FiberPlex TIS-8632 - Manual (Page 13)

Page 11
Additional Information
Bonding Units
Two TIS‐8632 can be bonded together locally to make the equivalent of an 8 Copper x 2 fiber switch by using
an SFP Passive Cable Assembly like the FiberPlex FC‐QDAXX1‐0‐0.5M. These passive cables are terminated
with SFP compatible connectors and are considerably cheaper than using a pair of optical modules with a fiber
jumper. The cables are only useful for short connections.
In this configuration, one SFP port on each TIS‐8632 is occupied by the Passive Cable Assembly leaving one SFP
port on each TIS‐8632 that can still be utilized for optical modules. This also results in 8 local 10/100/1000
copper ports.
Figure 6 Representative Drawing of an SFP Passive Cable Assembly
SFP MSA Compliance
The SFP Multisource Agreement (MSA) is an agreement that was drafted among competing manufacturers of
SFP optical modules. The SFF Committee was formed to oversee the creation and maintenance of these
agreements including the SFP MSA designated as INF‐8074i. This agreement describes a mutually agreed upon
standard for the form and function of SFP modules. However, not all SFPs produced are MSA compliant. The
MSA provides for a transceiver (TX/RX) pinout. Other industries such as broadcast had the need for dual TX
and dual RX SFP for uni‐directional applications such as video. Naturally, a non‐MSA standard was introduced
allocating pinout assignments for dual output and dual input I/O configurations. In addition, the some of the
internal serial communication pins were reassigned.
The TIS‐8632 will only accept MSA compliant SFP modules which support a 1.25 Gbps data rate.
Pinout Comparison Chart
PIN Transceiver (MSA) Transceiver (Non‐MSA) Dual TX (Non‐MSA) Dual RX (Non‐MSA)
1 VEE VEE VEE VEE
2 TX_FAULT [VEE] VEE NC Rx2‐
3 TX_DIS NC NC Rx2+
4 MOD_DEF(2) ‐ SDA VEE VEE VEE
5 MOD_DEF(1) ‐ SCL SCL SCL SCL
6 MOD_DEF(0) – PRESENCE [VEE] SDA SDA SDA
7 Rate [NC] VEE VEE VEE
8 LOS RX1_LOS Tx2+ NC
9 VEE NC Tx2‐ NC
10 VEE NC Tx2_DIS NC
11 VEE VEE VEE VEE
12 RD‐ Rx1‐ NC Rx1‐
13 RD+ Rx1+ NC Rx1+
14 VEE VEE VEE VEE
15 VCC VCC VCC VCC
16 VCC VCC VCC VCC
17 VEE VEE VEE VEE
18 TD+ Tx1+ Tx1+ NC
19 TD‐ Tx1‐ Tx1‐ NC
20 VEE Tx1_DIS Tx1_DIS NC