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Configuring SDLC Services
1-8
114053 Rev. A
Transmission Capabilities
SDLC supports full- and half-duplex transmissions over leased lines. Full-duplex
data transmissions can occur in both directions (between primary and secondary
link stations) at the same time. Half-duplex transmissions can occur in only one
direction at a time.
SDLC Support over MCT1 Links
Version 11.0 supports SDLC over Multichannel T1 (MCT1) links (connectors
labeled MCT1) for SNA transmission over DLSw wide areas. The router must
contain at least one MCT1 link module and you must select SDLC from the WAN
Protocols window. For more information on configuring MCT1, refer to
Configuring Line Services.
Physical Connections
SDLC communicates with attached SNA/SDLC devices using V.24 (RS-232),
V.35, and X.21 (nonswitched) connections. SDLC supports line speeds up to 64
Kb/sec, depending on the physical connection. For example, V.24 interfaces can
operate at speeds up to 19.2 Kb/sec, while V.35 interfaces can operate at speeds up
to 64 Kb/sec.
Frame Format
SDLC sends and receives three types of frames:
Supervisory frames transmit ready or busy status, control polling, and request
retransmission when an error occurs or when frames arrive out of sequence.
Information frames transmit data.
Unnumbered frames control initialization and status reporting.
Figure 1-4 illustrates the format of SDLC frames.
Figure 1-4. SDLC Frame Format
Flag
Address field Control field
Information
field
Frame-
checking field
Flag
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