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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.
