It is not impossible to design a cage that would accept both modules. Additionally, we do not know what happens in terms of optical module design in the future and a brand new format could be designed to accommodate multi-rate optics for NG-EPON. I would not discard the general notion that Glen presented on the grounds of today's availability of optical modules and existing designs.Another point to make, something that I forgot to mention on the call, is that from an operator's perspective, replacement of the whole ONU and replacement of an optical module are very similar in terms of the end expense - expenses related with the truck roll, customer outage, scheduling, etc. are typically much higher than the cost of new equipment.RegardsMarekOn Tue, Jun 28, 2016 at 6:29 AM, Liudekun <liudekun@xxxxxxxxxx> wrote:Dear Glen:
I didn’t attend the last telephone meeting due to I was in another meeting (the time is also difficult for me usually), I have a question on your contributions when I review them.
In the two contributions, there are several places mention the upgrade by “replacing the optical module” (such as from 25G OLT to 100G OLT)
Have you made an assumption that the 25Gb/s optical modules are with the same size and PINs layout with that of 50Gb/s and 100G optical modules ?
Only with this precondition, a 25G module is able to be replaced by a 100G module. But at the most probable case, 100G module should have more PINs than 25G, the size of 100G will also be larger than 25G.
If without this assumption, then upgrade by “ replacing optical module” will be not feasible.
I wonder if my understanding is correct.
Best regards
Dekun Liu
____________________________________________________
Advanced Access Technologies Dept. 网络研究接入技术部
Huawei Technologies Co., Ltd. 华为技术有限公司
Phone: +86 027-59267217 Email: liudekun@xxxxxxxxxx湖北武汉市关山一路光谷软件园A7-9 邮编：430074
Huawei Technologies Co., Ltd.A7-9 Wuhan Optical Valley Software Park,Guan Shan Road,Wuhan,Hubei, P.R.China
From: Glen Kramer [mailto:000006d1020766de-dmarc-request@xxxxxxxx]
Sent: Thursday, June 23, 2016 6:29 AM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGEPON] Presentations for the call tomorow
All,
At some point during the last meeting, the conversation turned to whether a 100G device (OLT or ONU) with some channels disabled was still a 100G device or a 25G/50G device and whether such device would satisfy our objectives. I remember Frank's remark that we need to have a discussion on the 100G-EPON nomenclature. The first attached presentation (kramer_3ca_1_0616_configurations_2.pdf) is an attempt to start this discussion.
The second presentation (kramer_3ca_1_0616_upgrades.pdf) looks at various OLT and ONU upgrade scenarios and tries to answer a question whether keeping 25G line card and adding a separate 50G/100G line card is better or worse than just replacing the 25G line card with 50G/100G line card.
Looking forward to our call tomorrow.
Glen
