Paradyne COMSPHERE 3610, Operator'S Manual

Page: 23 / 310

Introduction
1-7 3610-A2-GB91-90 July 1999
The asynchronous word size supported with the
Single-Port Async/Sync feature is 6 to 10 bits, excluding
stop and start bits, for a maximum allowable character
size of 12 bits. In addition, the DSU is V.14 compatible so
the DSU port can run overspeed or underspeed by the
percentage specified by the V.14 requirements. Table 1-3
provides these percentages. For example, if the character
size is 10, the maximum overspeed allowed for the
transmitter is 1.023 times ( x ) the asynchronous rate.
Multipoint Configuration
When operating with the Async
→
Sync configuration
option enabled, a single-port multipoint circuit can
operate using nondisruptive diagnostics, similar to a
single-port point-to-point configuration. Figure 1-2
illustrates this configuration. Note that both the control
and tributary DSUs have single-port async/sync capability
and are configured the same, with the same rate set for
both the DSU and DTE ports. Refer to
Table 1-2 to
determine the maximum diagnostic rate that can be run
for various single-port async/sync configurations, and
Table 1-3 to determine the overspeed or underspeed
percentage at which the DSU port can operate.
Table 1-3
V.14 DTE Overspeed/
Underspeed Percentages
Character Size % Over/Underspeed
8 3.1
8 –2.5
9 2.7
9 –2.5
10 2.3
10 –2.5
11 2.1
11 –2.5
12 2.0
12 –2.5
Figure 1-2. Single-Port Multipoint Circuit with Nondisruptive Diagnostics