Frame Generator Module With Clock Bypass Switch Block S2 - Symmetricom TSG-3800 Series User Manual

CPU, Frame Generator, and Clock Modules
T1/E1 Frame Generator Module with Clock Bypass
The T1/E1 Frame Generator Module has two timing signal outputs. Output 1 is
controlled by Rocker 1. In the OFF position, Output 1 is a framed E1 signal. This
balanced TTL level signal is used by the AMI Output Module (23478309-xxx-0) to
produce a bipolar E1 timing signal. The ON position of Rocker 1 selects a framed T1
signal for output. Like the E1 signal, the T1 signal is a balanced TTL level signal, but
with T1 framing and frequency.
Rocker 2 of S3 controls the duty cycle of the Composite Clock timing signal. In the
OFF position, the Composite Clock duty cycle is set to 50/50, that is, the period of a
mark and of a space is half of the period of the 64 kHz clock (7.81 µs). In the ON
position, the duty cycle of the Composite Clock is 63/37, or 9.77 µs for a mark and
5.86 µs for a space.
Rockers 3 and 4 function together to select a signal for output through Output 2. As
shown in Table
4 is in the OFF position, Rocker 3 selects either an 8 kHz clock (with Rocker 3 OFF),
or a Composite Clock timing signal (with Rocker 3 ON). When Rocker 4 is ON,
Rocker 3 selects either a 1.544 MHz clock (with Rocker 3 OFF), or a framed E1
timing signal (with Rocker 3 ON). Rockers 5 and 6 are not used.
Setting Switch Block S2
S2 is located approximately in the center of the module (see
block of rocker switches controls the T1 and E1 frame generators, allowing you to
customize some of the outputs. Features such as framing formats and error
messages can be enabled, disabled, or changed, depending upon the application.
Table 6-21 summarizes the functions controlled by S2. The conventional North
American application is 63/37.
Table 6-21. Frame Generator Module with Clock Bypass Switch Block S2
Rocker
1 Select CRC4 (E1)
2 Select signaling (E1)
3 Select Encoding (E1)
4 (not used)
5 Select Multiframe format (T1)
6 Select SSM (T1)
The rocker switches in S2 are separated into two groups. Rockers 1 through 3 allow
customizing of the E1 frame generator, while Rocker 5 and Rocker 6 control the T1
framing. Rocker 4 is currently not used.
200 TSG-3800 User's Guide
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6-20, four signals are available for output through this port. If Rocker
Function
Figure
Off On
Enabled Disabled
CCS CAS
HDB3 AMI
ESF D4
Enable Disable
12778474-002-2 Revision F – March 2004
6-11). This