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Modem-converter E1-L/B
(stand-alone model)

Discontinued, recommended replacement is: E1-L/M


Modem E1-L
Modem E1-L/B
(standalone version)
  • 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 user data interface
  • Full duplex synchronous mode
  • Selectable data rates
  • Digital port loopback, local and remote link loopbacks
  • Integrated BER tester
  • Supervisory (console) RS-232 port
  • Dry contacts alarm interface
  • Construction: stand-alone
  • 220 VAC or 48/60 VDC power
  • Certificate

The E1-L/B 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/B also supports unframed E1 channels.

E1-L/B device may be ordered with Ethernet, V.35 or multistandard digital interface. The multistandard interface is cable-switchable to RS-232, RS-530, RS-449 or V.35 standards. The V.35 interface uses standard M34 female connector.

Devices may be AC or DC powered (176 to 264VAC at 50Hz or 36 to 72VDC).

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

The E1-L/B device may be configured by DIP switches or from console.
Link testing and loopback control may be performed both from console and from front panel.

When in framed mode of operation, the remote login feature for access the remote E1-L/S or E1-XL device's console is available for E1-L/B-ETV device.

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/B-ETV device.

The state of the E1-L/B-ETV device 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/B-ETV device.


E1 Interface
Line Code (E1-L/B) HDB3
Line Code (E1-L/B-ETV) HDB3 or AMI
Line Impedance (E1-L/B) 120 Ohm (twisted pair) or 75 Ohm (coax cable), jumper selectable
Line Impedance (E1-L/B-ETV) 120 Ohm (twisted pair)
Receive Signal Attenuation Range (E1-L/B) from 0 to -30 dB
Receive Signal Attenuation Range (E1-L/B-ETV) from 0 to -43 dB
Jitter Attenuator On receive, up to 120UIpp attenuation
Frame Structure In acc. to ITU-T G.704. Unframed mode available
Multiframing CRC4, CAS
Frequency Offsets Adjustment Controlled slip buffers in receive path
Connector Type (E1-L/B) Removable terminal board
Connector Type (E1-L/B-ETV) RJ-48 (female)
Digital Interface
Data Rate up to 1984 kbps (framed Nx64 kbps),
or up to 2048 kbps (unframed)
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)
Connector Type (RS-530/RS-232 interface) DB25 (female)
Connector Type (X.21 interface) DB15 (female)
Ethernet Interface
Interface Type 10/100Base-T
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 4224 bytes, including MAC header
Protocols Transparent or Cisco-HDLC bridging IEEE protocol, selected automatically
Quality of Service 8 priority levels
VLAN Support In acc. to IEEE 802.1q
Connector Type RJ-45 (female)
Alarm Interface
Connector Type Mini DIN (female), 6 pins
Relay Contact Current up to 250 mA
Relay Contact Voltage up to 175 VDC
Console Port
Interface Type RS-232 DCE
Serial Protocol Asynchronous 9600 bps, 8 bits/character, 1 stop bit, no parity
Connector Type DB9 (female), 9 pins
Loopbacks Local and remote link loops, digital port loop, activated from console and by front panel switch
BER Tester Activated from console and by front panel switch
Remote Control
Remote Login Available for E1-L/B-ETV
SNMP-based Management Device state monitoring, Sa bit assignment (E1-L/B-ETV)
Dimensions 208 mm x 158 mm x 63 mm
Weight 800 g
Power Source
AC Power Source 176 to 264 VAC, 50 Hz
DC Power Source 36 to 72 VDC
Power Consumption 20 VA Max
Temperature 0 to 50 °ะก
Relative Humidity 0 to 80 %, non-condensing


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

PDF  E1-L/B (V.35/RS-530/RS-449/RS-232/X.21 interface). User's Manual in Russian
PDF  E1-L/B and E1-L/R (V.35/RS-530/RS-449/RS-232/X.21 interface). User's Manual in English
PDF  E1-L/B-ETV modem (Ethernet 10/100BaseT interface). User's Manual in Russian
PDF  E1-L/B-ETH and E1-L/R-ETH, Ethernet 10BaseT interface (discontinued). User's Manual in Russian
MIB  MIB files for SNMP management
PDF  Cronyx interface cables guide

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