Chapter 3 Expansion Modules 69
Reference for Passport 4460 Hardware
2-Port Serial Data Expansion Module
The 2-port Serial Data Expansion Module supports the following:
•
Two serial data ports on one module
•
RS-232/V.24, V.35, V.36, and X.21
•
Auto-sensing DCE or DTE interfaces (when appropriate cable is used)
•
Both ports configurable as WAN ports with external DSU/CSU
•
Provides clock within 100 parts per million (ppm)
•
Two modules supported per Passport 4460 unit
The 2-Port Serial Data Expansion Module will support any protocol.
The following modes must operate at the following speeds:
Both serial data ports have internal clocking capabilities of up to 100 parts per
million. Both ports can be configured as WAN ports with external DSU/CSU
attached.
Mode
Speed
V.35/V.36/X.21
300 b/s to T1/E1 speeds
Nx64
Up to 2.048 Mb/s
RS-232/V.24
300 b/s to 128 Kb/s
Note:
On Passport 4460 units supporting master clocking, only the first
of the two ports can supply clock to the backplane. However, both ports
can receive clock from the backplane.
Содержание Passport 4460
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