5-position terminal block;

ME444A-530-R3, ME444AE-530-R3, ME445C-530, ME445C-35, ME445C-X21: (1) DB25 female, (1) 5-position terminal block

Indicators: (7) Front-mounted LEDs: PWR (power), RTS, TD, RD, DCD, TEST, ERR (error)

Temperature Tolerance: 32 to 122°F (0 to 50°C)

Humidity Tolerance: Up to 90% noncondensing

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