Bits-Mux E1 Multiplexer Nx64k
  • Reliable and cost-efficient Nx64 kbps access
  • Multiplexer with 2 Mbps G.703/E1 output port
  • Up to 4 Nx64 kbps input ports (X.21, V.36/V.35)
  • Optional FE1 drop and insert port

The Bits-Mux is a scalable access multiplexer concentrating different Nx64 kbps channels onto a G.703/E1 interface. The Bits-Mux is available in different configurations, offering the closest possible match to different user needs. These configurations range from a simple interface/rate adapter to a four input-port multiplexer with add and drop FE1 interface.

The Bits-Mux comes in a dual-slot housing which accomodates a main module and an optional extension module. The main module offers a G.703/E1 interface and a Nx64kbps (X.21 or V.36/V.35) port. Optionally it can also contain a drop and insert G.703/FE1 interface. The extension module allows to increase the number of input ports with three supplementary Nx64 kbps interfaces (X.21 or V.36/V.35). 

Typical applications are found when different users can share the same 2 Mbps line, reducing to a large extent the communication costs. It could include the combination of LAN traffic, PABX traffic, videophony, etc. These 2 Mbps trunk lines are commonly found in environments with HDSL technology (e.g. Telindus Crocus HDSL), cross-connect systems, SDH, or wireless local loop.

The user interacts with the Bits-Mux using a VT100 user-interface, which allows for configuration and maintenance. Both the local and remote equipment can be configured using this interface. Built-in maintenance features of the Bits-Mux include CRC support, continuous quality analysis, tracing of alarm conditions, loop settings, etc.

The Bits-Mux used as interface/rate adapter

The Bits-Mux in a four Nx64 kbps (X.21 or V.36/V.35) input port configuration

Technical Data

Main module

• E1 output port (DTE):

- G.704/E1 framing, CRC-4 support
- 120 ohm (RJ45)
- 75 ohm (1.6/5.6 connector) 
- signal sensitivity > 6 dB at 1 MHz

• FE1 drop & insert (DTE, optional):

- G.704/E1 framing, CRC-4 support
- 120 ohm (RJ45; the impedance can be strapped on the card to 75 ohm)
- signal sensitivity > 36 dB at 1 MHz

• Nx64 kbps interface (DCE, interface to be specified):

- X21: V.11, ISO 4903 (DB15 female)
- V36: V.11, ISO 4902 (DB37 female) 
- V35: V.11, V.28, ISO 4902 (with adapter cable to DB37 female) 
- User speeds: Nx64 kbps (N=1..31)

• control port (DCE): 

- RS232: (DB9, female)
- Local and remote configuration
- Quality analysis (Q.821) and historical statistics

Extension Module

• Three identical Nx64 kbps interfaces (DCE, interface type to be specified):

- X21: V.11, ISO 4903 (DB15 female)
- V36: V.11, ISO 4902 (DB37 female) 
- V35: V.11, V.10, ISO 4902 (with adapter cable to DB37 female) 

Synchronisation:

• Internal clock 2.048 Mhz 50 ppm
• slaved to the E1 output port (FR1)
• slaved to the FE1 drop & insert option (FR2)
• synchronisation to the Nx64 kbps port of the main module (CH1).
• Automatric fall-back to internal clock in case a loss of clock-signal is detected

Testloops:

• Loops on the main E1 port

- affect the complete 2 Mbit/s stream
- initiated from front-panel, control port
- local analog loop (loop3), local digital Loop (loop2), remote digital loop (remote loop2)

• Loops on to the Nx64 kbps port of the main module (CH1)

- affect the data on CH1 only
- initiated from the control port
- local analog loop (loop3), local digital Loop (loop2), remote digital loop (remote loop2)

The Bits-Mux in a Nx64 kbps (X.21 or V.36/V.35) and FE1 input port configuration

 

The Bits-Mux in a four Nx64 kbps (X.21 or V.36/V.35) and FE1 input port configuration

Quality analysis:

• G.821 analysis based on CRC-4 (white book) for the main E1 and FE1 drop and insert interface
• Historical data available for the last 24 hours

Front panel :

• Loop buttons for local and remote loop
• Indications:
Power, local analog loop, local digital loop, remote digital loop, Loss of Incoming Signal (LIS), Alarm Indication Signal (AIS), Loss of Frame Alignment (LFA), Remote Alarm Indication (RAI), Receive Quality (Q) and CRC-4 Frame Alignment (CFA)

Conformity:

• FE1: G.703, G.704, G.706, G.823, G.821, G.723, G.735, G.736
• Dataport: X21, V36, V10-V11
• EMC / EMI conform to EN 50081-1 & EN 50082-1
• Safety conform to EN 60950 & EN 41003

Mechanical data:

• W x H x D: 264 x 57 x 228 mm
• Weight (fully equipped unit): 2.6 kg

Desktop power requirements (fully equipped unit):

• External 100-230 VAC (50 - 60Hz), 10W

Sales items:

146.556 DX_LFM_V36_BT Desktop unit with main module (V.36/V.35 input port)
163.088 DX_LFM_V36_DT Desktop unit with main module (V.36/V.35 and FE1 add & drop)
146.555 DX_LFM_X21_BT Desktop unit with main module (X.21 input port)
163.086 DX_LFM_X21_DT Desktop unit with main module (X.21 and FE1 add & drop)
146.561 DX_EXT_X21T Extension module with three X.21 interfaces (for desktop only)
146.562 DX_EXT_V36T Extension module with three V.36/V.35 interfaces (for desktop only)
146.560 DX_LFM_V36_BR Rackmount unit with V.36/V.35 input port
146.559 DX_LFM_X21_BR Rackmount unit with X.21 input port
151.423 DX_LFM_V36_DR Rackmount unit with V.36/V.35 and FE1 add & drop
151.422 DX_LFM_X21_DR Rackmount unit with X.21 and FE1 add & drop
146.563 DX_PR_RACK Subrack for up to 12 rackmount units (10 with power redundancy)
146.564 DX_PR_PWR_AC Power module 100..240 Vac for subrack (2 units for redundancy) 
155.784 DX_PR_PWR_DC Power module 48Vdc for subrack (2 units for redundancy)

Bits-Mux (X.21 extension module mounted)

Note: Telindus may make improvements and/or changes in the products described above at any time, without notice and shall in no way be held responsible for errors in this document.

163246 V1

Crocus SDSL Quad

The Crocus SDSL quad combines high-speed xDSL connectivity with access concentration on a channelised E1 interface. It is ideally suited to environments where a concentration of remote users is required whilst minimising the number of interfaces towards the backbone equipment. The reduced number of interfaces on the backbone device drastically limits the cost and the dimensions of this backbone equipment.


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