• DSU functionality integrated with an intelligent CSU in a compact package

  • Connection to LAN/WAN, CAD/CAM, or Hosts to E1 Network Services

  • Up to 31 WAN ports with aggregate data rate of 2.048M bps

  • Each rack card shares a controller card with front panel keys and 2-line by 40-character LCD display, with Ethernet port supporting Telnet and optional SNMP

  • Remote configuration and diagnostics capabilities

  • 16 cards per rack

  • Multi-color LED indicators per card.

  • Compliance with:
    ITU G.703, G.704, G.706, G.732, G.736, G.823
    ETSI ETS 300420, and ETS300419
    EMI/EMC - EN50082-1 EN55022 Class A
    Safety - EN60950

Loop Telecom's Loop-E1500 FE1 CSU/DSU product series provide an economic solution to E1 network
access cost, when only a partial of 31 DS0 channels is needed. Clear channel (32 DS0 channels) is also
available. This product series provide continuous error checking, performance polling, and in-service
diagnostics. With DTE port operating from 56 Kbps to 1984 Kbps, Loop-E1500 FE1 CSU/DSU enables
users to interconnect LANs and WANs, CAD and CAM, video conference, mainframe hosts, and others.
This FE1 CSU/DSU rack card is intended to be plugged into Loop's rack cage Loop-C5500 for central
office use. A stand-alone version is also available and is intended for customer premises installation. For
central LAN to several remote LAN’s over E1’s, a low cost solution is also available. Thus, the E1500
bridge or router card can work opposite Loop IP6610 providing end-to-end enterprise internetworking
solution with central SNMP capabilities over E1 or fractional E1.
From the shared common controller card of the rack cage, Loop-E supports configuration and diagnostics
using keypads and LCD display on the front panel, or from a local or remote terminal. This enables users to
execute in-service diagnostics and fault isolation. Ten LEDs on the front panel provide both line side and
DTE side status indicators. Using SNMP Network Management Systems and Telnet connection, users
can remotely control and diagnose Loop-E products from anywhere.

Ordering Information

To specify options, choose from list below:

Note: RoHS compliant units are identified by the letter G appearing immediately at the end of ordering code.


(non RoHS compliant)

(RoHS compliant)





V.35 DTE interface with M34 connector




V.35 DTE interface with DB25S connector




EIA530 DTE interface




X.21 DTE interface




RS232 DTE interface




RS449 DTE interface via conversion cable




E1 interface



Not available

Co-directional interface with RJ48 connector




Router interface




Bridge interface

ww = 75 for 75 ohm E1 interface 120 for 120 ohm E1 interface


Loop-E1500-IR-RT = Router interface

Enter and submit form and we will contact you straight away:


Loop-E1500 FE1 CSU/DSU SERIES PRODUCT SPECIFICATIONS (Rack Card) Network Line Interface (E1)

Line Rate

2.048 Mbps ± 50 ppm


ITU G.823

Data Rate Line Code Framing Output Signal Input Signal

User configurable: n x 64Kbps (n=1 to 31) – ITU G.704 2048Kbps (clear channel) – ITU G.703 AMI/ HDB3 (selectable) ITU G.704, Unframed clear channel ITU G.703 ITU G.703

Connector Compliance

BNC (75 ohm), RJ48C (120 ohm, twisted pair) – see ordering option ITU G.703, ITU G.704 (E1 unframed, E1 framed)

Data Port Interface

Data Port Data Rate Connector

Single DTE per card, 16 cards per rack n ∗ (56 or 64) Kbps ( n = 1 - 32 ) M34 for V.35

M34 for V.35 via conversion cable

DB25S for V.35, RS232, and EIA530 DB15S for X.21

DB37S for RS449 via conversion cable

Co-directional Interface

Interface Line Distance Loopback Impedance Connector

ITU G.703 64 Kbps co-directionUp to 500 meters DTE Payload Loopback, DTE to 120ohm RJ48

al interface Line Loopback

Router Interface

Number of port Physical Interface Routing Protocol Data Rates Supporting Protocols Management Connector

1 10/100 BaseT 1 RIP-I, RIP-II n x 64 Kbps up to E1 capacity (nTCP/IP, PPP, NAT VT-100, SNMP, LCD Panel RJ45

=1 to 31)

WAN Interface

Number of ports Date Rate Protocol

Up to 31 WAN ports Each WAN port has data rate nXLayer-two protocol: HDLC, PPP

64K bps, 1≤ n ≤32

Functions The total bandwidth of all 31 WAN ports is up to 2.048Mbps Each interface can be configured as a bridge port or router port
Bridge Interface
Number of port 1 Physical Interface 10/100 BaseT; IEEE802.3 Bridge protocol HDLC encapsulation without Ethernet FCS Data Rates N x 64 Kbps up to full E1 capacity (N = 1..32) Ethernet functions Auto MDI/MDIX
Auto-negotiation (10/100M) Full/half duplex IEEE802.1d self learning, up to 4K MAC addresses
VLAN Transparent and extended frame size of 1532bytes Connector RJ45 Compatibility E1500 standalone, IP-6610 bridge/router
DS0 Mapping
Maps 2 sets of DS0 maps with provision for timed automatic switching between the 2 maps Remote Send Send active DS0 maps to remote site
Performance Monitor
Performance Store Last 24 hours performance in 15-minute intervals and last 7 days in 24-hour summary line, user, and remote site Performance Reports Date & Time, Errored Second, Degraded Minutes, Unavailable Second, Bursty Errored Second, Severe Errored Second, Controlled Slip Second, and Loss of Frame Count Alarm History Date & Time, Alarm Type (i.e. Master Clock Loss, RAI, AIS, LOS, BPV, ES, CSS), and Location
(i.e. line, DTE) Alarm Queue Maximum 40 alarm records which record the latest alarm type, location, and date & time Threshold Bursty Seconds, Severely Errored Second, Degraded Minutes
System Configuration Parameters (All in non-volatile memory)
Active Configuration Current working configuration Stored Configuration User stored configuration Default Configuration Manufacture default configuration (permanent)
Diagnostics Test
Loopbacks Line Loopback, Payload Loopback, Local Loopback, DTE Loopback, Router Loopback Test Pattern 215-1 PRBS, 3-in-24, 1-in-8, 2-in-8, 1:1 patterns Idle Channel Use of idle channel to perform PRBS diagnostic test Remote Loopback Line Loopback, Payload Loopback and
DTE Channel Loopback (V.54 and Loop proprietary)
Front Panel
Multicolor LED indicators
Dimensions 29.5 x 2.7 x 17 cm, 12" x1 " x 7" (WxHxD) Power 24 - 48 Vdc, 5 watts per cardMounting Plugs into Loop-C 5500 each rack cage can have 16 plug-in units,
plus controller card Temperature 0-50°C Humidity 0-95% RH (non-condensing)
Standard Compliance
ITU G.703, G.704, G.706, G.732, G.736, G.823 ETSI ETS 300420, ETS 300419
Certification Compliance
EMI/EMC EN55022 Class A, FCC15 Class A , EN55024 Safety EN60950


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