A 4-port Gigabit Ethernet switch option is available. This extends the base modem
Ethernet traffic port with another 3 Ethernet ports, creating a 4-port switch.
Ethernet speed, duplex and cable termination (crossover versus straight-through) are
auto-negotiated. Speed and duplex can be set to fixed values if desired.
5.3 Hardware Options
5.3.1 Terrestrial Interface Option Cards
One interface position is available for fitting a terrestrial interface card. Any of the
following option cards may be fitted in these interface positions (note that fitting duplicate
cards of the same type is not supported).
5.3.1.1 4-port Gigabit Ethernet Switch
The 4-port Gigabit Ethernet switch card (part number P3718) extends the base modem
Ethernet traffic port with three further RJ45 Ethernet ports, creating a 4-port switch.
5.3.1.2 G.703 Option Card
The G.703 option card (part number P3722) provides support for G.703 E1/T1, E2/T2 and
E3/T3 traffic rates. Unbalanced G.703 is provided on two BNC 75Ω sockets and balanced
G.703 is provided on two RJ45 sockets. The following software features are included as
standard with the G.703 option card:
• G.703 clock extension, providing a high-stability reference clock over satellite
(alternative to GPS). In this mode the G.703 card is used purely as a high-stability
clock generator for some other traffic source, such as serial data.
• Timeslot Drop & Insert feature, allowing fractional E1/T1 services.
5.3.1.3 EIA-530 Option Card
The EIA-530 option card (part number P3720) provides selectable RS422, X.21, V.35 and
RS232 operation up to 10Mbps via a 25-way D-type female connector.
5.3.1.4 STM-1/OC-3/Optical Ethernet Option Card
The STM-1/OC-3/Optical Ethernet option card (part number P3723) provides selectable
STM-1, OC-3 and optical Ethernet operation up to 160Mbps. An open-standard SFP cage
is fitted that can be used with a wide range of SFP modules. All optical connector types
(such as LC and SC) and all types of optical cable (single-mode, multi-mode, all
wavelengths) are supported, subject to a compatible SFP module being fitted. Due to the
wide range of optical cabling and connector options, no SFP module is provided with the
card.
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