Data to Fractional E1

Data to Fractional E1

The FRM220-E1/DATA slide in card DSU/CSU is a digital access unit for Unframed or Fractional E1 services. The FRM220-E1/DATA data channel supports user-selectable transmission rates via selected E1 timeslots, which provides integral multiples of 64kbps or 56kbps, up to a maximum 2.048Mbps (unframed), for a line attenuation of up to 43 dB on twisted pair or coax cable. This  provides an approximate operating range up to 2km (using 22AWG). The FRM220-E1/DATA front panel provides status LEDs for monitoring the CSU and DSU conditions for initiating local and remote loopback with integral BERT. The FRM220-E1/DATA features a Data cable adapter for connection to industry standard routers. When the FRM220-E1/DATA card is Placed in the FRM220 rack with SNMP management, in-band management allows viewing the card and remote converter’s status, type, version, link status, data link status and alarms. Both card and remote can be configured to enable or disable the port, reset the port, set the data rate, modify the clock mode and initiate local or far end loop back test.

Data to Fractional E1 schematic


  • Supports Fractional E1 and Unframed E1 services with V.35/X21/RS530 adapter cable
  • I/O connectors all located on front panel
  • Multiple clock source selection and remote loopback (Internal or External: E1 recovery, DTE or DCE)
  • Unbalanced E1/BNC or balanced E1/RJ45
  • Fully compatible with FRM220-CH20 chassis
  • SNMP management with FRM220-CH20 chassis
  • LED Alarm indication


E1 Interface

Framing: Framed/Unframed
Standard: ITU-T G.703/G.704/G.706 & G.732, G.832
Bit rate: 2.048Mbps± 50ppm
Line code: HDB3
Clock setting: Internal OSC or recovery clock
Receive level: -43dB
Line impedance: 75 ohm (BNC) / 120 ohm (RJ45)
Jitter Performance: Complies with ITU-T G.823
Pulse Mask: Complies with ITU-T G.703
Pulse amplitude: Nominal 2.37V ± 10%
Delay Variance: 8ms
Connector: RJ45, BNC
Diagnostics: Digital remote loopback

Data Interface

Standard: ITU-T
Data rate: Nx56/Nx64
Connector: HDB26F w/ adapter cable for Data

LED's: Power, TD, RD, RTS, DCD, TX Clock loss, Signal loss, Sync loss, Alarm, test error
Power: AC adapter : 100~240VAC to 12VDC, AC 100 ~ 240V, DC -18 ~ 75V
Power Consumption: < 12W
Dimensions: DC12 : 160 x 88 x 24mm (D x W x H), AC/DC48/AD : 201 x 135 x 35mm (D x W x H)
Weight: DC 12 : 280g, AC/DC48/AD : 580g
Temperature: 0 ~ 60°C (Operating), -10 ~ 70°C (Storage)
Humidity: 10 ~ 90% RH (non-condensing)
Certifications: CE, FCC, RoHS
MTBF: 65,000 hrs (25°C)