• Internal: SONET, 51.84 MHz ± 10 ppm; DS3, 44.736 MHz ± 10 ppm; DS1, 1.544 MHz ± 100 ppm
• External: SONET, 51.84 MHz ± 100 ppm; 155.52 MHz ± 10 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 and 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-c Payload: An internally generated 2²³-1 PRBS sequence with valid path overhead

• 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

Pointer Control: Single positive and negative pointer justification and NDF pointer changes to any value for both SPE and VT

• STS-1: Detection based on A1, A2
• STS-3/12 (Option): Detection based on A1, A2, A2

• OC-1/3 Tx Power Out: -10 dBm
• OC-12 Tx Standard Power Out: -8 dBm
• OC-12 Tx High Power Out: -4 dBm
• OC-1/3/12 Rx Sensitivity: -30 dBm

• Section: B1 Code Errors, OOF (Out of Frame), LOF, Frame pattern errors, LOS
• Line: B2 Code Errors, LOP, FEBE, AIS
• Path: B# Code Errors, AIS, Yellow, FEBE

Payload Parameters

• VT Path: BIP-2, AIS, Path Yellow, FEBE
• DS3 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

• 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/3C (Bit Error): Rate, Total, ES

• Section: D1-D3, 192 kb/s
• Line: D4-D12, 576 Kb/s

• Local and Express handset interface

• RS-232C, GPIB, parallel printer ports, VT100 Terminal drivers

• Dimensions: 6" H x 14.4" W x 16.5" D (152mm x 366mm x 419mm)
• Weight: 22 lbs

• ST-112-E3: All electrical
• ST-112-03: Up to OC-3
• ST-112-12: Up to OC-12 (std or high power)
• Type 560 connectors for STS-1/DS3
• Bantam Connectors for DS1
• Orderwire handset
• FC/PC, ST or SC optical connectors
• Rack Mount