Cisco Systems IGX 8 Spezifikationsblatt PDF herunterladen (Seite 9)

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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.

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Cisco Systems IGX 8 Spezifikationsblatt Seite 9