aculab Prosody X 설치 매뉴얼 - 페이지 12
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페이지 인쇄Prosody X Installation guide
legacy switching equipment which provide the following protocols:
•
DASS2
•
DPNSS
•
SS7
•
All E1 CAS protocols
Each 75 Ohm trunk is normally connected via a pair of coaxial cables with BNC
connectors. A Balun is available to convert between RJ45 and co-axial cabling. The
Balun also converts between 120 and 75 Ohm interfaces, so the system does not
need to be configured for 75 Ohm operation when this type of converter is used.
1.6.3 Cable lengths
Cat 5e cabling is designed for an overall span length of 100m. It is recommended that
the length of either a single point to point cable or the cumulative length of multiple
cables connected via one or more patch panels does not exceed 100m. For span
lengths approaching the 100m recommended limit it is important to specify and install
high quality cables. In particular for 1000BaseT connections, Cat 6 is recommended
for span lengths approaching 100m.
For E1 trunks converted to BNC connectors and co-ax cabling, it is recommended
that overall span length is limited to 100m maximum and that 75 Ohm cabling and
connectors are used.
Span lengths in excess of 100m may continue to operate and in this case the installer
should check that there is adequate margin on signal levels to maintain expected
service levels.
1.7
Ethernet equipment legacy compatibility
The Prosody X IP communication interfaces are designed to operate at Fast Ethernet
(100Base-T) or Gigabit Ethernet (1000Base-T) data rates. If connected to network
equipment that is not Fast Ethernet capable, the interface will attempt to negotiate a
10Base-T link speed. In most cases this will impose an artificially low channel count
on VoIP connections that will limit the Prosody X system capacity.
The Prosody X IP communication interfaces should not be connected directly to
legacy "hub" (half duplex) network equipment.
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Figure 1-7 75 Ohm E1 Balun
CAUTION