Additional Features:
- Transmission: T1/AMI and B8ZS
- Channel bank: D1D, D2, D3/D4, ESF and SLC-96
- DS1 Reference Section
- Input level: 600 mV pk-pk across 100 W nominal
- Diagnostics: LOS (loss of signal)
- DS1 Receive Diagnostics Section
- Input level: +6 to -34 dBDSX in TERM or BRDG; -17 to -23 dBDSX in MON
- Input impedance: TERM or MON: 100 ± 5% W, BRDG: >1000 Ohms
- Diagnostics LEDs: LOS, >15 0's, < 12.5% 1's density, BPV, Frame Bit Error, Frame Loss, Bit Error, CRC Error, AIS, Yellow Alarm, Sync, B8ZS
- Framing format: Auto-frame to SF, ESF, SLC-96
- Pattern sync: on pattern sent by transmitter or auto-search
- Auxiliary T1 output: Nominal 6.0 Vpk-pk across 100 W
DS1 Transmit Section
- Output level: T1 port: 0 (*), -7.5, -15 dBDSX T1-20 dB port: 20 dB below level at T1 port
- Patterns: External, framed and unframed 215-1, 220-1, QRS, 223-1, 3/24 all 1's, 1/8 and 24-bit userdefined code
- Clock selection: Master, recovered and externally supplied
- Error injection: BPV, BIT, CRC, FR BIT
- Error rate: 10-9 to 9 x 10-3
- Loop codes: CSU, NI and user-defined
- Auxiliary T1 input: Nominal 6.0 V pk-pk/100 W input impedance
Control and Measurements Section
T1/DS1 Statistics
- Error counts: BPV, frame bit, CRC
- Time based statistics: ES, SES, CSES
- Bit error rates: Logic Bit Error Rate (BER), Frame Bit Error Rate (FBER), CRC Bit Error Rate (CBER)
- Timing slips: Bit-by-bit slippage display & frame slip count
- Level: (DSX): +6 to -6 dB ± 1 dB (TERM/BRDG): +6 to -34 dB, ± 3 dB
- Bit rate accuracy: ± 10 Hz
- Span line current: 0 -160 mA, ± 1%
- Test time: Settable by 1 min steps to 100 hours
RS-232-C Interface Port
- Access: 9 pin D-sub female
- Baud rate: 300-9600
Miscellaneous
- AC powering: 108 to 126 VAC, 7W
- Battery power: Up to 4 hours (option 01)
- Operating temp: -20 to +40 ºC
- Humidity: Up to 90% non-condensing
- Dimensions: 7" x 11" x 9" (H x W x D), the battery module adds 1" to the depth
The T-COM 235A+ was designed to provide, in a moderately priced and easy-to-use instrument, all the capabilities you need to reliably qualify and maintain a variety of DS1 transmission systems and equipment, in the CO, the outside plant, or in customer's premises.
The 235A+ contains a DS1 receiver providing real time 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.
A hard copy of the test results can be obtained by connecting a printer to the RS-232-C port. The 235A+ basic capabilities can be extended by adding several hardware and/or software based options.
| Manufacturer | T-COM |
|---|---|
| Condition | Used |