When the Cisco 1-Port Channelized STM-1/OC-3 SPA Version 2 is configured in SDH framing mode, it supports channelization into 63 independent E1 channels (VC-12 mapping). When configured for SONET framing mode, the SPA supports channelization into 84 independent T1 channels (VT1.5 mapping or CT-3 mapping into STS-1).

Multilink Point-to-Point Protocol (MLPPP) is supported in hardware to enable link aggregation greater than T1. Up to 12 individual T1s can be combined within a multilink bundle that appears to be a single IP link. This feature allows service providers to provision greater-than-T1 bandwidth on an incremental basis, without requiring migration of the circuit and customer-premises-equipment (CPE) infrastructure to T3 facilities. A maximum of 42 multilink bundles can be configured on each SPA, with at least two T1 links in each bundle.

The Cisco 1-Port Channelized STM-1/OC-3 SPA Version 2 is hot-swappable and supports service-transparent online insertion and removal (OIR), allowing removal of the SPA without affecting the carrier card and other SPAs.

More benefits:

The Cisco 1-Port Channelized STM-1/OC-3 SPA Version 2 offers many advantages, including:

●   Support for Channelized OC-3 to T1, Channelized STM-1 to E1, clear channel T3/E3, subrate T3/E3, full-rate T1, clear channel E1, Channelized T1/E1, and fractional T1/E1

●   Up to 84 T1 (or 3 T3) ports, 63 E1 (or 3 E3) ports, or 1024 n x DS-0 channels

●   Support for all major encapsulations including MLPPP and Multilink Frame Relay (MLFR)

●   Support for link fragmentation and interleaving (LFI) over Frame Relay (FRF.12) and MLPPP

●   Support for both 1 + 1 SONET Automatic Protection Switching (APS) and SDH Linear Multiplexer Section Protection (MSP) protocols