T1 E1 / T3 E3 / OC-3 OC-12 / STM-1 STM-4

STM-1 Mux and Traffic Capture/Analysis

(63 E1 over STM-1 Multiplexer)

stm1 mux


STM-1 Mux is a cost-effective, compact (only 1U high), SDH (Synchronous Digital Hierarchy) multiplexer that is designed for applications in metro and access networks for efficient transport of traditional TDM and emerging data traffic. It provides 63 E1 TDM interfaces in only 1U standard 19" platform. It is applicable for SDH TDM point-to-point network transmission and switching. It can be used in various network topologies such as point-to-point, chain, ring, hub, and mesh networks.

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.

Typical Application with GL's Dual, Quad, and Octal E1 Cards

Shown 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 these signals are 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 E1s can be analyzed, recorded, or listened (126 x 30 = 3780 timeslots).

stm1 mux capture analysis application
Capture and Analysis Application


Shown below is a typical application with GL's other products

stm1 mux with ppp,ima,,mfr,ss7 emulators
STM-1 Mux with other GL applications

Main Features

  • Cost effective access to all 63 E1's in an STM-1 optical signal; two (2) 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 (see diagram below)
  • 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

Typical Applications

stm1 mux point to point application

TUG3-TUG2-TU12 Tributary Channel Numbering

There are several 63 E1 mappings into and from an STM-1 signal. The STM-1 Mux supports all possibilities, including Motorola, Huawei, and Lucent.

stm1 mux sdh signal mappings
TUG3-TUG2-TU12 Tributary Channel Numbering

Technical Specifications

stm mux multiplexer hardware unit
STM-1 Mux Equipment

STM-1 Fiber Optic Port

SDH Interface
Max 1 or 2 STM-1 optical interfaces (1+1 protection supported)
Bit Rate: 155.520 Mbit/s±4.6 ppm
Line Code: Scrambled NRZ
Protection: Unidirectional 1+1 APS, revertive / non-revertive selectable
Wavelength: Default:1310 nm nominal
Option /5:1550 nm nominal
Output Power: Default: Min. -12 dBm
Option /L: Min. -5 dBm
Option /S: Min. -14 dBm
Option /SL: Min. -5 dBm
Sensitivity: Default:-36 dBm
Option /S:-30 dBm
Max Input Power: -3 dBm
Connector: Default:SC
Option /F: FC
Option /S: SC
Spec S-1.1, L-1.1, L-1.2
Single fiber bi-directional interface can be optionally supported
Clock Source Internal, STM-1 Line, External, Tributaries
Dimensions 44 mm x 230 mm x 440 mm (H/D/W)
1U: 440 * 44 *230 (mm)
Net weight 3 kg
Power (AC) (63 E1 over STM-1 multiplexer only): 100 to 240 V 50/60Hz
Power (DC) -48 V (-58 V to -38 V)
or 220 V (110 V) AC or dual power supply
+24V DC
Power consumption </= 15 Watts
Redundancy (63 E1 over STM-1 MultiplexerRP only): Dual -48 V DC inputs, dual internal power conversion modules
Temperature 0 to 50° C
Humidity 0-95% RH (non-condensing)
LAN port RJ-45
RS-485 port DB-9
E1 interface connector RJ-45
Optical Interface connector FC or SC
Number of Optical STM-1 Ports 1 or 2 (second for protection)
Number of E1 channels 63
LCD Display Supported

PDH interface E1 Port
Bit Rate 2.048 Mbps ±50 ppm
Line Code HDB3
Impedance: 75Ω coax/120Ω twisted pair
Framing Unframed
Connector RJ-48 (special wiring for two E1s)
Total Channels 63 E1s
Management Port
Interfaces 10Base-T and RS-485
Ethernet: RJ-45, 10Base-T adopts MDI port
RS-485 Four-line RS-485, default baud rate 2400 (1200, 2400, 4800, 9600, 19200, 38400 selectable), data bit: 8; stop bit: 1; parity: odd; TABS protocol Asynchronous RS-485 data
Protocol SNMP or Q3

Standards Compliance
G.703, G.707, G.781, G.783, G.784, G.798, G.803, G.811, G.813, G.823, G.825, G.826, G.841, G.957


Item No. Item Description
STM 1 Multiplexer / Demultiplexer
w/ 1:1 Fiber Protection
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Specifications are subject to change without notice.