PA-MC-E3 PA in 7204VXR

eddystacey · ‎06-03-2005

I want to use the BT Megastream 34 Aggregate service at a central site to support multiple remote site locations of varying circuit bandwidths i.e. multiple 256Kbps circuits, multiple 384Kbps bandwidths and multiple 512Kbps bandwidths. The central site router will be a Cisco7204VXR with a 1 port Multi-Channel E3 port adapter (PA-MC-E3).

1) Has anyone deployed a similar solution?

2) Can the Megastream 34 service be channelized?

3) Are there any restrictions or issues to be aware of?

4) Do the channelized interfaces support enhaced IOS features e.g. QoS, compression etc

Many thanks,

Ed

jhalldn · ‎06-04-2005

Hi,

cant answer all, because i dont get it all in your solution, but some issues maybe can help.

Make sure that BT delivers an E3 MUX-invert solution for your MC-E3. The MC-E3 needs to talk to the SDH element to make sure to deliver multiples of E1. every E1 config in your router cant be split in timeslots of 64 kbps. Depending of what service BT delivers, multiples of 64k needs to get muxed in SDH cloud from your satellites. The remote sites needs some router with serial with DCE or E1 interfaces.

Every logic interface supports the same stuff as physical ones.

eddystacey · ‎06-06-2005

Hi,

Many thanks for your reply - very much appreciated.

I just wanted to check on a few things. You say that every E1 config in the router CANT be split in timeslots of 64Kbps.

I understand that the number of sites that can be supported by each multichannel E3 port adapter (PA-MC-E3) is directly dependant on the circuit bandwidths allocated to each remote site connection; based around the 128 channels supported by the PA-MC-E3 - as an example where all remote sites connect via:

• 512Kbps circuits – 16 sites can be supported by each multichannel E3 port adapter (PA-MC-E3).(512/64 = 8 128/8 = 16

• 384Kbps circuits – 21 sites can be supported by each multichannel E3 port adapter (PA-MC-E3).(384/64 = 6 128/6 = 21)

• 256Kbps circuits – 32 sites can be supported by each multichannel E3 port adapter (PA-MC-E3). (256/64 = 4 128/4 = 32)

1) Have I understood this correctly?

2) Do you know if there is a restriction on the number of circuits supported through the BT service?

3) The remote site routers will be 2801's with a WIC-1T interface.

Many thanks again.

jhalldn · ‎06-30-2005

Hi, maybe im lost :-)

Dont know much about BT services, but in teory this maybe helps?

--snipet--

The E3 interface on the PA-MC-E3 carries 16 E1 links which are combined in one E3 link. Each E1 link can be configured for channelized, unchannelized (also called unframed), or ISDN PRI operation.

The 16 E1 lines (1-16) have four configuration options:

1) Channelized E1: Any of the 16 E1 lines can be configured as channelized E1 lines (limited to 128 logical channels). You can group the time slots in these E1 lines into several individual logical channel groups, each of which carries data with different data link layer protocol encapsulations. You can configure timeslot 16 as a data channel, although it is typically used for common channel signaling. (Channel associated signaling (CAS) for voice channels and E1 Facilities Data Link [FDL] on timeslot 16 are not supported.)

2) Each logical channel group can be composed of individual 64-kbps timeslots and/or ranges of timeslots, for example, 1,9,12-14. Each logical channel group can contain from 1-31 timeslots maximum; the same timeslot cannot be used in more than one logical channel group. Any unused timeslots are filled with programmable idle-channel data.

3) PRI ISDN E1Any of the E1 lines can be configured to support the PRI ISDN application. You assign a PRI group to the E1 line. Each PRI group can contain from 1-31 timeslots maximum. It is not necessary to allocate all 30 timeslots for the ISDN application. Timeslot 16 is used for common channel signaling. Any unused timeslot are filled with programmable idle-channel data.

4) Fractional E1: Any of the 16 E1 lines can be configured as fractional E1 lines, each of which can be either E1 frames or E1 cyclic redundancy check (CRC) multiframes, as specified by CCITT/ITU G.704 and G.706. A fractional E1 line is a subset of the full E1 bandwidth, which uses n x 64 kbps; where n is a timeslot in the range of 1-31.

Fractional E1 lines contain only a single logical channel group that can be either a single 64-kbps timeslot or a range of timeslots; for example timeslot 1, or timeslots 15-23. Any unused timeslots are filled with programmable idle-channel data.

--end--

Chears;