Tektronix ST112 Telecommunication Transmission Test Set with options 04 and 08 installed. The laser output on this unit does not function. Unit is being sold AS-IS.



Synchronization Interfaces

Internal -
SONET: 51.84 MHz±10 ppm.
DS3: 44.736 MHz±10 ppm.
DS1: 1.544 MHz±50 ppm.

External -
SONET: 51.84 MHz±20 ppm; 155.52 MHz±100 ppm.

Loop Timing - Recovered Rx Clock to Transmitter.

BITS Timing - DSX-1 Input used as Tx Timing Reference.


DS3 Payload -
General: A single internally or externally generated asynchronous DS3 signal is mapped into an STS-1 payload.
Frame Patterns: M13, C-Bit, unframed.
Payload Patterns: 223 - 1, 215 - 1, AIS, Idle, All Ones.

Tributary VT1.5 Payload -
General: A single internally or externally generated asynchronous DS1 signal is mapped into a specified STS-1 payload virtual tributary.
Active channel pattern: PRBS 223 - 1, QRW, 3/24, 55 Octet, All Ones.
Framing: Unframed, SF, ESF, SLC96.
Modes: Floating, Bit Asynchronous, Simplified H4 Coding, Bit Synchronous Locked, Byte Floating, Byte Locked.
VT Pointer Justification: Positive and negative single justifications.
New Data Flag (NDF) operations cause the pointer to jump to a new location.
Payload structure: DS1 payload is mapped into one channel or all 28 channels.

STS-3c/12c Payloads - An internally generated 223 - 1 PRBS sequence with valid path overhead.

Alarm and Error Generation

Section - Loss of Signal (LOS), Loss of Frame (LOF), BER, Single error inject.

Line - Alarm Indication Signal (AIS), Far End Receive Failure (FERF), Bit Error Rate (BER), Single error inject.

Path - Loss of Pointer (LOP), STS Path Yellow, STS Path AIS, BER, Single error inject, Far End Block Error (FEBE).

VT - VT LOP, VT Path Yellow, VT Path AIS, BER.

Alarm Type - Burst or continuous, external TTL event trigger when alarm is activated.

Random Bit Error Injection - 1.5 x 10-3 to 10-9 Rate or single.

Bipolar Pulse Violation - 1.5 x 10-3 to 10-9 Rate or single.


Transport and Path Overhead Byte Modification - All of the overhead bytes except B1-B3 and H1-H3.

Pointer Control - Single positive and negative pointer justifications and NDF pointer changes to any valid value for both SPE and VT.


Frame Detection -
STS-1: Detection based on A1, A2.
STS-3/12: Detection based on A1, A2, A2.

Indicator Lamps - LEDs provide current and history status for Section, Line, Path, SPE, VT, DS1 and DS3 status.

NOTE: CLASS 1 LASER PRODUCT. This product conforms to the applicable requirements of 21 CFR 1040 at the date of manufacture.


SONET Alarms -
Section: B1 Code Errors OOF (Out-of-frame), LOF, Frame pattern errors, LOS.
Line: B2 Code Errors, LOP, FEBE, AIS.
Path: B3 Code Errors, AIS, Yellow, FEBE, RDI.

Payload Parameters -
VTI.5 Payload to DS1 payload: Parity and frame errors, bit errors, AIS, Idle and All Ones, X-Bit.
VT1.5 payload: Bit Errors (PRBS or fixed word), AIS, Yellow, CRC-6, Frame errors, LOF.
STS-3c payload: Bit Errors.

T-carrier Parameters -
DS3: BPV, Parity, Bit and Status parameters.
DS1: BPV, CRC, Bit and Status parameters.

Performance Statistics

Parameters -
Section (B1): Total, Rate, ES, SES Total.
Line (B2): Total, Rate, ES, SES Total.
STS Path (B3): Total Rate, ES, SES.
VT Path (BIP-2): Total, Rate, ES, SES Total.
Payload/DS3 (Bit and Parity): Rate, Total, ES, SES.
Payload/DS1 (Bit Error): Rate, Total, ES.
Payload/3c (Bit Error): Rate, Total, ES.

Data Communications Channel

Section - D1-D3, 192 Kb/s.

Line - D4-D12, 576 Kb/s.


Local and Express handset interface.

Remote Interfaces

Ports - RS-232-C, GPIB, parallel printer.

Drivers - VT100 terminal.

Optical Specifications

OC-1/3 Tx Power Out - -9 dBm Typical.

OC-12 Tx Standard Power Out - -8 dBm.

OC-12 TX High Power Out - -4 dBm.

OC-1/3/12 Rx Sensitivity - -30 dBm.


AC Line - 115/220 V AC±10%.

Power Consumption - -250 W maximum.

Safety - UL1244, CSA231.

Physical Characteristics

Dimensions mm in.
Height 152 6
Width 366 14.4
Depth 419 16.5
Weight kg lbs.
Net 10 22
Warranty Sold As-Is

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Tektronix Sonet Test Set, Opt. 04/08

  • Item ID: 250902
  • Brand: Tektronix
  • Model: ST112
  • Availability: In Stock
  • Condition: Parts/Repair
  • $35.00

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Tags: Tektronix, ST112, Datacom, Telecom, Sonet, Test, Set, Opt., 04/08