Section 4b: G.SHDSL.bis EFM/TDM Modem – E1 V.35 Fast Ethernet

The Comet 163xF EFM/TDM series is DSL modem which takes advantage of the latest G.SHDSL.bis standard, enabling the data to be transmitted from Ethernet, E1 and Nx64k Data interface with speed 5.7M/11.4M over EFM bonded 2/4 wires G.SHDSL.bis link.

It supports up to 15 Mbps per pair of G.SHDSL.bis symmetrical data transmission under extension mode. Along with time-slot assignment feature, Comet 1632F/1634F series provide multiple user interfaces for TDM traffic including E1 and/or Nx64k Data port and also with Ethernet traffic together.



  • Support EFM and TDM Dual Bearer Mode
  • Point to point Ethernet, E1 and Nx64k Data extension over multiple G.SHDSL.bis copper lines
  • All interfaces E1/Nx64k Data/Ethernet can work simultaneously IEEE 802.3ah EFM 2Base-TL bonding technology
  • Compliant with ITU-T G.991.2 standard, TC-PAM 16/32/64/128 line coding
  • 1 or 2 pairs G.SHDSL.bis with 5.7Mbps per pairs
  • Support extension rate up to 15Mbps over a single pair of copper
  • CO and CPE mode selectable
  • Automatic line rate selection with Line Probe enabled
  • Front panel status LED indicators for easy monitoring
  • Easy installation with console, Telnet, WEB GUI and SNMP
  • Front panel test button with BERT for easily loop diagnostic
  • Provides extensive diagnostics, including loopback, G.SHDSL.bis and E1 performance monitoring
  • Easy software upgrade for field-deployed units via TFTP or HTTP
  • DSL line protection for data transmission
  • Ethernet switching and bridging with VLAN prioritization and QoS
  • Optional temperature-controlled FAN
  • Optional Ethernet port surge protection
  • Support security-link feature


  • Comet 1632, 2-wire, 1 E1 G.703, 1 Nx64k Data, 1 Ethernet port
  • Comet 1634, 4-wire, 1 E1 G.703, 1 Nx64k Data, 1 Ethernet port
Line Interface – G.SHDSL.bis
  • Type: 2 or 4-wire
  • Standard: ITU-T G.991.2, ETSI 101 524
  • Bonding protocol: IEEE 802.3ah EFM 2Base-TL
  • Line rate: n x 64Kbps, n=3~89 (2w), 6~178 (4w)
  • Connector: 1xRJ-45
  • Line coding: TC-PAM 16/32/64/128
  • Impedance: 135 ohm
  • ITU K.21 compliant
DTE Interface – Ethernet
  • Ethernet type: 10/100 BaseT
  • Connector: RJ-45
  • Support 802.3x flow control
  • Auto-MDI/MDIX detection
  • Auto-negotiation for speed and duplex
  • Full duplex / Half duplex support
DTE Interface – E1
  • Data Rate: 2.048 Mbps
  • Connector: RJ-45 for balanced E1 120 W
  • (Optional external convert cable for unbalanced 75 W)
  • Line coding: HDB3
  • Framing: Framed /Framed+CRC /Unframed
  • Compliance: ITU-T G.703, G.704, G.706 and G.732
  • Jitter Performance: compliant with ITU-T G.823
DTE Interface – Nx64k Data
  • Data Rate: n x 64Kbps, up to 4.6 Mbps
  • Connector: DB-25 Female with optional adapter cable (V35/X21/RS530)
  • DTE and DCE clock settings
Timing Source Function
  • Synchronous and Plesiochronous dual clock mode
  • Internal clock
  • Received clock from DSL line
  • External clock from DTE interface (E1 or Nx64k Data)
Ethernet L2 function
  • Support 802.1d transparent bridge function
  • Supporting Bridge filter function based on source MAC addresses
  • Scalable per port bandwidth control (Step = 64K, up to 100M)
  • 2K MAC learning address
  • Ethernet packet length up to 1522/*1664 bytes
  • Support 802.3x flow control
  • Provide 802.1q VLAN tagging
  • Support 802.1p QoS facility
  • Configuration via craft port VT-100, Telnet, WEB GUI and SNMP*
  • Multiple Web browsers supported: IE, Firefox, Chrome
  • Console: DB9 connector (RS232C)
  • Support remote management
  • Independent Local and Remote loopback for E1 and Nx64k Data port diagnostic
  • Support Performance Monitoring function
  • Front panel test button for easily loop healthy testing
  • Front panel reset to default button
LED Indicators
  • Comet 1612/1614/1622/1624/1632/1634: PWR, TST, ALM, CPE, DSL1~2, LAN, E1, V35
  • Dual color LED for easily status monitoring
Power Requirement
  • AC/DC, DC/DC external power adapter (12V, 1A)
  • Dual 12VDC power jack input for redundancy
  • Power consumption: 6W
  • CE Approval, EN 55022, 55024, 61000-3
  • CE LVD Safety, IEC-60950-1, EN 60950-1
  • FCC Part 15, CISPR 22, ANSI C63.4
  • ITU-T K.21
  • 200(W) x 150(D) x 39(H) mm
Operating Environment
  • Operation Temperature: 0 o C ~ 50 o C
  • Storage Temperature: -40 o C ~ 70 o C
  • Humidity: 90%, non-condensing