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Frame Relay Interface
Type of Service: Permanent Virtual Circuit (PVC).
Data Interface: Per ITU-T I.122 and ANSI T1/S1 Standards.
Data Transfer Protocol: LAP-D frame level core functions.
Input Data Format: High Level Data Link (HDLC) protocol.
Input Data Frame Length: Up to 4096 bytes max.
Frame Integrity Check: Frame Check Sequence and CRC check of data frame. If CRC fails,
data frame is discarded at receiving node.
Input Data Rate: 56 Kbps to 2.048 Mbps. (Max. rate available only with one of four
ports/card active).
No. of Ports per Card: 4
No. of PVCs per Port: 252 per FR card, distributed in any combination.
Port Electrical Interface: ITU-T V.35. IGX 8 can act as a DCE or DTE for direction of control
leads and timing.
Data Clocking: Normal or looped.
Virtual Circuit Identifier: Data Link Connection Identifier (DLCI).
Control Protocol: Local Management Interface with XON/XOFF type flow control.
IGX sets FECN and BECN bits in frame relay frame.
Bundled Connections: 252 virtual circuits per card
1024 virtual circuits per node.
Billing Time Accuracy: Upon request from user device, IGX will provide GMT from any
node accurate to within 1 second.
