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Modem-converter E1-L/M
(Mini box)


Modem E1-L/M

  • ITU-T G.703, G.704, G.706 and G.823 compliant
  • Up to 2 km
  • CAS and CRC4 multiframing
  • Ethernet or V.35/RS-530/RS-449/RS-232/X.21 user data interface
  • Selectable data rates
  • Digital port loopback, local and remote link loopbacks
  • Integrated BER tester
  • Supervisory (console) RS-232 port
  • 48/60 VDC power
  • Certificate

The E1-L/M is a fractional E1 access device, for transmitting digital data over framed (ITU-T G.704) E1 channels. Digital data port rates are selectable for any multiple of 64 kbps up to 1984 kbps. User data occupies only the required number of E1 frame timeslots reducing billing to only bandwidth used. E1-L/M also supports unframed E1 channels.

Model E1-L/M is stand-alone (in the metal case of type Mini).

The E1-L/M product is available in three versions of digital interface:

  • E1-L/M-ETV - Ethernet 10/100Base-T interface;
  • E1-L/M-V - V.35 interface;
  • E1-L/M-M - multistandard digital interface (V.35/RS-530/RS-449/RS-232/X.21).

Devices DC powered 36 to 72 VDC.
Possible AC Power Source 176 to 264 VAC from external Power adapter Cronyx AC-DC-48)

Device operation may be controlled via console port (RS-232 port for supervisory terminal connection).

The E1-L/M devices may be configured by DIP switches or from console.
Link testing and loopback control may be performed from console.

When in framed mode of operation, the remote login feature for access the remote E1-L/M device's console is available for E1-L/M devices.

So-called monitoring channel is used (in framed mode only) for accessing the remote device status information and for remote login operation. The Sa4 bit of the timeslot 0 of the E1 frame is used for the monitoring channel operation (according to the ITU-T G.704 Recommendation). In addition, any bit of any timeslot may be assigned for the monitoring channel operation for E1-L/M devices.

The state of the E1-L/M devices may be monitored by SNMP protocol via IP network. The desired Sa bit for monitoring channel operation may be assigned by the SNMP for E1-L/M devices.


The typical scheme of application E1-L/M

The scheme of application of modem E1-L/M together with a router

Order codes:

Currently available models are listed in Prices. Please, contact technical support if you are unsure which model to choose.


E1 Interface
Connector Type RJ-48 (female 8 pin)
Line Code HDB3 or AMI
Frame Structure In acc. to ITU-T G.704, Multiframing: CRC4, CAS. Unframed mode available
Frequency Offsets Adjustment Controlled slip buffers in receive path
Line Impedance 120 Ohm (twisted pair)
Receive Signal Attenuation Range from 0 to -43 dB
Jitter Attenuator On receive
Digital Interface: V.35/RS-530/RS-449/RS-232/X.21
Data Rate up to 1984 kbps (framed Nx64 kbps),
or up to 2048 kbps (unframed), for RS-232 up to 128kbps
Clock Signals Supported TXC, RXC, ETC, ERC
Modem Control Signals DTR, DSR, CTS, RTS, CD
Connector Type (multistandard interface) HDB44 (female)
Connector Type (V.35 interface) M-34 (female)
Ethernet Interface
Interface Type IEEE 802.3 10BASE-T or 100BASE-T (100BASE-TX)
Connector Type RJ-45 (female)
Data Transfer Rate up to 1984 kbps (framed Nx64 kbps),
or up to 2048 kbps (unframed)
Mode 100 Mbps full duplex,
100 Mbps half duplex,
10 Mbps full duplex,
10 Mbps half duplex,
or autonegotiation
Address Table Size 15000 MAC addresses
Maximum Packet Size 1600 bytes, including MAC header
VLAN Support In acc. to IEEE 802.1q
Protocols Transparent or Cisco-HDLC bridging IEEE protocol, selected automatically
Console Port
Serial Protocol Asynchronous 9600 bps, 8 bits/character, 1 stop bit, no parity
Modem Control Signals DTR, DSR, CTS, RTS, CD
Interface Type RS-232 DCE
Connector Type DB9 (female), 9 pins
SNMP Interface (option «-SNMP»)
Interface Type Ethernet 10Base-T
Connector Type RJ-45 (female)
Loopbacks Local and remote E1 link loops, digital port loop
BER Tester Integrated
Control from Console Port or Remote Login; SNMP-based Management(«-SNMP»)
Dimensions 180 mm x 156 mm x 36 mm
Weight 0,7 kg
Power Source
DC Power Source 36 to 72 VDC
(possible AC Power Source 176 to 264 VAC from Cronyx AC-DC-48)
Power Consumption 20 VA Max
Temperature 0 to +50 °С
Temperature of storing -40 to +85 °С
Relative Humidity 0 to 80 %, non-condensing


Some of the documents are in Adobe® Acrobat® Reader® format

PDF  E1-L/M. User's Manual in Russian
PDF  E1-L/M-ETV. User's Manual in Russian
MIB  MIB files for SNMP management
PDF  Cronyx interface cables guide

Return to G.703 Interface Converters or Digital Communication Equipment

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