Functional Description
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CP525 cMux User’s Manual Rev. 5.20.12 (3944)
output. The input streams can be either SPTS or MPTS and streams with or without RTP layer
are accepted.
The muliplexer can generate one output multiplex and the operator chooses whether to transmit
this stream over IP or not. The transport stream can be transmitted to up to 8 IP destinations.
Two Ethernet interfaces can be used simultaneously for video carriage, the interfaces are bi-
directional. When using the SFP slot, one of the Electrical interfaces will be disabled.
5.6.2 Protocol mapping
Ethernet
14 bytes
[IEEE 802.3/802.3u]
IP
20 bytes
[RFC 769]
Optional
VLAN
4 bytes
[802.1q]
UDP
8 bytes
(RFC 768)
RTP
12 bytes
(RFC 1889)
1-7 MPEG TS packets
188
– 1316 bytes
[
ISO/IEC 13818-1
]
Figure 5.2
Protocol mapping
When transmitting and receiving MPEG transport streams over IP, the protocol mapping is
according to figure
. The VLAN framing and RTP encapsulation are optional.
The RTP layer is important for diagnosing network related problems, since it contains a sequence
number that can be used for packet loss detection.
The maximum transfer unit (MTU) for Ethernet is usually 1500 bytes. This limits the number of
transport stream packets to embed into the outgoing Ethernet/IP frames to be between 1 and
7.
5.7 Management sub-system
The management subsystem is a set of modules that handles all the interfaces to monitor and
control the operation of the CP525.
The management subsystem communicates with the users, both humans and machines, via the
following interfaces:
•
Front panel and back panel LEDs for status
•
Graphical user interface via Flash application in WEB browser
•
SNMP traps on alarms
•
SNMPv2c Agent
•
TXP (T-VIPS XML Protocol) to retrieve and set configuration and status
•
Alarm relays on alarms
•
SNTP client for real time clock synchronisation
•
Terminal interface either over Telnet or USB interface for debugging
•
FTP server for direct file system access
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