Switch Block S2 - Symmetricom TSG-3800 Series User Manual

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. In the ON position, 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 S1 controls the duty cycle of the Composite Clock (CC) timing signal. In
the OFF position, the CC duty cycle is set to 50/50, that is, the period of a mark and
a space is half the period of the 64 kHz clock (7.81 µs). In the ON position, the duty
cycle of the CC 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
Rocker 4 is OFF, Rocker 3 selects either an 8 kHz clock (Rocker 3 is OFF), or a CC
timing signal (Rocker 3 is ON). When Rocker 4 is ON, Rocker 3 selects either a
1.544 MHz clock (Rocker 3 is OFF), or a framed E1 timing signal (Rocker 3 is ON).
Rockers 5 and 6 are not used.
Setting Switch Block S2
S2 is located approximately in the center of the module (see
of rocker switches controls the T1 and E1 frame generators, allowing you to
customize some of these outputs. Features such as framing formats and error
messages can be enabled, disabled or changed, depending upon the application.
Table 6-16 summarizes the functions controlled by S2.
Table 6-16. 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
frame generator. Rocker 4 is not used.
Rocker 1 controls the CRC4 function of the E1 frame generator. When this switch is
in the OFF position, CRC4 coding is enabled. In the ON position, CRC4 coding is
disabled. Set this switch appropriately for the equipment receiving this signal.
12778474-002-2 Revision F – March 2004
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6-15, four signals are available for output through this port. When
Function
CPU, Frame Generator, and Clock Modules
T1/E1 Frame Generator Module with SSM
Figure
Off On
Enabled Disabled
CCS CAS
HDB3 AMI
ESF D4
Enable Disable
TSG-3800 User's Guide 191
6-8). This block