The ZyXEL IES-708-22A can act as either a STU-C or a STU-R. The per-port line rate can be configured as 2.3Mbps, 4.096Mbps or 5.69Mbps. When configured as a STU-C, IES-708-22A can work with P-791/P-792 to provide 2-wire G.SHDSL connections, work with P-793 to provide 4-wire G.SHDSL connections, or work with another IES-708-22A (in STU-R mode) to provide 16-wire G.SHDSL connections. If configured as a STU-R, IES-708-22A can work with various SLC line cards in the IES DSLAM portfolio.
With the ATM-based multi-paired bonding feature, IES-708-22A supports up to 8 bonded groups and 8 member links in each group. All upper-layer traffics of a bonded group will be segmented and transmitted over the member links. If one of the member links fails, the conveyed traffic will be moved to other working links; when the failed link recovers, it will seamlessly return to the bonded group and share the transmission of the upper-layer traffic. Within a bonded group, the underlying bit rates of the individual ports can be freely and independently changed by their respective PHY layer. The port-bonding feature not only provides higher symmetric bandwidth to subscribers, but also offers more reliable bandwidth pipes for business applications.
IES-708-22A supports 16-layer and 32-layer TCPAM modulations. Operators can select one of these in "auto" or "force" mode; the former determines the modulation by negotiating with the peer device, while the latter forces the use of configured modulation. In order to avoid the cross-line noise, many Telco operators restrict the power spectrum density for G.SHDSL service but allow the transmission rate of the links to increase. With the dual-modulation feature, the goal will be much easier to realize.
The IES-708-22A comes with complete ATM and Ethernet QoS, as well as various IP QoS features (Packet classification/Rate Limitation/Queue Scheduling). The seamless QoS-mapping not only allows consistent and appropriate traffic treatment of packets, but also enables fulfillment of triple-play services.
The number of the supported multicast groups is 256, while each group can have 9 members. At least 30 multicast IGMP join/leave requests can be processed in one second and the maximum channel processing time is less than 250 ms. For security, anti MAC address spoofing, broadcast storm prevention, MAC count limiting and packet filtering features are provided. Triple-play services like high-speed Internet access, VoIP, Near VOD, Broadcast TV and TV on Demand can be easily provided as well.
Features:
 | 1U-height mini IP DSLAM, each port operates at 5.69Mbps |
| AC (100V - 240V) power input |
| Support both STU-C or STU-R mode |
| ATM-based multi-paired bonding support (G.998.1); bonding up to 8 (45.6Mbps) |
Specifications:
| Standard Compliant | ITU G.shdsl (ITU-T G.991.2 (2004))
Line probing
Annex F (G.bis mode) |
| Chipset | Infineon Socrates-16Bis (one SDC-16i plus 2 x SDFE-4) |
| Line coding | TC-PAM |
| Transmit power | up to 13.5 dBm |
| SHDSL payload format | ATM |
| Rate Adaptation Mode | Fixed, line probing |
| Hardware | 8-port G.SHDSL standalone mini-DSLAM
All front access
1 embedded FAN (4020)
Could be installed on standardized 19' rack
1 x console port: Mini-RJ-11(4P4C)
2 x RJ45 10/100 Mbps (for uplink) |
| Humidity | Operating 10 - 90% (non-condensing)
Storage 10 - 95% (non-condensing) |
| Dimension (W x D x H) | 270 x 350 x 44.45 mm / 10.62 x 13.77 x 1.75" |
| Weight | 3.5 kg / 7.71 lbs |
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