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This document describes cabling requirements for connecting the Cisco 6920 RateMux Multiplexer with third-party equipment.
Most cable headends use integrated receiver transcoders (IRTs) from General Instrument (now part of Motorola) to receive digital programming from AT&T Headend in the Sky (HITS) and other satellite-based distributors. The IRT, which decrypts and demodulates the QPSK feed, has a DHEI (26-pin connector) output that can be interconnected with the Cisco 6920 DHEI Input or I/O module (15-pin connectors) using the CAB-6920-DHEI-Input cable. A CAB-6920-DHEI-Input cable can also be used to connect the Cisco 6920 DHEI I/O module output (15-pin connector) to the IRT DHEI input (26-pin connector) for reencryption and QAM modulation of the newly stat-muxed transport stream for distribution through the cable plant. (See Figure 1.)
Motorola/GI has recently revamped their digital headend product offering with the introduction of their Modular Processing System (MPS), which can contain modules that decrypt, demodulate, remultiplex, reencrypt, and remodulate digital video streams. An additional DHEI or DVB-ASI module is used to interconnect the MPS to the Cisco 6920. Motorola/GI is also introducing a new DSR 4400 satellite demodulator. Both of these products use 15-pin connectors for DHEI rather than the 26-pin connectors used in the IRTs.
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Note Cisco does not provide the interconnect cables between the Cisco 6920 and these products. The appropriate DHEI (15-pin to 15-pin) cables are available from Motorola as an accessory. |
Many cable headends also use multiple decryption receivers (MDRs) from Scientific-Atlanta to receive digital programming from Time Warner's Athena or other satellite-based distributors. The MDR, which decrypts and demodulates the QPSK feed, has a DHEI (26-pin connector) output that can be interconnected with the Cisco 6920 DHEI Input or I/O module (15-pin connectors) using the CAB-6920-DHEI-Output cable.
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Note It is the DHEI output cable and not the DHEI input cable (as was the case with the Motorola IRT). |
The newly stat-muxed output of the Cisco 6920 can be forwarded to a Scientific-Atlanta encryptor/modulator (for example, the D9476) via DHEI (through the 15-pin DHEI I/O output connection) with CAB-6920-DHEI-Input cable or more commonly via DVB-ASI (through the DVB-IO module). (See Figure 2.)
Scientific-Atlanta has recently introduced a new high-density multiple QAM modulator (MQAM), that supports up to four 6-MHz QAM 256 outputs in a single rack unit. Due to the MQAM's limit of only two DVB-ASI input ports (the MQAM does not support DHEI interfaces), the Cisco 6920 cannot fully utilize the MQAM's bandwidth requirements through the existing DVB I/O card outputs. However, the Cisco 6920's new dual DVB-I/O cards are designed so that the card's pair of DVB output ports can be connected to the MQAM's two DVB-ASI input ports with standard DVB cables to fully drive the MQAM.
Other headend equipment manufacturers produce equipment that typically uses only the DVB-ASI protocol. Should you encounter a satellite demodulator, MPEG encoder, or multiplexer that is to be connected to the Cisco 6920 via DHEI, keep in mind that Cisco provides cabling only for the 26-pin-to-15-pin conversion. Any 15-pin-to-15-pin cabling must be acquired from the equipment vendor and not from Cisco.
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This document is to be used in conjunction with the Cisco 6920 RateMux Multiplexer Installation Guide.
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