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CHAPTER
Overview 1-1
1
Overview
This chapter describesthe PA-4T+ port adapter and describesits LEDs, cables, andreceptacles. This
chapter contains the following sections:
• Port Adapter Overview, page 1-1
• Synchronous Serial Overview, page 1-3
• Serial Interface Specifications, page 1-4
• Cables and Pinouts, page 1-5
• LEDs, page 1-15
Port Adapter Overview
The PA-4T+ provides the following electrical interfaces: EIA/TIA-232, EIA/TIA-449, EIA-530.
X.21, and V.35. Each interface complies with its specificinterface specifications. The cable attached
to each PA-4T+ port adapter’s interface ports determines its type (EIA/TIA-232, and so forth) and
its mode (data communications equipment [DCE] or data terminal equipment [DTE]).
Note The PA-4T+ provides enhanced performance over the PA-4T. To determine if a PA-4T+ or
PA-4T is installed in your router, view the port adapters’ faceplate labels (refer to Figure 1-1 and
Figure 1-2, respectively) or use the show diag command to view installed interface types.
Figure 1-1 PA-4T+ —Faceplate View
H9704
FAST SERIAL, ENHANCED
EN
TD
TC
RD
RC
LB
CD
TD
TC
RD
RC
LB
CD
TD
TC
RD
RC
LB
CD
TD
TC
RD
RC
LB
CD