Functional
Overview
ST112 SONET Transmission Test Set
2–17
The
Orderwire Handset
port provides handset access to the local (section) or express (line)
ORDERWIRE channel in the selected STS-n, setup dependent.
The
DCC (Data Communications Channel)
connector is a 15-pin DB socket that can be used
with a protocol analyzer or related test set to access V.11 compatible data and clock signals.
External data can be carried by the section DCC (D1 to D3 bytes) at a 192 Kb/s rate or the line
DCC (bytes D4 to D12) at a 576 Kb/s rate. In each case the Test Set supplies a smooth clock
source at the appropriate rate and expects a return data bit within 500 ns after each rising edge of
the clock. The pin numbers and functions are listed in Table 2–1. Figure 2–12 shows the transmit
data input pins 2 and 9. They are differentially terminated with a 100 ohm input impedance. All
other signals are high impedance differential outputs. Pins 1 and 8 are signal ground.
Table 2–1 Data Communications Channel (DCC) Pinouts
Pin
Function
Pin
Function
7
Transmit Clock (True)
6
Receiver Clock (True)
14
Transmit Clock (Compliment)
13
Receiver Clock (Compliment)
2
Transmit Data (True)
4
Receiver Data (True)
9
Transmit Data (Compliment)
11
Receiver Data (Compliment)
1
Ground
8
Ground
Figure 2–12 I/O Circuit Logic
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