
7
20-Pin SCA-2 Host Connector Characteristics
Table 1. SCA-2 Host connector pin assignment
Notes:
A sequence value of 1 indicates that the signal is in the first group to engage during plugging of a module. A sequence value of 2 indicates that
the signal is the second and last group. The two guide pins integrated on the connector are connected to TGND. These two guide pins make
contact with circuit ground prior to Sequence 1 signals.
* This pin is tied high via 10 K pull-up resistor.
Table 2. Signal Definition
Table 3. Module Definition
Note: All Agilent GBIC modules comply with Module Definition 4 of the GBIC specification Rev 5.4
Pin Name Sequence Pin Name Sequence
1RX_LOS211RGND1
2 RGND 2 12 -RX_DAT 1
3 RGND 2 13 +RX_DAT 1
4MOD_DEF(0)214RGND1
5MOD_DEF(1)215VDDR2
6MOD_DEF(2)216VDDT2
7 TX_DISABLE* 2 17 TGND 1
8TGND218+TX_DAT1
9 TGND 2 19 -TX_DAT 1
10 TX_FAULT 2 20 TGND 1
Pin Signal Name Input/Output Description
1 RX_LOS Output Receiver Loss of Signal, TTL High, open collector
2 RGND Receiver Ground
3 RGND Receiver Ground
4 MOD_DEF(0) Output TTL Low
5 MOD_DEF(1) Input SCL Serial Clock Signal
6 MOD_DEF(2) Input/Output SDA Serial Data Signal
7 TX_DISABLE Input Transmit Disable
8 TGND Transmitter Ground
9 TGND Transmitter Ground
10 TX_FAULT Output Transmit Fault
11 RGND Receiver Ground
12 -RX_DAT Output Received Data, Differential PECL, ac coupled
13 +RX_DAT Output Received Data, Differential PECL, ac coupled
14 RGND Receiver Ground
15 VDDR Input Receiver +5 V supply
16 VDDT Input Transmitter +5 V supply
17 TGND Transmitter Ground
18 +TX_DAT Input Transmit Data, Differential PECL, ac coupled
19 -TX_DAT Input Transmit Data, Differential PECL, ac coupled
20 TGND Transmitter Ground
Defntn. MOD_DEF(0) Pin 4 MOD_DEF(1) Pin 5 MOD_DEF(2) Pin 6 Interpretation by host
4 TTL Low SCL SDA Serial module definition protocol
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