Telecommunications Tech. Model 4144A T1/FT1 Data Interface Operating Manual.

Telecommunications Techniques Model 41800 Data Interface Operating Manual.

Telecommunications Tech. Fireberd ML 11732 1993 T1/FT1 Data Interface Op. Manual

Telecommunications Techniques Corp 40365 T1 Interface Adaptor Operating Manual

Telecommunications Techniques Model 40405 DS1/T1 (D4 Framing) Interface Manual.

HP 4275A Operating Manual: Comb Bound & Protective Covers

Telecommunications Techniques Model 42522 Data Interface Reference Manual.

Telecommunications Techniques Corp 40405 DS1/T1 (D4 Framing) Interface Manual