He explained, “As shown below, the STM-1 Mux multiplexes 63 E1 signals into a STM-1 stream, with TU-12 cross-connect capability. As a standard and compact SDH TDM device, the STM-1 multiplexer is best suited to applications where high-density E1 ports are required to interface with an SDH network through STM-1 fiber optic connections. The device can be managed either through the embedded DCC channel within the STM-1 signal, or through the local RJ-45 management interface on the equipment panel. When multiple 63 E1 over STM-1 multiplexers are stacked together, an RS-485 bus may be used to link the units to form a single managed object. There are also alarm indication lights and a LCD screen on the panel for operation monitoring”.
Mr.Kulkarni further explained, “Shown above is a typical application with GL’s Dual, Quad, and Octal E1 Cards. Both directions of an STM-1 signal are received non-intrusively from a satellite link and then demultiplexed by the STM-1 Mux. The E1s are then fed to GL’s E1 Cards for framing and access to voice timeslots. All 126 simplex E1s (63 duplex E1s) can be analyzed, recorded, or heard (126 x 30 = 3780 timeslots)”.
He added, “This architecture is not only very compact, but also quite inexpensive especially with GL’s Octal E1 Cards”.
Cost effective access to all 63 E1’s in an STM–1 optical signal; two are required to non-intrusively access both directions of the optical signal
Standard 63 E1 Mux Configuration for point to point applications
1U height, 19 rack mount size, high integration, compact design
Topologies supported include point to point, chain, ring, hub, and mesh
ADM (Add Drop Mux) function is NOT included
Optional 2 STM -1 optical interfaces for protection switching - one redundant, one online
Optical interface supports ALS (Auto Laser Shutdown) function
Inter-works with popular SDH products of various vendors – Motorola, Lucent, and Huawei
Supports TUG3-TUG2-TU12 tributary channel numbering and time slot numbering
Supports internal, STM-1 line clock, external and tributary clocking modes
LCD display for system configuration and alarm
Supports remote power-off alarming function
Supports online upgrading
Easy commissioning and maintenance, high reliability