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Quad Gigabit Ethernet Fiber Transceiver

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The 7708GT-4 is a VistaLINK®-capable Quad Gigabit Ethernet Fiber Transceiver for up to four independent 10/100/1000BaseT Ethernet channels over optical fiber. Monitoring of card status and parameters are provided locally at the card edge and remotely via VistaLINK®. A pair of 7708GT-4 transceivers permit full duplex communication of all four channels up to 1GB/s each over a pair of optical fibers.

The 7708GT-4 occupies one card slot and can be housed in the 1RU 7801FR frame which holds up to four single or two dual slot modules, the 3RU 7800FR frame which has a 15 slot capacity, the portable 3RU 350FR frame which has a 7 slot capacity, or a standalone enclosure which holds a single module.


  • Four completely independent and isolated Ethernet streams
  • Low latency
  • Auto negotiation for 10/100/1000 speeds on all ports
  • Comprehensive signal and card status monitoring via four digit card edge display or remotely through SNMP and VistaLINK®
  • VistaLINK® capable for remote monitoring via SNMP (using VistaLINK® PRO) when installed in 7800FR frame with a 7800FC VistaLINK® Frame Controller
  • Optical output wavelengths at 1310nm, 1550nm and up to sixteen CWDM wavelengths (ITU-T G.694.2 compliant)
  • DWDM wavelengths (ITU-T G.694.1 compliant) also available
  • Fully hot-swappable from front of frame
  • Optical SFP supportable from the rear
  • Status Indication

  • Frame status
  • 10/100/1000 Speed indication on copper ports
  • Full Duplex/Collision indication on copper ports
  • Link activity on copper ports
  • Received optical power level

7708GT-4 Application Configurations

ModelWavelengthOptical Output PowerReceiver SensitivityReceiver Max InputNominal Received WavelengthMax DistanceFiber Type & Connector

**70km on 1590nm and 1610nm

1310nm+0.5dBm-8.5dBm-14dBm+1dBm1310nm10kmSMF, duplex LC/PC
1550nm+4dBm-5dBm-15dBm+1dBm1550nm40kmSMF, duplex LC/PC
1550nm+3dBm0dBm-24dBm-7dBm1550nm80kmSMF, duplex LC/PC
+2dBm-1dBm-14dBm-1dBm1270nm-1610nm40kmSMF, duplex LC/PC
+3dBm0dBm-24dBm-7dBm1270nm-1610nm70/80km**SMF, duplex LC/PC
+3dBm-1dBm-24dBm-7dBm1270nm-1610nm80kmSMF, duplex LC/PC


Ethernet Input/Output

Standard IEEE 802.3 10base-T
802.3u 100base-TX
802.3ab 1000base TX
Connectors 4 RJ45 ports
Cable Requirements
10Base-T UTP category 3, 4, or 5 cable up to 328ft/100m
100Base-T UTP category 5 cable up to 328ft/100m
1000Base-T UTP category 5 cable up to 164/50m
Latency 2ns @ 1GB/s (per link with 1m patch cable)

Ethernet Input/Output

Connector Optical SFP Cage, LC-UPC connectors
Optical SFP 1000 Base X
RJ45 SFP 1000 Base TX


Voltage +12V DC
Power 12 watts


Number of Slots 1


Laser Safety Class 1 laser product
Complies with 24 CFR 1040.10 and 1040.11
IEC 60825-1
EMI/RFI Complies with FCC Part 15, Class A
EU EMC Directive

Ordering Information

Notes Select from optical and SFP options below
7708GT-4 Quad Gigabit Ethernet fiber transceiver, RJ45 ports for Ethernet connection
7708GT-4-F Quad Gigabit Ethernet fiber transceiver, SFP interface for Ethernet connection (SFP's not included)

Ordering Options

Notes Rear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+1RU 1RU rear plate for use with 7701FR Multiframe
+SA Standalone Enclosure Rear Plate
+3RU 3RU rear plate for use with 350FR, 7700FR-C, 7800FR or 7801FR Multiframes


350FR Portable Multiframe which holds 7 single slot modules
7700FR-C 3RU Multiframe which holds 15 single slot modules
7800FR 3RU Multiframe which holds 15 single slot modules
7801FR 1RU Multiframe which holds up to 4 single slot or 2 dual slot modules
7701FR 1RU Multiframe which holds 3 single slot modules
S7701FR 7700 Series Standalone Enclosure

Trunk Optical options

SFP10G-TR13-J 1310nm laser, 10km max, SMF
SFP10G-TR15S 1550nm laser, 40km max, SMF
SFP10G-TR15H 1550nm laser, 80km max, SMF
CWDM & DWDM (Ordering Information)
SFP10G-TRCxx CWDM laser (1470-1610nm), 40km max, SMF
SFP10G-TRCxxH CWDM laser (1470-1610nm), 70km/80km max, SMF
SFP10G-TRDxxxH DWDM laser (ch.20-ch.59), 80km max, SMF

7708GT-4-F Ethernet SFP Options

SFPTR-13 SFP GigE optical tranceiver, 1310nm, SMF, standard sensitivity
SFPTR-Cxx SFP GigE optical transceiver, CWDM (1270-1610nm), SMF, standard sensitivity