T-Com 235A+

The 235A+ contains a DS1 receiver providing realtime impairment diagnostics, with dedicated LEDs, on any DS1 signal observed at DSX-1 access jacks (IN/OUT or monitor). The receiver provides level and frequency measurement of the T1 signal; it can also indicate bit and frame slippage if a clock signal is supplied to the reference receiver. At the press of a key, the receiver provides a comprehensive impairment statistics report for a specified time period. The receiver recognizes automatically the (SF/ESF/SLC-96) framing format of the monitored signal. It also identifies automatically the test pattern presented. These features, not only contribute in simplifying the operation of the set, they also make it foolproof.

The 235A+ transmitter can deliver a variety of standard and user-defined test patterns to stress and qualify a T1 transmission system. The transmitter can also be used for sending various loop codes (CSU or NI), simulating alarm conditions, and injecting errors.

The receiver and the transmitter can be used completely independently or in combination. When used independently, the receiver can monitor for example a SF 3/24 pattern while the transmitter delivers an ESF QRS pattern. When used in combination, programmed tests such as the repeater test or the bridge-tap test can be carried-out automatically. The receiver and the transmitter can also combine to act as a "golden" CSU; this is of great value when you need to verify the transmission integrity at the customer's premises.