T-336 Series

Advanced V.34 Modem/Super Shelf

The T-336 is a series of high performance, synchronous and asynchronous, full-duplex, multi-standard standalone or rack-mounted modem. It is designed for use on 2-wire dial-up and 2/ 4- wire leased-line circuits. In V.34 mode the T-336 provides full-duplex operation at up to 33.6Kbps on a 2/4-wire PSTN line with features like line probing, symbol rate and carrier frequency automatic selection. 

The TRS-16 Supershelf can accommodate up to 16 modem cards with 16 ports, control unit and single or dual redundant power unit. Dual redundant power supply meaning if one power does fail, the other one is capable of powering the entire rack.

.Fully compatible with ITU-T V.34+/V.34/V.32bis/V.32/V.22bis/V.22/V.23/V.21/V.24/V.28/V.25bis/V.54/V.52/V. 42/V.42bis/V.14/V.13/V.8 and Bell 212A/103 
.19” rack accommodates up to 16 modem cards with hot-swap and profile copy functions 
Achieve throughput up to 115200bps 
V.13 simulated carrier in half duplex 
MNP4, V.42 error correction 
MNP5, V.42bis data compression 
Extended AT and ITU-T V.25bis command set
Leased line dial back-up and restore in manual or auto mode 
Auto fallback and fall forward 
Remote configuration via secondary channel 
Front panel lock and password protect 
Password & call back security 
Diagnostic capabilities: 
Analog loopback, digital loopback and remote, digital loopback (with pattern or not); BERT test pattern using 511 
Auto or manual dialing/answer 
Front panel configuration via rubber switches and LCD 
Front panel key reset function 
G3 FAX send/receive compatible with EIA-578 Class 1 FAX command (optional)


V.34+: 33.6/31.2 Kbps SM (4D TCM)
V.34: 28.8/26.4/24/21.6/19.2/16.8/14.4/12/9.6/7.2/4.8/2.4 Kbps SM(4D TCM)
V.32bis: 14400/12000/7200 bps TCM
V.32: 9600 bps TCM, 9600/4800 bps QAM 
V.26bis: 2400/1200 bps DPSK
V.22bis: 2400 bps QAM, 1200 bps BPSK 
V.22/Bell 212A: 1200 bps DPSK
V.23: 1200/75, 600/75 bps FSK
V.21/Bell 103: 300 bps FSK

Data Format

Synchronous or Asynchronous
Total bit length: 8, 9, 10, 11

Data Speed

24000/26400/28800/31200/33600/38400/57600/76800/115200 bps
24000/26400/28800/31200/33600 bps 

  Total bit length : 8, 9, 10, 11 bits 
  Parity bit : odd, even, none
  Stop bit : 1, 1.5, 2 bits

Line Interface

Cx/Nx: RJ-11 for dial-up, JM8 (like RJ45) for leased line
NDx: 6-pin Terminal Block or 50-pin Centronic

DTE Interface

EIA RS-232C, ITU-T V.24/V.28

Line Requirement

Dial-up line, 2/4-wire leased line

Transmit Level

Dial-up line: 0 to -15 dBm; Leased line: 0 to -31 dBm

Receive Dynamic Range

-4 to -43 / 0 to -33 dBm


Automatic adaptive EQ

Call Progress Monitoring

Dial tone, Ring, Ring-back, Busy and backup dial

Dialing Command and Type

Extended AT and V.25bis using Tone/Pulse/Mixed

Clock Source


Flow Control



Test Features

V.54/V.52 , LAL/DL/RDL
Test Patterns - 511

Line Status Monitoring

Tx level, Rx level, S/N ratio, EQM value, delay, phase jitter, freq. offset, far-end freq. offset, far-end echo, DTE format, retrain count, Tx baud rate, Rx baud rate, Tx carrier, Rx carrier, Tx speed, Rx speed, Tx power back-off level, Interface lead monitoring

Power Requirement


AC: 90 ~ 265 V, Auto-range, 47 ~ 63 Hz
DC: -36 ~ -72 V (optional)
Dual redundant power unit for rack (optional)

Power Consumption

< 5W

Environment Temperature

Operating Temperature : 0 °C ~ 50 °C
Storage Temperature : -25 °C ~ 70 °C


Up to 95% non-condensing