Zhone IMACS Hardware FAQ
1. What is the distance on DS0-DP card?
DS0DP=500', G.703=50'
2. Does FXS/FXO support caller ID display feature from switch?
For the FXS cards - always. For the FXO cards - it's new and available with Software Release 3.7 (OHD)
3. Can Zhone make some recommendations on the maximum loop length that can be supported by the FXS card using 0.4mm and 0.5mm wire?
The maximum loop length is normally given in ohms. For the FXS card the value is 1800 ohms. So, the conversion process is .4 mm = 26 gauge wire. 26-gauge wire has a resistance of 428 ohms per mile. Therefore, the distance is 1800/428 = 4.2 miles, or 6.76 kilometers. For the .5 mm wire = 24 gauge wire, 24-gauge wire has a resistance of 265.5 ohms per mile. The distance is 1800/265.5 = 6.7 miles or 10.9 kilometers.
4. How far can the FXS card provide current for?
The FXS has a jumper for short loops and long loops. The loop resistance for short loop is a minimum of 300 ohms, and a maximum of 700 ohms. The loop resistance for long loops is a minimum 300 ohms and a maximum 1800 ohms. If you take 1800 ohms and 26-gauge cable, you get a distance of 6.7 km. (assuming 26 AWG, resistance of 428 ohms/mile, and 1.6 km per mile). FXO/FXS return loss for ERL and SRL ---- >= 28dB
5. What are the IMAC's system capacities?
There are several factors regarding capacities on the IMAC's, all of which should be considered when configuring an IMAC's multiplexer. The three main configuration limitation issues are:
- 8 user card slots
- 126 back plane DS0 busses
- User cards assign to specific busses
The main issue here is the back plane bus assignments; There are four back plane busses called the A, B, C, and D bus. All busses will carry 32 DS0 assignment, except the "A" bus, which will carry 30 ( 2 busses carry system information). So there are 126 possible bus assignments. The back plane busses are used to assign DS0's to user cards of which there are 8 slots. DS0 to DS0 cross connects do not use bus assignments, so the only limit to cross connects is the amount of DS0's available.
All Voice cards (FXS, FXO, and E&M cards) are 8 port cards, and there are 8 user card slots for a total of 64 ports. 1 DS0 for each port, 64 voice paths... Almost. Voice cards will only assign to the A&B busses; the A bus only has 30 usable busses, so 62 voice drop offs per chassis.
The 8220xx SRU card has the same bus issue as the voice cards Ö A&B bus only, so if you are loading a system up with SRU cards, mix in some 8221xx SRU cards. They assign to the C&D bus; you will run out of user ports before you will back plane busses.
When assigning DS0's to HSU cards, watch your back plane assignments. DS0's assigned to HSU cards must all be carried on the same bus, so when assigning super rate data assignment, usually you want to assign the ports with the higher rates first. Then, the lower rates will fill in the leftover spaces on the busses. Just remember, you can do 4 ports of 24x64kbs super rate data and still have 30 back plane assignments left, but there will be 6 on the A bus and 8 on the B,C, and D busses, and, due to the no cross bus rule, you could not add a 5th full T1's worth of data to a single port. You could, however, add many more ports of 2x64kbs or 4x64bps, or even 3 8x64kbs.
Some cards, like the HSU's, assign to the C & D bus first, then the A & B.
This covers the main back plane bus assignment issues, but others may occur. This document is only intended to highlight key points that may be considered on larger systems.
Some of the card primary bus assignments are:
A & B BUS Primary
8119xx, 8129xx, 8139xx (voice), 8212xx HSU, 8220xx, 8230xx, 8228xx, 8249xx, 8231xx
C&D BUS Primary
8202xx, 8215xx, 8214xx, 8203xx, 8247xx, 8248xx, 8260xx, 8261xx, 8262xx, 8221xx
6. Do the alarm cards 8401 & 8402 require a 48 VDC power source when used in an IMACS?
Neither card requires a 48 VDC power source, unless input sensors are to be used.
7. Do I need a power converter for my Ring Generator(s) with a 8902 48 VDC power supply?
No you don't need a converter. All you need is the Ring Generator(s).
8. What power supply requires a converter with the Ring Generators?
901 AC power supply.
8901 Main power supply for AC-powered IMACS units. 120/240VAC, 50 - 60Hz input provides +5V and +12V. It can be used with 8903 Power Converter to provide -48VDC from 120VAC only.
It can be used with 8905 Universal Power Converter to provide -48VDC from either 120VAC or 240VAC. A second 8901 may be installed for load sharing/redundancy. AC Power Supply, 120/240VAC.
9. What converters could I use with the 8901 power Supply?
A 8903 Power Converter to provide -48VDC from 120VAC only. A 8905 Universal Power Converter to provide -48VDC, from either 120VAC or 240VAC. A second 8901 may be installed for load sharing/redundancy. AC Power Supply, 120/240VAC
10. What is a “Ring Generator"?
A Ring Generator is used to supply ringing current for all FXS cards and for FXO cards in Manual Ring Down applications. It provides control of In-rush current during startup and hot insertion. Ring Generator, -48VDC.
11. What are the pinouts to the PM-IOR Card terminal Cable?
PM-IOR Card to DB-25 Terminal Cable Pinouts
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PM-IOR Port
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PC or Terminal Serial Port
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CO
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RJ-45
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DB-25
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1
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5
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2
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8
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3
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3
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4
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Not Connected
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5
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7
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6
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2
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7
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20
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8
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4
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12. What are the pin outs for the IMACS terminal cable?
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DB-25 pins to terminals
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RM-48 Male pins to interface card
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2
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6 transmit
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3
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5 receive
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7
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4 ground
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13. What are DTMF pairs?
Dual-tone multi-frequency (TOUCHTONE dialing as opposed to dial pulse rotary dial) uses two frequencies from two sets of four groups. With DTMF, each key you press on your phone generates two tones of specific frequencies. The chart below shows the combinations:
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Low Group
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High Group
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(Hz)
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1209
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1336
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1447
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1633
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697
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1
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2
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3
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4
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770
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4
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5
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6
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B
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852
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7
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8
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9
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C
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941
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*
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0
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#
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D
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14. Are all IMACS chassis suitable for us in Europe?
No. 8916 Rev A1 not for use in Europe (E1). Also, in general all 4-digit Rev A1's are not.
15. What ground points should be connected together when installing an IMACS chassis.
None. All are separate and distinct grounds.
16. How do I change the WAN card from T1/DSX to E1/CEPT?
Both 801060 (Dual T1/E1 WAN card) and 800060 (Single T1/E1 WAN card) support T1 and E1. The plug-in Line Interface Module (8110) is changeable between T1 and E1. If you want to change the WAN card from T1 to E1, unplug the plug-in module and change the jumper accordingly. The jumper option configuration is shown on the card itself.
17. What is the functionality of the COMP port on the interface card?
COMP port on the interface card is RS232 computer port. It connects a local device for reporting or printing alarms. Since it only transmits, it does not function as control terminal port (craft port), which you can connect to a PC or an external modem.
18. How do I change 8215 HSU card from 530 to V.35?
An 8215 HSU card supports both 530 and V.35. You can choose either one by switching the black switch (in the middle of the board) to 530 or V.35.
19. What kind of V.35 cable should I use to connect to HSU card?
There are two different versions of HSU cards. One comes with 4 DB26 ports (8215 and 8216). Another comes with 2 DB25 ports (8202, 8203, 8212, 8213 and 8214). 1263F cable is needed to connect V.35 DTE to 8215 HSU card. 1260F cable is used to connect V.35 DTE to 8214 HSU.
20. Can I use the FXS card to simulate E&M circuit?
Yes, you need specify FXS mode as FSXDN under FXS-> Mode.
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