The Cisco Frame Relay Service Module (FRSM) designed for use with the Cisco MGX 8230, the Cisco MGX 8250, and the Cisco MGX 8850 PXM-1 ATM multiservice edge concentrators, supports serial, channelized, or fractional unchannelized Frame Relay lines. The Cisco MGX-FRSM-HS2/B combines the features and functionality of the existing Cisco MGX-FRSM-HS2 and FRSM-HS1/B plus additional features.