Service manual

8
Network and TS interfaces
1
Introduction
◆
Network and TS interfaces
Network/TS interfaces The following network/TS interfaces can be ordered for the S
TELLAR
:
• E1 input
• E3 input
• DS3 input
• SPI input
• ASI input
• V.35 input
• ASI restamping output
• SMPTE 310M output
Stellar Dual input The input interfaces (apart from the V.35 input) provide a dual input facility support-
ing transmission path duplication. The user can enable the autoswitching facility, so
the S
TELLAR
switches automatically to the other input in case of a network failure.
For information on the network switching criteria, see Setting up the network input,
p. 77.
When the autoswitching function is disabled the user can enable either of the two
inputs.
E1 input The E1 input accepts both framed and unframed transport stream inputs according to
user selection. Framing is according to G.704. The S
TELLAR
automatically detects
the transport stream format as 188 or 204 bytes packet lengths and performs RS
(204,188) error correction when FEC is included in the transport stream.
E3 input The E3 input accepts both framed and unframed transport stream inputs according to
user selection. Framing is according to G.832. The S
TELLAR
automatically detects
the transport stream format as 188 or 204 bytes packet lengths and performs RS
(204,188) error correction when FEC is included in the transport stream.
DS3 input The DS3 input accepts both framed and unframed transport stream inputs according
to user selection. Framing is according to G.804 or G.752. The S
TELLAR
automati-
cally detects the transport stream format as 188 or 204 bytes packet lengths and per-
forms RS (204,188) error correction when FEC is included in the transport stream.
SPI input When installed with the SPI input the S
TELLAR
automatically detects the transport
stream format as 188 or 204 bytes packet lengths and performs RS (204,188) error
correction when FEC is included in the transport stream.
V.35 input When installed with the V.35 TS input option the S
TELLAR
can decode a V.35 signal
originally transmitted on 1 to 5 E1 or on 1 to 6 T1 lines via a set of inverse multiplex-
ers (I-MUXes). From an I-MUX the V.35 TS input option receives a serial data bit
stream and automatically detects the transport stream format as 188 or 204 byte pack-
ets and performs RS (204,188) error correction if FEC is included in the transport
stream.