Adtran TYPE TSU 120 Multiplexer Modem, PN1202129L2

The Adtran TSU 120 (PN 1202129L2) is a standalone T1 CSU/DSU multiplexer designed to consolidate voice and data services over a single T1 circuit. It is commonly used in branch office and small enterprise settings for network access and PBX integration.

Technical specifications:
Model: TSU 120
Part number: 1202129L2
Type: T1 multiplexer with internal CSU
T1 interface: 1 × RJ-48C, 1.544 Mbps, full duplex
User ports: 1 × V.35 (DB-25 or 34-pin) for data, 1 × expansion slot for modular voice/data cards
Clocking: Network, internal, or external
Framing: D4 (SF) or ESF
Line coding: AMI or B8ZS
Diagnostics: Built-in loopback (local, remote, network), BER testing
Indicators: LED status for power, test, alarm, network, and port activity
Power supply: 120 V AC, external wall transformer (standard), optional -48 V DC
Mounting: Desktop or wall-mountable
Management: Front-panel configuration, SNMP via optional module
Operating temperature: 0 °C to 50 °C
Dimensions: Approx. 1.75 in (H) × 8.5 in (W) × 9.5 in (D)
Weight: Approx. 1.3 kg
Made in: Canada